Clearer plans. Better conversations.
Find the meaning behind the shorthand—from the first bid to the final walkthrough.
FROM PLAN TO PROJECT
One reference. Every stage of the job.
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BIM & digital coordination · Acronym or initialism · Industry-wide — A model use that links three-dimensional project information with schedule or time information.
In practice: The team uses a 4D sequence to review crane access by phase.
4D is a model-use label, not a guarantee of schedule accuracy.
BIM & digital coordination · Acronym or initialism · Industry-wide — A common model-use label connecting modeled quantities and project information with cost information.
In practice: The estimator links model quantities to cost data for a 5D review.
The meaning and integration scope should be defined in the BEP.
Project team & organizations · Acronym or initialism · Industry-wide — A collective reference to architectural and engineering professionals or their services.
In practice: The agency selects an A/E firm for design services.
Often written AE in procurement documents.
Concrete & masonry · Acronym or initialism · Industry-wide — A lightweight cellular concrete product cured under heat and pressure.
In practice: The enclosure design uses AAC wall panels.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — Traffic volume averaged across all days of a year at a specified location.
In practice: The engineer uses AADT with vehicle classification data.
Project team & organizations · Organization · U.S. specific — An organization representing state transportation departments and publishing transportation standards and technical guidance.
In practice: The bridge specification identifies an AASHTO document and edition.
Use the edition incorporated into the project's governing requirements.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A connected system of materials intended to control air leakage through the enclosure.
In practice: The enclosure review checks AB continuity at the roof-wall joint.
AB may mean anchor bolt in structural notes.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A bolt used to connect a component to concrete, masonry, or another supporting material.
In practice: The base plate detail locates each AB.
The specification may use anchor rod; verify type, embedment, and design requirements.
Codes & accessibility · Code, standard or program · U.S. specific — A U.S. law addressing accessibility of specified federally funded facilities.
In practice: The federal project identifies the applicable ABA accessibility standards.
Project team & organizations · Organization · U.S. specific — A U.S. construction trade association associated with merit shop construction.
In practice: The contractor checks ABC workforce development resources.
Electrical & fire protection · Acronym or initialism · Industry-wide — Electric current that periodically reverses direction.
In practice: The motor nameplate identifies its AC supply requirements.
AC on a mechanical drawing can mean air conditioning.
Electrical & fire protection · Acronym or initialism · Industry-wide — The process or equipment used to control indoor air conditions, commonly cooling and dehumidification.
In practice: The mechanical schedule lists the AC equipment serving the room.
Estimating & project controls · Acronym or initialism · Industry-wide — The cost incurred for the work performed within the defined accounting scope.
In practice: The cost report compares AC with EV.
AC also means alternating current or air conditioning.
Mechanical & HVAC · Acronym or initialism · Industry-wide — The airflow through a space expressed as multiples of its volume per hour.
In practice: The engineer calculates ACH from the specified airflow and room volume.
Identify whether the value refers to total, outdoor, or equivalent clean airflow.
Project team & organizations · Organization · U.S. specific — An organization developing concrete knowledge, standards, and certification programs.
In practice: The specification identifies an ACI standard and edition.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A ceiling panel product used as part of an acoustical ceiling system.
In practice: The RCP shows a suspended ACT grid.
Some schedules use ACT for acoustical ceiling treatment; check the legend.
Codes & accessibility · Code, standard or program · U.S. specific — A U.S. civil rights law that includes accessibility requirements affecting covered facilities.
In practice: The designer reviews ADA requirements alongside the building code.
Code compliance and ADA compliance are related but distinct inquiries.
Codes & accessibility · Code, standard or program · U.S. specific — Accessibility guidelines that form part of the background to applicable federal accessibility standards.
In practice: An older specification references ADAAG terminology.
Use the applicable enforceable standards for the facility and project.
Safety & occupational health · Acronym or initialism · Industry-wide — A device that analyzes heart rhythm and can deliver a shock when indicated.
In practice: The emergency plan identifies the AED location.
Electrical & fire protection · Acronym or initialism · Industry-wide — A protective device intended to detect specified hazardous arcing conditions and interrupt the circuit.
In practice: The dwelling circuit schedule identifies AFCI protection.
AFCI and GFCI address different hazards.
Drawings & specifications · Drawing abbreviation · Industry-wide — A vertical dimension measured upward from the completed floor surface.
In practice: A device mounting note calls for 48 inches AFF.
Check which finished floor level applies; it is not automatically the structural slab elevation.
Drawings & specifications · Drawing abbreviation · Industry-wide — A height measured from the completed exterior ground level.
In practice: The outlet mounting height is specified AFG.
Project team & organizations · Organization · U.S. specific — A U.S. construction trade association representing general contractors and related firms.
In practice: The company uses AGC training resources for project staff.
Safety & occupational health · Acronym or initialism · Industry-wide — A documented analysis of hazards and controls for an activity, commonly used on USACE projects.
In practice: The team prepares an AHA for the planned excavation activity.
Use the contract's required process and acceptance requirements.
Project team & organizations · Organization · U.S. specific — The organization, office, or individual empowered to administer or enforce applicable requirements.
In practice: The team confirms the inspection sequence with the AHJ.
More than one AHJ may be involved in a project.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Equipment that moves and conditions air using components such as fans, filters, and coils.
In practice: The AHU schedule lists airflow and coil capacities.
A unit may perform several functions; check its schedule.
Project team & organizations · Organization · U.S. specific — A professional organization for architects in the United States.
In practice: The specification cites an AIA contract document by number and edition.
Electrical & fire protection · Acronym or initialism · Industry-wide — Common industry shorthand for a protective device's interrupting rating under specified conditions.
In practice: The panel submittal lists the circuit breaker's AIC rating.
Use the manufacturer's actual interrupting rating and voltage basis.
Project team & organizations · Organization · U.S. specific — An organization developing structural steel standards and technical resources.
In practice: The structural notes reference an AISC specification.
Drawings & specifications · Drawing abbreviation · Industry-wide — An identified alternative scope, material, or bid item for consideration.
In practice: The bid form asks for an ALT price for a different roof system.
Alternates require explicit acceptance according to the procurement documents.
Project team & organizations · Organization · U.S. specific — An organization coordinating the U.S. voluntary standards and conformity-assessment system.
In practice: The equipment specification calls for a named ANSI-approved standard.
Project team & organizations · Acronym or initialism · Industry-wide — The architect responsible for architectural documents and services within the assigned scope.
In practice: The AOR coordinates the permit drawing revision.
Role allocation can differ on projects with separate design and record architects.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — An industry organization providing engineered wood product certification and technical guidance.
In practice: The inspector checks the APA panel mark.
APA is the organization's current name, not a direction to expand an obsolete name.
Safety & occupational health · Acronym or initialism · Industry-wide — The expected level of respiratory protection from a properly functioning respirator class used within an effective program.
In practice: The respiratory program uses the applicable APF when selecting equipment.
APF is not a guarantee for an improperly fitted or used respirator.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A polymer used to modify bitumen in some roofing membranes.
In practice: The roof replacement specification calls for an APP-modified system.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — An AISC design method comparing required strength with nominal strength divided by a safety factor.
In practice: The steel calculation identifies ASD load combinations and capacities.
Older and other-discipline documents may use ASD for allowable stress design.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — A design approach checking calculated stresses against allowable values.
In practice: An older design report labels its method ASD.
In current AISC terminology, ASD means allowable strength design.
Project team & organizations · Organization · U.S. specific — A professional society developing building-services technical guidance and standards, branded ASHRAE.
In practice: The mechanical design criteria identify an ASHRAE standard.
Project delivery & contracts · Acronym or initialism · Industry-wide — Written clarification or instruction from the architect, commonly used for minor changes without changing contract sum or time.
In practice: An ASI clarifies a finish transition detail.
If an instruction affects cost or time, use the applicable change procedure.
Project team & organizations · Organization · U.S. specific — A standards organization publishing test methods and material specifications used in construction.
In practice: The concrete specification cites the applicable ASTM test method.
The current organization name is ASTM International; the older expanded name remains common in legacy documents.
Electrical & fire protection · Acronym or initialism · Industry-wide — A device that transfers a load between power sources under defined automatic controls.
In practice: The standby system uses an ATS to transfer selected loads.
Electrical & fire protection · Acronym or initialism · Industry-wide — A sizing system for electrical conductors.
In practice: The conductor schedule lists the required AWG size.
Safety & occupational health · Acronym or initialism · Industry-wide — A commonly used term for elevated work platforms, often appearing in older equipment terminology.
In practice: The rental quote describes the unit as an AWP.
Project team & organizations · Organization · U.S. specific — An organization producing welding standards, training, and certification programs.
In practice: The project identifies an AWS welding code in the specifications.
Estimating & project controls · Acronym or initialism · Industry-wide — The total authorized budget for the defined earned-value scope.
In practice: The baseline sets BAC before reporting performance.
Mechanical & HVAC · Acronym or initialism · Industry-wide — A communications protocol standard used for interoperable building automation data exchange.
In practice: The controls specification calls for BACnet communication.
Protocol support alone does not guarantee every required integration function.
Mechanical & HVAC · Acronym or initialism · Industry-wide — A system monitoring and controlling building equipment and operating sequences.
In practice: The BAS trends fan status and space temperatures.
Drawings & specifications · Drawing abbreviation · Industry-wide — The elevation at the lower curb reference identified in the civil legend.
In practice: The grader compares BC and TOC elevations.
Some drawings use BC for back of curb or base cabinet; follow the project legend.
BIM & digital coordination · Acronym or initialism · Industry-wide — An open format for exchanging model-related issues and viewpoints among applications.
In practice: The coordinator sends clash comments as BCF issues.
Civil, survey & earthwork · Unit or symbol · Industry-wide — A cubic yard of material measured in its original, undisturbed ground condition.
In practice: The excavation estimate reports quantities in BCY.
Do not equate bank, loose, and compacted volumes without appropriate factors.
BIM & digital coordination · Acronym or initialism · Industry-wide — A plan defining model uses, responsibilities, exchanges, and coordination procedures.
In practice: The team agrees on the BEP before model development.
AIA documents may use BIM execution plan without the BEP acronym.
Plumbing & utilities · Acronym or initialism · Industry-wide — A device or assembly intended to prevent reverse flow into a protected water supply.
In practice: The site detail identifies the BFP assembly.
Device selection depends on hazard classification and local requirements.
BIM & digital coordination · Acronym or initialism · Industry-wide — A process using coordinated digital information and models to support building delivery and operation.
In practice: The BIM team coordinates structural and MEP systems before installation.
The term can also refer to building information models; the delivery requirements define the actual scope.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A survey reference point with an established elevation.
In practice: The surveyor ties layout elevations to the designated BM.
BM can mean beam in structural drawing legends.
Environment & sustainability · Acronym or initialism · Industry-wide — A structural measure or operating practice used to prevent or reduce pollution.
In practice: The erosion-control plan identifies a stabilized entrance as a BMP.
Mechanical & HVAC · Acronym or initialism · Industry-wide — A supervisory system used to manage building services, often overlapping with BAS terminology.
In practice: The owner reviews alarms through the BMS interface.
The project's naming convention and integration scope determine the distinction.
Drawings & specifications · Drawing abbreviation · Industry-wide — An elevation or position prefix referring to the underside of a named element.
In practice: A section labels the BO beam elevation.
The object following BO is essential to interpretation.
Design phases & commissioning · Acronym or initialism · Industry-wide — The design team's explanation of technical approaches and assumptions used to satisfy project requirements.
In practice: The engineer documents system selection in the BOD.
BOD is a design rationale; the OPR expresses what the owner needs.
Estimating & project controls · Acronym or initialism · Industry-wide — An itemized document listing measured work quantities for pricing or administration.
In practice: The bidder prices each item in the BOQ.
Usage varies; U.S. projects may use bid schedules or other quantity formats.
Drawings & specifications · Drawing abbreviation · Industry-wide — The elevation at the bottom surface of a structural steel member.
In practice: The coordinator compares BOS with the duct clearance.
Units & measurements · Unit or symbol · Industry-wide — A customary heat-energy unit used in U.S. mechanical work.
In practice: The energy report expresses a heat quantity in BTU.
Heating and cooling capacity requires an energy-per-time unit.
Units & measurements · Unit or symbol · Industry-wide — A rate of heat transfer commonly used for heating or cooling capacity.
In practice: The heater schedule lists its output in BTU/h.
Do not omit the time basis when comparing capacity.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A roof system assembled from multiple reinforcing plies and bituminous layers.
In practice: The roof survey identifies an existing BUR assembly.
System composition and repair compatibility vary.
Environment & sustainability · Acronym or initialism · Industry-wide — The construction and demolition activities or material stream described in a waste plan.
In practice: The waste log records C&D materials sent for recycling.
Diversion claims need a defined measurement and destination basis.
BIM & digital coordination · Acronym or initialism · Industry-wide — Software-supported preparation of drawings or digital design geometry.
In practice: The consultant issues CAD drawings under the project standards.
A CAD drawing is not necessarily an information-rich BIM model.
Quality & inspection · Acronym or initialism · Industry-wide — A request to investigate and correct a nonconformance and, when required, address its cause.
In practice: The quality manager opens a CAR after a recurring defect.
Some systems expand CAR as corrective action report.
Mechanical & HVAC · Acronym or initialism · Industry-wide — An air-distribution approach designed to maintain a substantially constant airflow in its operating mode.
In practice: The mechanical plan labels a CAV system serving the room.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — An agreement between an employer and a labor organization governing specified employment terms.
In practice: The payroll setup reflects the applicable CBA classifications and benefits.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A penetration-based index used to assess subgrade and aggregate support characteristics.
In practice: The pavement designer reviews soaked CBR results.
Project delivery & contracts · Acronym or initialism · Industry-wide — A contract instrument directing a change before the parties have fully agreed on its cost or time effects.
In practice: A CCD directs revised work while the adjustment is evaluated.
Authority and pricing procedures depend on the contract.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — A project insurance arrangement sponsored by a contractor for defined participants and coverage.
In practice: The trade contractor reviews the CCIP manual before enrollment.
The acronym does not specify every line of coverage.
Civil, survey & earthwork · Unit or symbol · Industry-wide — A cubic yard of material measured after compaction to the defined condition.
In practice: The fill estimate states the required CCY in place.
Design phases & commissioning · Acronym or initialism · Industry-wide — The drawings and specifications prepared to communicate requirements for construction and related approvals.
In practice: The team completes the CD package for the next issue.
Document status, completeness, and permitted use depend on the issue and contract.
BIM & digital coordination · Acronym or initialism · Industry-wide — An agreed source and process for collecting, managing, and sharing project information.
In practice: The team controls document status and access through the CDE.
A shared folder alone does not define a complete information-management process.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — Common trade shorthand for plywood with C and D veneer grades and a moisture-resistant glue bond.
In practice: The buyer checks the actual panel grade stamp against the CDX description.
CDX is shorthand, not a complete panel specification; Exposure 1 is not intended for permanent weather exposure.
Project delivery & contracts · Acronym or initialism · Industry-wide — A responsibility split assigning both supply and installation to the contractor.
In practice: The equipment matrix marks the exhaust fans CFCI.
Mechanical & HVAC · Unit or symbol · Industry-wide — A U.S. customary volumetric airflow rate.
In practice: The balancing report lists 300 CFM at the diffuser.
Air density and rating conditions matter for some comparisons.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — Steel members shaped at relatively low temperatures, commonly from sheet or strip.
In practice: The partition design uses CFS studs.
Cold-formed steel design follows the applicable member and system standards.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — A category of liability insurance addressing specified third-party claims subject to policy terms.
In practice: The subcontract requires CGL coverage with identified limits and endorsements.
Environment & sustainability · Acronym or initialism · Industry-wide — A general permit providing coverage for eligible construction stormwater discharges under stated conditions.
In practice: The operator checks the applicable CGP before submitting the NOI.
EPA and authorized states have different permits and coverage areas.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Water circulated to absorb heat in cooling coils or other cooling equipment.
In practice: The mechanical plan identifies CHW piping to the AHU.
Mechanical & HVAC · Acronym or initialism · Industry-wide — The chilled-water flow path returning water from the load toward the cooling source.
In practice: The coil detail identifies the CHWR connection.
Mechanical & HVAC · Acronym or initialism · Industry-wide — The chilled-water pipe or flow path delivering cooled water to the load.
In practice: The installer traces CHWS from the plant to the coil.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — Insulation extending across structural members with limited interruptions as defined by the governing criteria.
In practice: The wall section shows exterior CI outside the sheathing.
CI in plumbing schedules can instead mean cast iron.
Plumbing & utilities · Acronym or initialism · Industry-wide — An iron-based material commonly identified in drainage pipe schedules.
In practice: The plumbing specification calls for CI soil pipe.
CI means continuous insulation in enclosure discussions.
Concrete & masonry · Acronym or initialism · Industry-wide — Concrete placed in its final location at the project rather than delivered as a finished precast element.
In practice: The drawings call for a CIP retaining wall.
Also written cast in situ in some international documents.
Drawings & specifications · Drawing abbreviation · Industry-wide — A planned joint used to manage the location of cracking or movement.
In practice: The slab plan identifies CJ locations.
Some concrete documents use CJ for construction joint.
Drawings & specifications · Drawing abbreviation · Industry-wide — The interface between concrete placements made at different times.
In practice: The pour plan locates a CJ at the approved stopping point.
This is not automatically a contraction or control joint.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — A groove weld condition with weld metal extending through the joint thickness as specified.
In practice: The connection detail calls for a CJP groove weld.
Drawings & specifications · Drawing abbreviation · Industry-wide — A reference line through the middle of a feature used for layout or dimensioning.
In practice: The drawing dimensions the column CL from the grid.
The centerline symbol may appear instead of the letters.
Drawings & specifications · Drawing abbreviation · Industry-wide — The overhead interior finish surface or ceiling system.
In practice: The room finish schedule lists the CLG material.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — An engineered timber panel made from bonded layers with adjacent layers oriented across each other.
In practice: The floor assembly uses CLT panels.
Fire, acoustics, connections, and moisture protection require coordinated design.
Project team & organizations · Acronym or initialism · Industry-wide — A person or firm managing construction planning, coordination, cost, or delivery under a defined role.
In practice: The CM leads a coordination meeting with the owner.
A construction manager may act as adviser or hold construction risk.
Project delivery & contracts · Acronym or initialism · Industry-wide — A delivery method involving early contractor participation followed by negotiated construction work under program rules.
In practice: The highway agency uses CM/GC to plan staging before construction.
Public program details differ by agency.
Project delivery & contracts · Acronym or initialism · Industry-wide — A delivery approach where a construction manager provides preconstruction input and later assumes contractual construction responsibility.
In practice: The CMAR team helps develop trade packages before construction.
Also written CM at risk or CM/GC in some public programs.
Design phases & commissioning · Acronym or initialism · Industry-wide — Software used to manage assets, maintenance work orders, and related records.
In practice: The facilities team imports asset data into the CMMS.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — Metal drainage pipe formed with corrugations for stiffness.
In practice: The culvert schedule identifies an existing CMP.
Concrete & masonry · Acronym or initialism · Industry-wide — A manufactured concrete block used in masonry construction.
In practice: The wall schedule specifies reinforced CMU.
Unit dimensions, strength, grout, and reinforcement follow the specification.
Project delivery & contracts · Acronym or initialism · Industry-wide — A formal change to the construction contract that records agreed changes to work, price, or time.
In practice: The owner approves a CO for an added entrance canopy.
Confirm approvals required by the actual contract; CO has other construction meanings.
Plumbing & utilities · Acronym or initialism · Industry-wide — An accessible fitting or opening allowing cleaning and inspection of drainage piping.
In practice: The floor plan locates a CO at the base of the stack.
The same letters also refer to contract changes and occupancy documents.
Codes & accessibility · Code, standard or program · U.S. specific — An official document authorizing occupancy or use under the issuing jurisdiction's process.
In practice: The owner coordinates final inspections before requesting the CO.
It is distinct from a contract change order and does not resolve every contractual closeout obligation.
Safety & occupational health · Chemical symbol · Industry-wide — A toxic, colorless, odorless gas produced by incomplete combustion and other processes.
In practice: The safety plan addresses CO from fuel-powered equipment in enclosed areas.
This chemical symbol is unrelated to change orders or occupancy certificates.
BIM & digital coordination · Acronym or initialism · Industry-wide — A structured information exchange for handing over asset data for operation and maintenance.
In practice: The owner requests COBie equipment data at handover.
The required fields and delivery format belong in the project requirements.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — A document summarizing information about insurance policies identified on it.
In practice: The owner requests a COI before site mobilization.
A certificate is not the policy and does not itself expand coverage.
Project delivery & contracts · Acronym or initialism · Industry-wide — A request asking for a change to contract scope, compensation, or schedule.
In practice: The subcontractor submits a COR with labor and material backup.
A request is not the same as an approved change.
Estimating & project controls · Acronym or initialism · Industry-wide — An earned-value ratio calculated as earned value divided by actual cost.
In practice: A CPI below 1 indicates more cost than earned value on that reporting basis.
The ratio is undefined when actual cost is zero; it is not a profit margin.
Estimating & project controls · Acronym or initialism · Industry-wide — A scheduling method using activity logic and durations to calculate timing and paths controlling completion.
In practice: The scheduler updates the CPM model after progress review.
The critical path can change as progress and logic change.
Safety & occupational health · Acronym or initialism · Industry-wide — Emergency measures used to support circulation and breathing in cardiac arrest.
In practice: The site identifies trained CPR responders and emergency contacts.
A definition does not substitute for recognized training.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — A payroll submission accompanied by the required certification under the applicable prevailing wage program.
In practice: The payroll team reconciles time records before submitting the CPR.
CPR in a safety context means cardiopulmonary resuscitation.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — An in-situ test measuring resistance as an instrumented cone is pushed into soil.
In practice: The geotechnical team uses CPT data to characterize subsurface layers.
Plumbing & utilities · Acronym or initialism · Industry-wide — A chlorinated thermoplastic used in specified piping systems.
In practice: The submittal identifies CPVC pipe and compatible fittings.
Temperature, pressure, listing, and chemical compatibility depend on the system.
Quality & inspection · Acronym or initialism · Industry-wide — The contractor's program for controlling the quality of its work under the contract.
In practice: The CQC manager documents required inspections and corrections.
USACE and other agencies may prescribe specific CQC processes.
Project team & organizations · Organization · U.S. specific — A professional organization associated with construction specifications and information standards.
In practice: The project manual organizes work using CSI-related classification conventions.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — A federal law addressing work hours, overtime, and safety on certain covered government contracts.
In practice: The contract review identifies applicable CWHSSA clauses.
Coverage and obligations depend on the contract and statute.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — An AWS certification designation for welding inspection personnel.
In practice: The quality plan identifies the assigned CWI.
Design phases & commissioning · Acronym or initialism · Industry-wide — A quality-focused process verifying and documenting that systems meet defined project requirements.
In practice: The Cx plan coordinates reviews, testing, training, and documentation.
Commissioning extends beyond equipment startup.
Design phases & commissioning · Acronym or initialism · Industry-wide — A commonly used title for the party leading the commissioning process.
In practice: The owner appoints the CxA early in design.
Some standards and contracts prefer commissioning provider; authority follows the contract.
Design phases & commissioning · Acronym or initialism · Industry-wide — The party providing the defined commissioning services.
In practice: The CxP maintains the issues log through functional testing.
The provider coordinates verification; it does not automatically replace designers or installers.
Units & measurements · Unit or symbol · Industry-wide — A U.S. customary unit of volume equal to 27 cubic feet.
In practice: The concrete takeoff reports quantities in CY.
Earthwork volumes need a bank, loose, or compacted condition.
Safety & occupational health · Acronym or initialism · Industry-wide — A recordkeeping category and related rate involving cases with days away, restricted work, or job transfer.
In practice: The safety report separates DART cases from all recordable cases.
DART rates typically use the 200,000-hour base; case counting follows recordkeeping rules.
Project delivery & contracts · Acronym or initialism · Industry-wide — A delivery approach in which one entity contracts with the owner for both design and construction.
In practice: The owner selects a DB team for the facility.
The allocation of design responsibility still depends on the contract.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — A federal law establishing prevailing wage requirements for covered federal construction contracts.
In practice: The payroll team checks the DBA clauses and applicable wage determination.
DBA also commonly means doing business as in business names.
Project delivery & contracts · Acronym or initialism · Industry-wide — A delivery approach in which design is completed for bidding and construction is separately procured.
In practice: The agency completes design before soliciting DBB construction bids.
Actual packages may be phased; check the procurement documents.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — The Davis-Bacon Act and related statutes extending prevailing wage requirements to covered federally assisted construction.
In practice: The contractor identifies DBRA obligations before assigning payroll classifications.
Electrical & fire protection · Acronym or initialism · Industry-wide — Electric current that flows in one direction.
In practice: The solar array produces DC before conversion by an inverter.
Mechanical & HVAC · Acronym or initialism · Industry-wide — The cold-water distribution system serving domestic plumbing uses.
In practice: The riser diagram labels the DCW main.
Design phases & commissioning · Acronym or initialism · Industry-wide — A design phase refining the selected concept, systems, materials, and coordination.
In practice: The DD review resolves major equipment and space requirements.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Control performed by programmable digital devices using measured inputs and control logic.
In practice: The DDC controller adjusts the heating valve.
Drawings & specifications · Drawing abbreviation · Industry-wide — An enlarged or focused drawing of a particular assembly or condition.
In practice: The plan points to DET 4 for the parapet connection.
Plumbing & utilities · Acronym or initialism · Industry-wide — A relative drainage loading unit assigned to plumbing fixtures under the applicable code.
In practice: The designer totals DFU values for a branch drain.
It is not a direct flow rate in gallons per minute.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Heated water provided for plumbing fixtures and domestic uses.
In practice: The DHW system serves lavatories and showers.
Drawings & specifications · Drawing abbreviation · Industry-wide — A stated measurement controlling the size or location of a feature.
In practice: The installer checks the written DIM before fabrication.
Plumbing & utilities · Acronym or initialism · Industry-wide — Pipe made from ductile iron, commonly used for buried water services and mains.
In practice: The utility drawing specifies DIP for the water main.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — The load from permanent components and other specified permanent items.
In practice: The structural design includes cladding weight in DL.
Mechanical & HVAC · Acronym or initialism · Industry-wide — A system dedicated to conditioning and delivering outdoor ventilation air.
In practice: The DOAS handles ventilation while local units handle zone loads.
Project team & organizations · Organization · U.S. specific — The federal department responsible for major labor and employment programs.
In practice: The payroll team reviews DOL guidance for a covered construction contract.
Project team & organizations · Organization · U.S. specific — A federal or state transportation department, depending on the document.
In practice: The plans use the state DOT's standard details.
Identify which department and jurisdiction the abbreviation denotes.
Drawings & specifications · Drawing abbreviation · Industry-wide — A project drawing or, in some digital contexts, a particular CAD file format.
In practice: The RFI references the relevant DWG and detail number.
Plumbing & utilities · Acronym or initialism · Industry-wide — The plumbing system that removes wastewater and provides required venting.
In practice: The plumber coordinates DWV stacks with structural openings.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Cooling in which refrigerant evaporates in a coil directly conditioning the air or other medium.
In practice: The AHU includes a DX cooling coil.
Drawings & specifications · Drawing abbreviation · Industry-wide — A count unit used for individual items in schedules and estimates.
In practice: The takeoff counts six access panels as EA.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Air discharged from a space or system to the outdoors or another designated discharge point.
In practice: The mechanical plan routes EA from the toilet room.
EA in a quantity schedule means each.
Estimating & project controls · Acronym or initialism · Industry-wide — The forecast total cost when the defined work is complete.
In practice: The PM updates EAC after reviewing remaining work.
Several forecasting methods exist; state the method and assumptions.
Safety & occupational health · Acronym or initialism · Industry-wide — A plan defining responsibilities and actions for workplace emergencies.
In practice: The orientation reviews the EAP and assembly locations.
Electrical & fire protection · Acronym or initialism · Industry-wide — The contractor responsible for the assigned electrical scope.
In practice: The EC coordinates feeder routing with the mechanical trade.
Drawings & specifications · Drawing abbreviation · Industry-wide — A note applying a reinforcement or other requirement to both faces of an element.
In practice: The wall note specifies vertical reinforcement EF.
EF can also mean exhaust fan on mechanical drawings.
Mechanical & HVAC · Acronym or initialism · Industry-wide — A fan serving an exhaust air system.
In practice: The roof plan locates EF-2 over the service area.
EF on reinforcement drawings often means each face.
Drawings & specifications · Drawing abbreviation · Industry-wide — The ground surface or elevation before the proposed work.
In practice: The section shows EG beneath the proposed embankment.
Electrical & fire protection · Acronym or initialism · Industry-wide — A conductive path connecting equipment metal parts into the grounding and bonding system.
In practice: The feeder detail identifies the EGC.
Do not confuse an EGC with a neutral conductor.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — An exterior wall cladding system combining insulation with reinforced base and finish coats.
In practice: The facade detail coordinates EIFS with flashings and drainage.
The complete approved assembly determines performance.
Drawings & specifications · Drawing abbreviation · Industry-wide — A joint intended to accommodate movement from temperature or other dimensional change.
In practice: The facade detail identifies a continuous EJ.
Joint design and sealant selection depend on the assembly.
Drawings & specifications · Drawing abbreviation · Industry-wide — A vertical level or an upright view of a building face, depending on context.
In practice: The section labels the landing EL beside the stair.
A number beside EL often indicates a level; a view title may indicate an elevation drawing.
Safety & occupational health · Acronym or initialism · Industry-wide — A workers' compensation insurance factor reflecting an employer's loss experience under the applicable rating system.
In practice: The bid submission requests the contractor's EMR documentation.
It is an insurance measure, not the same as an OSHA injury rate.
Electrical & fire protection · Acronym or initialism · Industry-wide — A thin-wall metal raceway for electrical conductors.
In practice: The electrical specification permits EMT in the designated interior area.
Project team & organizations · Acronym or initialism · Industry-wide — The engineer identified as responsible for the engineering design within the assigned scope.
In practice: The contractor forwards a structural design question to the EOR.
Estimating & project controls · Acronym or initialism · Industry-wide — An approved or requested adjustment to a contractual completion period.
In practice: The contractor submits an EOT request with supporting schedule analysis.
Entitlement and notice requirements depend on the contract.
Project team & organizations · Organization · U.S. specific — The federal agency administering major U.S. environmental programs.
In practice: The environmental lead identifies whether EPA or a state administers the permit.
Project delivery & contracts · Acronym or initialism · Industry-wide — A project delivery arrangement combining engineering, purchasing, and construction responsibilities.
In practice: An EPC contractor coordinates process equipment and field installation.
Environment & sustainability · Acronym or initialism · Industry-wide — A standardized declaration reporting environmental information for a product based on life-cycle assessment rules.
In practice: The submittal includes an EPD for the selected concrete mixture.
An EPD reports data; it does not by itself establish that a product is environmentally preferable.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A synthetic rubber used in roofing membranes, seals, and other building products.
In practice: The roof detail specifies an EPDM membrane.
Drawings & specifications · Drawing abbreviation · Industry-wide — A drawing instruction indicating equal dimensions, spacing, or distribution.
In practice: The ceiling plan marks three panel widths EQ.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Ventilation equipment exchanging sensible and latent energy between air streams under its design conditions.
In practice: The DOAS includes an ERV section.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A pavement design measure expressing traffic loading in terms of an equivalent reference axle.
In practice: The pavement study estimates ESAL demand over the design period.
Environment & sustainability · Acronym or initialism · Industry-wide — Measures that limit soil erosion and keep sediment from leaving disturbed areas.
In practice: The ESC inspection checks perimeter controls and exposed slopes.
Mechanical & HVAC · Acronym or initialism · Industry-wide — The static pressure available or required outside the equipment boundary defined by the rating or schedule.
In practice: The fan selection checks the scheduled ESP against duct losses.
Estimating & project controls · Acronym or initialism · Industry-wide — The forecast cost required to finish the remaining work.
In practice: The controls team revises ETC for the unawarded packages.
Estimating & project controls · Acronym or initialism · Industry-wide — The budgeted value of work actually completed under the measurement method.
In practice: The team calculates EV using accepted progress rules.
Earned value is not the same as money billed or revenue received.
Estimating & project controls · Acronym or initialism · Industry-wide — A method integrating scope, schedule, and cost using a defined performance baseline.
In practice: The project controls team compares earned value with cost and plan.
Electrical & fire protection · Acronym or initialism · Industry-wide — Equipment that delivers electrical energy to an electric vehicle and provides the specified control and protection functions.
In practice: The electrical design includes EVSE load and circuit information.
Drawings & specifications · Drawing abbreviation · Industry-wide — A note applying a reinforcement or spacing requirement in both directions.
In practice: The slab reinforcement is specified EW.
Concrete & masonry · Unit or symbol · Industry-wide — The concrete compressive strength required at the stated test age and under the specified test method.
In practice: The structural notes specify f'c for each concrete class.
The test age and acceptance criteria matter as much as the number.
Electrical & fire protection · Acronym or initialism · Industry-wide — The building system for detecting, notifying, and communicating specified fire or emergency conditions.
In practice: The FA drawings coordinate devices and pathways.
Electrical & fire protection · Acronym or initialism · Industry-wide — The control equipment receiving initiating signals and managing fire-alarm system outputs.
In practice: The riser diagram locates the FACP.
Codes & accessibility · Code, standard or program · U.S. specific — The principal regulation governing acquisition by U.S. federal executive agencies, with agency supplements and contract clauses where applicable.
In practice: The federal construction solicitation identifies relevant FAR clauses.
Check the actual solicitation, contract, and applicable agency supplement.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — An arc welding process using a tubular flux-filled electrode, with shielding determined by the process variant.
In practice: The fabricator selects the specified FCAW procedure.
Self-shielded and gas-shielded variants have different requirements.
Plumbing & utilities · Acronym or initialism · Industry-wide — A drainage cleanout accessed through the floor surface.
In practice: The finish plan coordinates access to the FCO.
Mechanical & HVAC · Acronym or initialism · Industry-wide — A local air-conditioning unit containing a fan and heating or cooling coil.
In practice: The room schedule identifies an FCU above the ceiling.
FCU can mean fixture connection unit in some plumbing legends; check context.
Plumbing & utilities · Acronym or initialism · Industry-wide — A plumbing fixture receiving drainage at the floor.
In practice: The mechanical room floor slopes toward the FD.
FD in an HVAC legend can mean fire damper.
Plumbing & utilities · Acronym or initialism · Industry-wide — A listed damper intended to restrict fire passage through an air-distribution opening under specified conditions.
In practice: The mechanical detail shows an FD at the rated wall penetration.
A fire damper and a floor drain are unrelated uses of FD.
Electrical & fire protection · Acronym or initialism · Industry-wide — A connection allowing the fire department to supply water to a fire-protection system.
In practice: The site plan preserves access to the FDC.
Drawings & specifications · Drawing abbreviation · Industry-wide — The completed walking surface, often used as a dimensional reference on drawings.
In practice: The section measures the sill height from FF.
FF also denotes floor flatness in concrete testing; read the legend.
Concrete & masonry · Acronym or initialism · Industry-wide — An F-number measure describing short-range variation in a concrete floor surface.
In practice: The flooring report lists tested FF results.
FF on drawings can instead mean finished floor; testing follows the specified method.
Estimating & project controls · Acronym or initialism · Industry-wide — A dependency relating the successor's finish to the predecessor's finish with any stated lag.
In practice: The schedule links cleanup FF to the final installation activity.
FF also means finished floor or floor flatness in other contexts.
Drawings & specifications · Drawing abbreviation · Industry-wide — The elevation assigned to the top of the completed floor at a stated location.
In practice: The site plan sets the first-floor FFE relative to the survey datum.
Confirm the datum and whether multiple finished floor elevations occur.
Project delivery & contracts · Acronym or initialism · Industry-wide — A contract pricing arrangement with a price generally not adjusted for the contractor's actual cost experience.
In practice: The agency awards an FFP contract for a defined scope.
Drawings & specifications · Drawing abbreviation · Industry-wide — The designed final elevation or surface of exterior earthwork and landscaping.
In practice: The grading plan slopes FG away from the building.
Some legends use finish grade as the expansion.
Project team & organizations · Organization · U.S. specific — A U.S. Department of Transportation agency supporting federal highway programs.
In practice: The road project references FHWA guidance on work-zone planning.
Concrete & masonry · Acronym or initialism · Industry-wide — An F-number measure describing variation in a concrete floor's level over the test spacing.
In practice: The slab acceptance report lists FL values for the test areas.
F-number levelness is not the same as a single survey elevation.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — The federal law addressing minimum wage, overtime, recordkeeping, and child labor for covered employment.
In practice: The employer checks FLSA treatment of recorded work hours.
Electrical & fire protection · Acronym or initialism · Industry-wide — A flexible metal raceway used where the installation calls for flexibility.
In practice: The connection detail uses FMC at the equipment.
Safety & occupational health · Acronym or initialism · Industry-wide — A structure intended to protect an equipment operator from specified falling objects.
In practice: The machine selection considers the required FOPS rating.
A rating does not cover every possible impact scenario.
Electrical & fire protection · Acronym or initialism · Industry-wide — Systems and measures intended to limit fire effects, often used for the sprinkler trade package.
In practice: The FP model coordinates sprinkler mains with ducts.
Design phases & commissioning · Acronym or initialism · Industry-wide — A test exercising system operation against defined functional requirements.
In practice: The team performs an FPT of the air-handling sequence.
Test procedures, prerequisites, acceptance, and retesting belong in the commissioning plan.
Concrete & masonry · Acronym or initialism · Industry-wide — Concrete containing discrete fibers intended to improve specified performance characteristics.
In practice: The slab mix includes FRC for the specified application.
Fibers do not automatically replace all conventional reinforcement.
Concrete & masonry · Acronym or initialism · Industry-wide — A composite material combining fibers with a polymer matrix.
In practice: The repair design uses externally bonded FRP reinforcement.
Fire, durability, bond, and installation requirements depend on the system.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — Common trade shorthand for durable fiberglass-reinforced wall panels used in wet or service areas.
In practice: The finish schedule calls for FRP panels in the wash area.
This product meaning is narrower than the structural composite category.
Estimating & project controls · Acronym or initialism · Industry-wide — A schedule dependency in which the successor's start depends on the predecessor's finish, with any stated lag.
In practice: The schedule links cure completion FS to the next operation.
Dates also depend on calendars, constraints, and other logic.
Plumbing & utilities · Acronym or initialism · Industry-wide — A combination damper intended to perform both fire and smoke control functions.
In practice: The controls sequence coordinates the FSD actuator and alarm interface.
Installation, access, and testing must suit the listed assembly.
Workforce, payroll & insurance · Acronym or initialism · Industry-wide — A staffing measure converting work hours to an equivalent number of full-time positions under a defined basis.
In practice: The staffing plan states the hours used to calculate FTE.
Different programs use different full-time definitions.
Drawings & specifications · Drawing abbreviation · Industry-wide — A note asking the responsible party to check an existing condition on site.
In practice: The millwork dimensions are marked FV.
Environment & sustainability · Acronym or initialism · Industry-wide — An organization administering certification and credentialing for LEED and other programs.
In practice: The project team prepares the required GBCI certification submission.
Project team & organizations · Acronym or initialism · Industry-wide — The contractor responsible for coordinating and delivering the overall construction work under its agreement.
In practice: The GC coordinates site access for the trades.
GC may also refer to general conditions in estimates and contracts.
Project team & organizations · Acronym or initialism · Industry-wide — Contract provisions governing project administration; also used for certain project support costs in estimates.
In practice: The estimate lists temporary facilities under GC costs.
Distinguish contract general conditions from the cost category in a budget.
Electrical & fire protection · Acronym or initialism · Industry-wide — The conductor connecting the system or equipment to the grounding electrode system as required.
In practice: The service detail sizes the GEC.
Electrical & fire protection · Acronym or initialism · Industry-wide — A protective device that interrupts a circuit under defined ground-fault conditions to reduce shock risk.
In practice: The temporary-power plan identifies required GFCI protection.
Protection, testing, and installation follow applicable requirements.
Concrete & masonry · Acronym or initialism · Industry-wide — A composite of glass fibers and polymer resin used in selected reinforcement or building products.
In practice: The design specifies GFRP bars for a corrosive exposure.
Design properties differ from steel reinforcement.
Concrete & masonry · Acronym or initialism · Industry-wide — A finely ground ironmaking by-product used as a cementitious material in concrete.
In practice: The mix design includes GGBFS as a portion of the binder.
Slag cement is common terminology in U.S. specifications.
Safety & occupational health · Acronym or initialism · Industry-wide — An international framework for communicating chemical hazards through classification, labels, and safety data sheets.
In practice: The safety training explains GHS hazard pictograms.
Jurisdictions implement the framework through their own requirements.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A system for storing, analyzing, and displaying information tied to geographic locations.
In practice: The utility team maps assets in a GIS.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — An engineered wood member made by bonding lumber laminations with grain mainly along its length.
In practice: The roof spans between GLT beams.
Commonly called glulam.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — An arc welding process using a continuously fed wire electrode and externally supplied shielding gas.
In practice: The shop uses an approved GMAW procedure.
MIG is common shop terminology, though shielding gas and transfer mode vary.
Project delivery & contracts · Acronym or initialism · Industry-wide — A contractual price ceiling subject to the agreement's scope, allowances, exclusions, and adjustment terms.
In practice: The team reconciles the scope before agreeing on the GMP.
A GMP is not a promise that every later owner change is included.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — The collective term for satellite navigation systems used for positioning.
In practice: The rover uses GNSS signals from multiple constellations.
Plumbing & utilities · Unit or symbol · Industry-wide — A volumetric liquid flow rate used in U.S. building-system schedules.
In practice: The pump schedule lists a design flow of 50 GPM.
Confirm U.S. gallons when comparing international data; 1 U.S. gallon is 3.785411784 liters.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A U.S. satellite positioning system used in surveying and equipment guidance.
In practice: The survey crew uses GPS observations for control work.
Project team & organizations · Organization · U.S. specific — A federal agency managing many federal facilities and acquisitions.
In practice: The design team reviews the GSA project deliverables.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — An arc welding process using a nonconsumable tungsten electrode and shielding gas.
In practice: The piping WPS specifies GTAW for a root pass.
Often called TIG welding.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A gypsum panel used for wall or ceiling surfaces in specified assemblies.
In practice: The wall type lists two layers of GWB on each side.
Environment & sustainability · Acronym or initialism · Industry-wide — A measure comparing a greenhouse gas's climate effect with carbon dioxide over a defined time horizon.
In practice: The EPD reports GWP for the declared product unit.
Compare values only when scope, units, and assessment rules are compatible.
Safety & occupational health · Chemical symbol · Industry-wide — A toxic, flammable gas that can occur in sewers and other environments.
In practice: The confined-space assessment considers possible H2S exposure.
Odor is not a reliable warning or exposure measurement.
Safety & occupational health · Acronym or initialism · Industry-wide — The workplace program for communicating chemical hazards through labels, safety data sheets, and training.
In practice: The site HazCom program covers products brought by subcontractors.
Often abbreviated HCS when referring to OSHA's standard.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A trenchless method for installing a bore or utility along a planned curved path.
In practice: The utility contractor proposes HDD beneath the roadway.
Plumbing & utilities · Acronym or initialism · Industry-wide — A thermoplastic used in water, drainage, and other utility pipe systems.
In practice: The utility plan specifies fused HDPE pipe.
Pipe dimension ratio, pressure rating, and joining requirements are project-specific.
Mechanical & HVAC · Acronym or initialism · Industry-wide — A category of high-efficiency air filtration meeting specified test criteria.
In practice: The containment equipment uses a specified HEPA filter.
Filter efficiency alone does not establish complete containment-system performance.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Heated water circulated through a hydronic space-heating system.
In practice: The HHW loop serves the air-handling heating coils.
Distinguish building heating water from domestic hot water.
Safety & occupational health · Acronym or initialism · Industry-wide — A horizontal anchorage line forming part of a designed fall-protection system.
In practice: The roof plan identifies the approved HLL system.
System loads and clearance must be evaluated by appropriately qualified personnel.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — Asphalt paving mixture produced and placed at elevated temperatures.
In practice: The paving plan identifies an HMA surface course.
Mix properties and temperatures depend on the specified system.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Ventilation equipment primarily exchanging sensible heat between air streams.
In practice: The residential design specifies an HRV.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — A structural steel member with a hollow circular, square, or rectangular cross section.
In practice: The canopy columns are specified as square HSS.
Match the exact section dimensions, wall thickness, grade, and specification.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Building systems that provide heating, cooling, air movement, and ventilation.
In practice: The HVAC package includes equipment, ductwork, piping, and controls.
The exact package boundaries depend on the project.
Environment & sustainability · Acronym or initialism · Industry-wide — The condition of indoor air as it relates to occupants' health and comfort.
In practice: The construction IAQ plan addresses dust and moisture before occupancy.
Codes & accessibility · Code, standard or program · U.S. specific — An ICC model code addressing building design and construction.
In practice: The code summary identifies the adopted IBC edition.
Local adoption and amendments determine enforceable requirements.
Project team & organizations · Organization · U.S. specific — An organization publishing model building and related codes.
In practice: The permit set identifies the adopted ICC code edition.
Concrete & masonry · Acronym or initialism · Industry-wide — A formwork system, commonly left in place, that combines concrete placement with insulation.
In practice: The residential wall system uses ICF forms and reinforced concrete.
The form product is only one part of the structural and enclosure assembly.
Safety & occupational health · Acronym or initialism · Industry-wide — A NIOSH exposure condition or value relevant to escape impairment and serious health danger.
In practice: The respiratory protection assessment considers IDLH conditions.
IDLH values are not routine acceptable exposure targets.
Codes & accessibility · Code, standard or program · U.S. specific — An ICC model code addressing building energy efficiency.
In practice: The energy compliance documents identify the applicable IECC provisions.
Project delivery & contracts · Acronym or initialism · Industry-wide — A formal invitation to submit bids for specified work under stated bidding rules.
In practice: The agency publishes an IFB with plans and a bid schedule.
Codes & accessibility · Code, standard or program · U.S. specific — An ICC model code addressing fire prevention and fire-safety conditions.
In practice: The site fire-access plan references the adopted IFC.
IFC also means issued for construction or Industry Foundation Classes.
BIM & digital coordination · Digital standard · Industry-wide — An open data schema for exchanging and sharing built-asset information.
In practice: The design team exports an IFC model for coordination.
IFC also means issued for construction or International Fire Code.
Design phases & commissioning · Acronym or initialism · Industry-wide — A document status indicating issuance for construction use under the project's control process.
In practice: The superintendent checks that the field set carries the correct IFC revision.
The stamp is not a substitute for required permits or contractual authorization.
Design phases & commissioning · Acronym or initialism · Industry-wide — A document status indicating an issue for bidding or tendering.
In practice: The estimator prepares the bid from the IFT set.
U.S. projects may instead say issued for bid; status terminology varies.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A sealed glazing assembly of multiple panes separated by a spacer and enclosed space.
In practice: The window schedule specifies the IGU makeup.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A single-number rating for impact sound transmission through a floor-ceiling assembly.
In practice: The flooring submittal reports the tested IIC assembly.
Field performance and tested laboratory ratings can differ.
Electrical & fire protection · Acronym or initialism · Industry-wide — A metal raceway with dimensions and construction between common tubing and rigid conduit systems.
In practice: The specification allows IMC for selected exposed runs.
Codes & accessibility · Code, standard or program · U.S. specific — An ICC model code addressing mechanical systems.
In practice: The mechanical notes identify the adopted IMC edition.
IMC also means intermediate metal conduit in electrical specifications.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — The elevation of the inside bottom of a pipe or channel at a stated location.
In practice: The drainage profile labels the INV at the structure outlet.
Some legends use INV simply for invert; confirm the datum and units.
Codes & accessibility · Code, standard or program · U.S. specific — An ICC model code addressing plumbing systems.
In practice: The plumbing design cites the adopted IPC edition.
Project delivery & contracts · Acronym or initialism · Industry-wide — A collaborative delivery approach that coordinates owner, designer, and builder interests early in the project.
In practice: The IPD team jointly evaluates constructability and cost.
Some projects use multiparty contracts; collaborative practices alone do not define contract terms.
Codes & accessibility · Code, standard or program · U.S. specific — An ICC model code addressing qualifying detached one- and two-family dwellings and townhouses.
In practice: The permit drawings identify whether the work falls under the adopted IRC.
Project delivery & contracts · Acronym or initialism · Industry-wide — A request for contractors or suppliers to submit a bid on described work.
In practice: The GC sends an ITB to electrical subcontractors.
Quality & inspection · Acronym or initialism · Industry-wide — A plan identifying inspections, tests, acceptance criteria, and responsible parties for the work.
In practice: The ITP identifies witness and hold points before concealment.
Safety & occupational health · Acronym or initialism · Industry-wide — A structured review of job steps, associated hazards, and protective measures.
In practice: The crew reviews the JHA before beginning a new task.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — The approved target proportions and properties for a paving mixture.
In practice: The plant operates to the accepted JMF and specified tolerances.
Safety & occupational health · Acronym or initialism · Industry-wide — A task analysis identifying hazards and ways to control them, often used similarly to JHA.
In practice: The foreperson updates the JSA when the work sequence changes.
Terminology and forms vary among employers.
Electrical & fire protection · Unit or symbol · Industry-wide — A conductor cross-sectional area unit commonly used for larger cables.
In practice: The feeder schedule specifies a 500 kcmil conductor.
Legacy drawings may use MCM for the same unit.
Units & measurements · Unit or symbol · Industry-wide — A stress unit equal to 1,000 pounds per square inch.
In practice: The steel material schedule states yield strength in ksi.
A kip is 1,000 pounds-force, not 1,000 pounds of mass in a general physics calculation.
Units & measurements · Unit or symbol · Industry-wide — A unit of apparent electrical power equal to 1,000 volt-amperes.
In practice: The transformer schedule lists its kVA rating.
Real power in kW depends on power factor and operating conditions.
Units & measurements · Unit or symbol · Industry-wide — A unit of power equal to 1,000 watts.
In practice: The equipment schedule lists a 15 kW electrical input.
Power and energy are different quantities.
Units & measurements · Unit or symbol · Industry-wide — A unit of energy equal to one kilowatt of power sustained for one hour.
In practice: The meter records monthly consumption in kWh.
A kWh is a unit of energy, not an instantaneous demand.
Environment & sustainability · Acronym or initialism · Industry-wide — A method assessing environmental impacts across defined stages of a product or building life cycle.
In practice: The design team compares alternatives using an LCA with consistent boundaries.
Results depend on functional unit, boundaries, assumptions, and data quality.
Estimating & project controls · Acronym or initialism · Industry-wide — An economic comparison including relevant costs over a defined analysis period.
In practice: The owner compares roof options using LCCA.
LCCA addresses costs; LCA assesses environmental impacts.
Civil, survey & earthwork · Unit or symbol · Industry-wide — A cubic yard of excavated or handled material in a loose condition.
In practice: The haul plan converts bank excavation into estimated LCY.
Project delivery & contracts · Acronym or initialism · Industry-wide — A contractually stated amount used for a specified breach, often late completion, subject to applicable law.
In practice: The scheduler reviews the LD clause alongside milestone dates.
Enforceability and application depend on the agreement and law.
Environment & sustainability · Acronym or initialism · Industry-wide — A green building rating system administered through the USGBC and certification framework.
In practice: The project tracks documentation for targeted LEED credits.
A product alone does not make a building LEED certified.
Safety & occupational health · Acronym or initialism · Industry-wide — The minimum fuel concentration in air capable of propagating flame under specified conditions.
In practice: The atmospheric test report states results as percent LEL.
Instrument readings, calibration gas, and oxygen conditions require competent interpretation.
Units & measurements · Unit or symbol · Industry-wide — A length measurement of one foot along an item.
In practice: The takeoff records base trim in LF.
State whether allowances, waste, and accessories are included.
Safety & occupational health · Acronym or initialism · Industry-wide — The lower fuel concentration boundary for flame propagation under stated conditions.
In practice: The safety data sheet lists an LFL value for the product.
LEL and LFL are commonly used for the same lower flammability boundary.
Electrical & fire protection · Acronym or initialism · Industry-wide — Flexible metal conduit with an outer covering providing the specified liquidtight protection.
In practice: The motor connection uses LFMC with listed fittings.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A ranging method using laser measurements to capture positions and surfaces.
In practice: A LiDAR scan records the existing facade geometry.
Point-cloud accuracy and coverage must suit the intended use.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — The moisture content at a defined boundary between plastic and liquid soil behavior in a standardized test.
In practice: The laboratory reports LL for the clay sample.
On structural plans, LL usually means live load.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — A variable load associated with occupancy or use under the governing design criteria.
In practice: The floor design uses the specified office LL.
LL in a soil laboratory report means liquid limit.
BIM & digital coordination · Acronym or initialism · Industry-wide — A framework describing the reliability and development of model elements for specified uses.
In practice: The BIM deliverable sets LOD requirements by element and milestone.
Level of development is not simply visual detail; some documents use LOD for level of detail.
Project delivery & contracts · Acronym or initialism · Industry-wide — A letter recording an intended arrangement or proposed next step before a fuller agreement.
In practice: The parties issue an LOI for early procurement discussions.
Whether provisions bind the parties depends on the wording and applicable law.
Safety & occupational health · Acronym or initialism · Industry-wide — Procedures using locks, tags, and other required measures to control hazardous energy during servicing or work.
In practice: The crew follows the applicable LOTO procedure before maintenance.
Construction tasks may be governed by task-specific energy-control provisions; identify the applicable rules.
Estimating & project controls · Acronym or initialism · Industry-wide — A collaborative production planning and control system associated with Lean construction.
In practice: The team uses LPS to make work ready before weekly commitments.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — A design approach using factored loads and factored resistance to check limit states.
In practice: The steel calculation uses LRFD combinations.
Do not mix ASD loads or capacities with LRFD values.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — Engineered structural lumber made from oriented wood strands bonded into a member.
In practice: The wall system uses LSL rim board.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — An engineered wood product made by bonding wood veneers, generally with grain oriented along the member.
In practice: The opening header is specified as LVL.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A commercial term for decorative layered vinyl flooring products.
In practice: The designer specifies an LVT plank product.
The term alone does not define wear layer, installation, or performance.
Units & measurements · Unit or symbol · Industry-wide — A common U.S. HVAC capacity abbreviation meaning 1,000 Btu per hour.
In practice: The boiler schedule lists 200 MBH output.
In this usage M means one thousand, not one million.
Electrical & fire protection · Acronym or initialism · Industry-wide — An assembly grouping motor controllers and related protective equipment.
In practice: The electrical room layout reserves space for the MCC.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — The highest dry density obtained for a soil under a specified laboratory compaction method.
In practice: Field density is compared with the specified percentage of MDD.
Different compaction test methods can produce different reference values.
Project team & organizations · Acronym or initialism · Industry-wide — The three major building-services disciplines frequently coordinated together.
In practice: The MEP team resolves conflicts above the corridor ceiling.
Project team & organizations · Acronym or initialism · Industry-wide — An expanded building-services grouping that explicitly includes fire protection.
In practice: The MEPF coordination model includes sprinkler mains.
Mechanical & HVAC · Acronym or initialism · Industry-wide — A filter efficiency rating under the applicable ASHRAE test procedure.
In practice: The filter schedule specifies a MERV rating and pressure-drop limits.
Safety & occupational health · Acronym or initialism · Industry-wide — A category of powered equipment used to elevate workers to work positions.
In practice: The lift plan identifies the MEWP type and required familiarization.
Use the manufacturer's instructions and applicable equipment standard.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — An access structure for inspection or maintenance of underground utilities.
In practice: The utility profile identifies the MH rim and invert elevations.
Drawings & specifications · Drawing abbreviation · Industry-wide — The opening formed within masonry to receive a frame or other assembly.
In practice: The mason confirms the MO before laying the jamb.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — Planning and operations used to maintain traffic movement and safety during work.
In practice: The contractor submits an MOT plan for the bridge staging.
Agency terminology differs; confirm the required plan format.
Units & measurements · Unit or symbol · Industry-wide — An SI pressure or stress unit equal to one million pascals.
In practice: An imported test report gives concrete strength in MPa.
Convert units before comparing specifications and test results.
Environment & sustainability · Acronym or initialism · Industry-wide — A publicly owned stormwater conveyance system covered by the relevant regulatory definition.
In practice: The site discharges toward a regulated MS4.
An MS4 is distinct from a combined sanitary and storm sewer system.
Safety & occupational health · Legacy terminology · Industry-wide — The older name for chemical hazard information sheets preceding standardized SDS terminology.
In practice: The archive contains a document labeled MSDS.
Request the current SDS for current product decisions.
Quality & inspection · Acronym or initialism · Industry-wide — A nondestructive method detecting suitable surface and near-surface discontinuities in ferromagnetic materials.
In practice: The inspection plan requires MT at selected weld locations.
It is not applicable to every metal or defect type.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — The U.S. manual establishing standards for traffic control devices on roads open to public travel.
In practice: The traffic engineer identifies the applicable MUTCD edition and supplements.
Use the edition and jurisdictional requirements applicable to the project.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — The reported penetration resistance from a standard penetration test under its test procedure.
In practice: The engineer reviews corrected N-values when evaluating soil behavior.
Raw, corrected, and normalized values are not interchangeable.
Drawings & specifications · Drawing abbreviation · Industry-wide — A marker showing that a listed requirement or field does not apply in the stated context.
In practice: The schedule marks the unused finish field N/A.
A blank field and an explicit N/A can carry different meanings.
Electrical & fire protection · Acronym or initialism · Industry-wide — A circuit supplying or controlling fire-alarm notification appliances.
In practice: The FA contractor checks NAC loading for horns and strobes.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A vertical reference datum appearing on many U.S. survey and construction documents.
In practice: The plans state that elevations are referenced to NAVD 88.
Check the project datum and transformation requirements; never mix datums casually.
Quality & inspection · Acronym or initialism · Industry-wide — A record identifying work or material that does not meet a stated requirement.
In practice: The inspector issues an NCR for an unapproved substitution.
Disposition requires the authority identified in the quality process.
Quality & inspection · Acronym or initialism · Industry-wide — Examination of material or work using methods that do not destroy its intended usefulness.
In practice: The specification identifies required NDE of selected welds.
Often used alongside NDT; the governing specification controls terminology.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — An American Wood Council design standard for wood members and connections.
In practice: The structural notes identify the applicable NDS edition.
Quality & inspection · Acronym or initialism · Industry-wide — Testing used to evaluate material or work without destroying its intended usefulness.
In practice: The weld inspection plan specifies NDT methods and acceptance criteria.
Method suitability and personnel qualification depend on the application.
Electrical & fire protection · Acronym or initialism · Industry-wide — NFPA 70, the model electrical installation code widely adopted in U.S. jurisdictions.
In practice: The electrical notes identify the adopted NEC edition and amendments.
Publication of a new edition does not automatically make it the locally enforced edition.
Project team & organizations · Organization · U.S. specific — A trade association representing electrical contractors and publishing installation resources.
In practice: The electrical contractor uses NECA training materials.
Project team & organizations · Organization · U.S. specific — An organization developing fire, electrical, and life-safety codes and standards.
In practice: The electrical notes identify the relevant NFPA document.
Project team & organizations · Organization · U.S. specific — A U.S. organization supporting building science and information resources.
In practice: The team consults NIBS resources for building coordination.
Drawings & specifications · Drawing abbreviation · Industry-wide — An indication that an item falls outside the identified contract scope.
In practice: The equipment schedule labels loose furnishings NIC.
Confirm whose contract is being referenced.
Project team & organizations · Organization · U.S. specific — The federal institute conducting occupational safety and health research within CDC.
In practice: The industrial hygienist checks NIOSH technical guidance.
Environment & sustainability · Acronym or initialism · Industry-wide — A formal notice requesting coverage or initiating a process under the relevant program.
In practice: The construction operator submits an NOI for general-permit coverage.
Submission and authorization timing depend on the actual permit.
Environment & sustainability · Acronym or initialism · Industry-wide — A notice ending permit coverage when applicable conditions are satisfied.
In practice: The operator evaluates stabilization requirements before filing the NOT.
Do not assume project completion automatically terminates permit duties.
Environment & sustainability · Acronym or initialism · Industry-wide — The U.S. water-pollution permitting program for covered point-source discharges.
In practice: The operator determines the applicable NPDES construction permit authority.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A single-number rating summarizing sound absorption at selected frequencies.
In practice: The ceiling schedule lists the ACT panel's NRC.
Absorption is different from blocking sound through a wall.
Project delivery & contracts · Acronym or initialism · Industry-wide — A stated spending or authorization limit for a defined item or scope.
In practice: The owner authorizes investigation up to an NTE amount.
Clarify included costs and what approval is needed to exceed the limit.
Project delivery & contracts · Acronym or initialism · Industry-wide — A formal instruction establishing permission or a contractual date to begin specified work.
In practice: The owner issues the NTP after required prerequisites are complete.
Drawings & specifications · Drawing abbreviation · Industry-wide — A warning that a view is schematic or not drawn to a usable measurement scale.
In practice: The wiring diagram is labeled NTS.
Use stated dimensions and clarification; do not measure the graphic to infer size.
Design phases & commissioning · Acronym or initialism · Industry-wide — The information and activities needed to operate, inspect, and maintain an asset.
In practice: The closeout package includes O&M manuals and training records.
Operation and maintenance is another common expansion.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Air drawn from outside the building for ventilation or other system purposes.
In practice: The sequence specifies minimum OA flow.
OA may appear as outside air in project legends.
Project team & organizations · Acronym or initialism · Industry-wide — The core parties in a common project coordination meeting format.
In practice: The OAC meeting reviews decisions, schedule, and pending changes.
Drawings & specifications · Drawing abbreviation · Industry-wide — Spacing measured between corresponding centerlines of repeated elements.
In practice: Studs are shown at 16 inches OC.
Verify the specified spacing and exceptions around openings.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — A project insurance arrangement sponsored by the owner for defined enrolled parties and coverage.
In practice: The contractor reviews OCIP enrollment and excluded activities.
Covered parties, work, periods, exclusions, and deductibles follow the program documents.
Project delivery & contracts · Acronym or initialism · Industry-wide — A responsibility split where the owner supplies an item and the contractor installs it.
In practice: The schedule identifies OFCI imaging equipment delivery dates.
Confirm unloading, storage, testing, and warranty responsibilities.
Project delivery & contracts · Acronym or initialism · Industry-wide — A responsibility split where the owner supplies and installs an item.
In practice: The drawing notes OFOI furniture in the reception area.
Workforce, payroll & insurance · Acronym or initialism · Industry-wide — Training delivered through supervised work activities.
In practice: The apprentice's OJT record tracks qualifying work experience.
OJT is not a substitute for required task-specific certification.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — The moisture content associated with maximum dry density under a specified compaction test.
In practice: The crew conditions the fill near the specified OMC before compaction.
Drawings & specifications · Drawing abbreviation · Industry-wide — A direction or instruction applying a detail to an opposite side or hand.
In practice: The detail note says OPP hand at the second entrance.
Design phases & commissioning · Acronym or initialism · Industry-wide — A document expressing the owner's functional needs, performance expectations, and success criteria.
In practice: The owner updates the OPR when occupancy requirements change.
Keep accepted revisions aligned with design and testing.
Electrical & fire protection · Acronym or initialism · Industry-wide — A valve construction with the stem threads outside the valve body and a visible stem position.
In practice: The sprinkler riser detail identifies an OS&Y valve.
Confirm the valve's listing and intended system use.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — A wood structural panel made from bonded strands arranged in oriented layers.
In practice: The sheathing schedule specifies OSB thickness and fastening.
Project team & organizations · Organization · U.S. specific — The federal workplace safety and health agency within the U.S. Department of Labor.
In practice: The safety manager consults OSHA construction requirements.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — Work time or premium pay treated as overtime under applicable law, agreement, or employer policy.
In practice: The payroll reviewer checks OT across job-coded time entries.
Job changes do not automatically restart an employee's workweek for overtime purposes.
Safety & occupational health · Acronym or initialism · Industry-wide — A respirator that uses a powered blower to move air through filtering components.
In practice: The respiratory program identifies the appropriate PAPR configuration.
Filter, atmosphere, fit, and program requirements depend on the equipment and exposure.
Concrete & masonry · Acronym or initialism · Industry-wide — Concrete cast away from its final installed position and moved into place after gaining sufficient strength.
In practice: The crane plan includes erection of PC wall panels.
PC has many meanings; confirm the structural legend.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — Concrete made with portland cement or a specified blended cementitious system, commonly distinguished from asphalt paving.
In practice: The roadway details show PCC pavement at the intersection.
Project delivery & contracts · Acronym or initialism · Industry-wide — A proposed or anticipated contract change tracked before final approval.
In practice: The team logs a PCO while the subcontractor prices revised footings.
Some project systems expand PCO as proposed change order.
Estimating & project controls · Acronym or initialism · Industry-wide — A schedule network approach linking activities through defined dependency relationships.
In practice: The schedule uses PDM relationships between trade activities.
Project team & organizations · Acronym or initialism · Industry-wide — A project staff role supporting coordination, submittals, RFIs, and field documentation.
In practice: The contractor's PE maintains the submittal log.
This job title does not establish professional engineering licensure.
Project team & organizations · Acronym or initialism · Industry-wide — A person licensed to practice engineering by a U.S. licensing jurisdiction.
In practice: A PE seals documents where required for the assigned discipline.
License status, discipline, and permitted services must be checked with the relevant board.
Safety & occupational health · Acronym or initialism · Industry-wide — An enforceable occupational exposure limit under the applicable OSHA provision.
In practice: The exposure assessment compares results with the relevant PEL.
The substance, averaging period, jurisdiction, and applicable rule matter.
Plumbing & utilities · Acronym or initialism · Industry-wide — A polymer piping material used in water distribution and other approved applications.
In practice: The water distribution detail specifies PEX connections.
Use compatible listed fittings and the specified installation method.
Safety & occupational health · Acronym or initialism · Industry-wide — A connected system designed to arrest a worker's fall under specified conditions.
In practice: The fall-protection plan identifies compatible PFAS components and rescue arrangements.
In environmental documents PFAS refers to a family of chemicals, not fall protection.
Environment & sustainability · Acronym or initialism · Industry-wide — A broad group of manufactured fluorinated chemicals relevant to some environmental and material assessments.
In practice: The remediation report evaluates PFAS in sampled water.
In construction safety, PFAS means personal fall arrest system; the meanings are unrelated.
Design phases & commissioning · Acronym or initialism · Industry-wide — A checklist recording installation and readiness conditions before functional testing.
In practice: The installer completes the PFC before the witnessed test.
Project terminology may call these construction checklists.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — The difference between a soil's liquid limit and plastic limit.
In practice: The earthwork specification sets a PI criterion for imported fill.
Test results describe material behavior; acceptance follows the project specification.
Electrical & fire protection · Acronym or initialism · Industry-wide — A valve assembly with a visible indication of valve position, commonly used on fire-protection mains.
In practice: The utility plan identifies the PIV outside the building.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — A groove weld condition with penetration limited to the specified portion of joint thickness.
In practice: The shop drawing identifies the required PJP weld size.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — The moisture content at a defined boundary between semisolid and plastic soil behavior.
In practice: The laboratory measures PL for the soil classification.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — A pre-hire collective bargaining agreement setting terms for work on a specified construction project.
In practice: The contractor reviews the project's PLA before planning labor deployment.
Applicability and terms are project-specific.
Project team & organizations · Acronym or initialism · Industry-wide — The person coordinating project scope, schedule, budget, and communication for an organization.
In practice: The PM tracks unresolved decisions before the next milestone.
The same title can represent the owner, designer, or contractor.
Project delivery & contracts · Acronym or initialism · Industry-wide — A purchasing document identifying ordered goods or services and commercial terms.
In practice: The buyer issues a PO for specified pumps.
Estimating & project controls · Acronym or initialism · Industry-wide — A Lean planning measure of commitments completed as promised during a defined planning period.
In practice: The weekly review measures PPC and discusses reasons for variance.
Use a consistent definition of a completed commitment.
Safety & occupational health · Acronym or initialism · Industry-wide — Equipment worn to reduce exposure to specific workplace hazards.
In practice: The JHA identifies task-appropriate PPE before work starts.
PPE selection is one part of hazard control, not a complete safety plan.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — A record of welding variables and test results supporting procedure qualification.
In practice: The fabricator submits a PQR supporting the proposed WPS.
Project delivery & contracts · Acronym or initialism · Industry-wide — A request to price a possible change so the owner can assess its effects.
In practice: The architect issues a PR for upgraded doors.
A proposal request generally seeks pricing; check whether separate authorization is needed to proceed.
Safety & occupational health · Acronym or initialism · Industry-wide — A confined space with one or more specified hazards triggering permit-space requirements.
In practice: The entry assessment determines whether the space is a PRCS.
Do not determine entry safety from the acronym alone.
Concrete & masonry · Acronym or initialism · Industry-wide — Concrete in which intentional compressive stresses counteract some effects of applied loading.
In practice: The bridge uses PS girders fabricated off site.
Prestressing includes pretensioning and post-tensioning approaches.
Units & measurements · Unit or symbol · Industry-wide — A U.S. customary pressure or stress unit.
In practice: The concrete schedule states strength in psi.
Distinguish pressure from strength and specify gauge or absolute pressure where relevant.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — Structural composite lumber made from long wood strands bonded mainly parallel to the member length.
In practice: The design specifies PSL posts.
Concrete & masonry · Acronym or initialism · Industry-wide — A prestressing method that tensions tendons after concrete has gained specified strength.
In practice: The slab sequence includes PT stressing and inspection.
Do not cut, drill, or alter tendons based on a glossary explanation.
Quality & inspection · Acronym or initialism · Industry-wide — A nondestructive method using liquid penetrant to reveal surface-breaking discontinuities in suitable materials.
In practice: The inspector performs PT on the specified component.
PT means post-tensioning in concrete work.
Electrical & fire protection · Acronym or initialism · Industry-wide — Technology that converts light into electrical energy.
In practice: The roof plan coordinates PV arrays with access paths.
Estimating & project controls · Acronym or initialism · Industry-wide — The budgeted value of work scheduled to be performed by a specified date.
In practice: The controls report compares PV with EV at the data date.
PV in electrical design usually means photovoltaic.
Plumbing & utilities · Acronym or initialism · Industry-wide — A thermoplastic used in pipes, conduit, membranes, and other building products.
In practice: The plumbing specification identifies permitted PVC pipe applications.
PVC pipe, conduit, and roofing products are not interchangeable.
Quality & inspection · Acronym or initialism · Industry-wide — Planned activities providing confidence that requirements will be met.
In practice: The owner defines QA oversight for the construction process.
QA and QC responsibilities should be explicit in the quality plan.
Quality & inspection · Acronym or initialism · Industry-wide — The combined planning, oversight, testing, and checking processes supporting conformance.
In practice: The project QA/QC plan defines inspection responsibilities and records.
The combined label does not erase the distinction between the two functions.
Quality & inspection · Acronym or initialism · Industry-wide — Operational checks and activities used to verify that work meets requirements.
In practice: The contractor's QC team checks the installation before inspection.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A classification describing the reliability and collection basis of subsurface utility information.
In practice: The utility plan distinguishes QL B mapping from QL A exposure data.
The applicable SUE standard defines each level.
Estimating & project controls · Acronym or initialism · Industry-wide — Measurement or counting of work quantities from project information.
In practice: The estimator checks the concrete QTO against slab dimensions.
Model quantities still require scope and measurement-rule review.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A measure of resistance to heat flow through a material or assembly under stated conditions.
In practice: The wall schedule distinguishes cavity insulation R-value from whole-wall performance.
U.S. and SI R-values have different numeric scales.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Air drawn from a conditioned space back toward the air-handling system.
In practice: The corridor ceiling contains the RA grille.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — Recovered asphalt pavement material processed for reuse.
In practice: The mix design lists the permitted RAP content.
Concrete & masonry · Acronym or initialism · Industry-wide — Concrete containing reinforcement intended to act together under applied loads.
In practice: The section shows an RC foundation wall.
Concrete & masonry · Acronym or initialism · Industry-wide — A stiff concrete mixture placed and compacted using earthmoving and roller equipment.
In practice: The pavement contractor places RCC in planned lifts.
It differs from conventional slump concrete and normal asphalt paving.
Drawings & specifications · Drawing abbreviation · Industry-wide — A plan view showing ceiling layout, heights, finishes, and coordinated devices.
In practice: The RCP locates lights relative to ceiling tiles.
On utility plans, RCP commonly means reinforced concrete pipe.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — Concrete pipe containing reinforcement for the intended structural and service conditions.
In practice: The drainage plan specifies RCP beneath the road.
RCP means reflected ceiling plan in architectural coordination.
Safety & occupational health · Acronym or initialism · Industry-wide — Airborne crystalline silica particles small enough to reach deep into the lungs.
In practice: The task assessment addresses RCS during concrete cutting.
Design phases & commissioning · Acronym or initialism · Industry-wide — Commissioning applied to an existing building or system that was not previously commissioned under the intended process.
In practice: The owner uses RCx to investigate existing operating problems.
Recommissioning is a related term for repeating commissioning; scope definitions vary.
Safety & occupational health · Acronym or initialism · Industry-wide — A NIOSH-recommended occupational exposure limit.
In practice: The industrial hygienist reviews the NIOSH REL with applicable legal limits.
A recommendation is not automatically an enforceable limit.
Project delivery & contracts · Acronym or initialism · Industry-wide — A documented question used to clarify drawings, specifications, or other project information.
In practice: The GC sends an RFI about a conflict between the beam and duct layouts.
An RFI response does not itself authorize added cost or time; follow the contract change process.
Project delivery & contracts · Acronym or initialism · Industry-wide — A solicitation asking respondents to propose an approach, qualifications, and often price.
In practice: The owner issues an RFP for a design-build team.
Project delivery & contracts · Acronym or initialism · Industry-wide — A solicitation focused on a firm's experience, personnel, and ability to perform.
In practice: An RFQ shortlists firms before the owner requests detailed proposals.
In purchasing, RFQ can instead mean request for quotation.
Project delivery & contracts · Acronym or initialism · Industry-wide — A purchasing request for pricing and supply terms on defined goods or services.
In practice: The estimator sends an RFQ to three switchgear suppliers.
Distinguish a price quotation from a qualifications submission.
Electrical & fire protection · Acronym or initialism · Industry-wide — A robust threaded metal raceway used for conductor protection in specified locations.
In practice: The service installation uses RMC where detailed.
Drawings & specifications · Drawing abbreviation · Industry-wide — The framed or unfinished opening sized to receive a door, window, or other assembly.
In practice: The framer checks the RO against the window schedule.
Estimating & project controls · Acronym or initialism · Industry-wide — An early estimate used for planning when project definition is limited.
In practice: The owner requests a ROM budget before selecting a concept.
A ROM estimate is not a firm bid; state scope, assumptions, and uncertainty.
Safety & occupational health · Acronym or initialism · Industry-wide — A protective structure intended to reduce crushing hazards during equipment rollover under its design conditions.
In practice: The equipment inspection checks the ROPS and restraint system.
Protection depends on the equipment design and proper use.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — Land or legal rights designated for a road, utility, or other corridor purpose.
In practice: The utility alignment remains within the indicated ROW.
Confirm the legal boundaries and permitted rights, not just the graphic line.
Plumbing & utilities · Acronym or initialism · Industry-wide — Common terminology for a backflow prevention assembly using a reduced-pressure zone and relief arrangement.
In practice: The domestic water service includes the specified RPZ assembly.
Some standards prefer reduced pressure principle assembly; verify approved device terminology.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A GNSS survey technique using correction data for precise positioning in real time.
In practice: The surveyor checks RTK results against site control.
Accuracy depends on equipment, corrections, conditions, and verification.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Packaged mechanical equipment located on a roof, commonly for heating and cooling.
In practice: The crane plan coordinates RTU placement with curb installation.
Mechanical & HVAC · Acronym or initialism · Industry-wide — Air delivered by a system to a space or process.
In practice: The plan shows SA diffusers along the perimeter.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A polymer used to modify bitumen for roofing and waterproofing products.
In practice: The roofing submittal identifies an SBS-modified sheet.
Safety & occupational health · Acronym or initialism · Industry-wide — Respiratory equipment carrying its own supply of breathing air.
In practice: The trained response team checks the specified SCBA equipment.
Its use requires appropriate training and procedures.
Concrete & masonry · Acronym or initialism · Industry-wide — Concrete proportioned to flow into place and around reinforcement with little or no mechanical consolidation.
In practice: The precaster submits an SCC mixture for congested panels.
Fresh-property tests and placement limits must follow the approved procedure.
Electrical & fire protection · Acronym or initialism · Industry-wide — The specified maximum prospective short-circuit current an assembly or component can withstand under stated conditions.
In practice: The engineer compares equipment SCCR with available fault current.
SCCR is distinct from an interrupting rating.
Concrete & masonry · Acronym or initialism · Industry-wide — A material used with cement to contribute to concrete properties through hydraulic or pozzolanic activity.
In practice: The mix submittal identifies the SCM content.
Common examples include slag cement and fly ash; performance depends on the mixture.
Design phases & commissioning · Acronym or initialism · Industry-wide — An early design phase developing the concept, major relationships, and initial systems approach.
In practice: The owner reviews the SD concept before further design development.
SD in fire-protection drawings may mean smoke detector or smoke damper.
Safety & occupational health · Acronym or initialism · Industry-wide — A standardized document describing a chemical product's hazards and handling information.
In practice: The supervisor checks the SDS before approving a new adhesive.
Use the sheet for the actual product and current formulation.
Project team & organizations · Acronym or initialism · Industry-wide — An engineer working in structural engineering; in some U.S. jurisdictions, SE is also a separately regulated license or title.
In practice: The team checks the SE's authority for the project jurisdiction.
A job title or acronym alone does not prove a current professional license.
Drawings & specifications · Drawing abbreviation · Industry-wide — A cut-through view showing the relationship of components in depth or height.
In practice: The wall SEC shows flashing behind the cladding.
Project team & organizations · Acronym or initialism · Industry-wide — The professional responsible for the project's structural design within the agreed scope.
In practice: The SER reviews a proposed framing revision.
Estimating & project controls · Acronym or initialism · Industry-wide — A dependency relating the successor's finish to the predecessor's start with any stated lag.
In practice: A handover model uses SF where one coverage period cannot end before another begins.
This uncommon dependency should be used deliberately and checked carefully.
Units & measurements · Unit or symbol · Industry-wide — A U.S. customary unit of area equal to 144 square inches.
In practice: The estimate measures flooring in SF.
SF in scheduling means start-to-finish.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — The fraction of incident solar radiation entering through a glazing or fenestration assembly as heat.
In practice: The window selection meets the specified SHGC.
Compare values for the same rated product scope.
Drawings & specifications · Drawing abbreviation · Industry-wide — A drawing reference to a comparable detail that may require identified adjustments.
In practice: A SIM detail applies to the opposite end of the wall.
Similar does not necessarily mean identical.
Electrical & fire protection · Acronym or initialism · Industry-wide — A fire-alarm circuit communicating data among addressable devices and control equipment.
In practice: The fire-alarm riser shows the SLC device loop.
Project team & organizations · Organization · U.S. specific — A trade association producing technical standards used for sheet metal and duct construction.
In practice: The duct specification references a SMACNA construction standard.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — An arc welding process using a flux-covered consumable electrode.
In practice: The erection WPS permits SMAW for the field connection.
Often called stick welding.
Concrete & masonry · Acronym or initialism · Industry-wide — A slab supported by the prepared ground or subbase beneath it.
In practice: The SOG detail includes vapor control and joint locations.
A slab on grade is not necessarily part of the structural foundation system.
Project delivery & contracts · Acronym or initialism · Industry-wide — A submission describing a team's relevant experience, credentials, and capacity.
In practice: The architect includes similar completed projects in its SOQ.
Estimating & project controls · Acronym or initialism · Industry-wide — A breakdown allocating the contract value among work items for payment administration.
In practice: The pay application reports progress against the SOV.
An SOV supports billing and does not necessarily equal the internal cost estimate.
Project delivery & contracts · Acronym or initialism · Industry-wide — The work, deliverables, and boundaries assigned under an agreement or package.
In practice: The SOW identifies who installs roof penetrations.
SOW can also be expanded as statement of work; read the document's definition.
Environment & sustainability · Acronym or initialism · Industry-wide — An EPA oil-pollution prevention program and associated plan requirements for covered facilities.
In practice: The environmental lead checks whether site oil storage triggers SPCC requirements.
Estimating & project controls · Acronym or initialism · Industry-wide — An earned-value ratio calculated as earned value divided by planned value.
In practice: The controls team reports SPI alongside critical-path analysis.
SPI does not directly state the number of days late and can mask critical-path issues.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A geotechnical field test recording penetration resistance during soil sampling.
In practice: The geotechnical report provides SPT results by depth.
Safety & occupational health · Acronym or initialism · Industry-wide — A fall-protection device that retracts line and locks under defined fall conditions.
In practice: The competent person checks the specified SRL for the intended application.
Clearance, leading-edge rating, anchorage, and rescue requirements vary by device and use.
Estimating & project controls · Acronym or initialism · Industry-wide — A dependency relating the successor's start to the predecessor's start with any stated lag.
In practice: The schedule uses SS to model overlapping work areas.
SS can mean stainless steel in material schedules.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — An industry association associated with cold-formed steel framing products and technical resources.
In practice: The specification references SSMA member designations.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A single-number rating of airborne sound isolation derived from standardized testing.
In practice: The partition schedule specifies an STC-rated assembly.
The installed assembly and flanking paths affect real performance.
Safety & occupational health · Acronym or initialism · Industry-wide — An exposure limit averaged over a defined short period under the relevant authority or guidance.
In practice: The hygienist checks short-duration exposure against the applicable STEL.
The source defines the duration and conditions.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A process for managing risks associated with buried utility information using defined investigation methods.
In practice: The design team requests SUE before finalizing foundations near utilities.
Safety & occupational health · Acronym or initialism · Industry-wide — A stated allowable working load under defined conditions, often used in lifting documentation.
In practice: The lift plan identifies the SWL stated for the equipment.
Terminology varies; never infer a lifting capacity from the acronym alone.
Environment & sustainability · Acronym or initialism · Industry-wide — A site-specific plan identifying stormwater pollution sources and control measures under the applicable permit.
In practice: The inspector documents corrective actions required by the SWPPP.
A SWPPP is a plan, not the permit authorization itself.
Units & measurements · Unit or symbol · Industry-wide — A U.S. customary unit of area equal to nine square feet.
In practice: The paving quantity is listed in SY.
Check the measured area and pay-item rules.
Workforce, payroll & insurance · Acronym or initialism · Industry-wide — Processes and systems recording employee work time, attendance, and related exceptions.
In practice: The supervisor approves job-coded T&A records before payroll.
Time records should reflect actual work under the applicable rules.
Project delivery & contracts · Acronym or initialism · Industry-wide — A pricing approach based on specified labor charges and material costs rather than one fixed total.
In practice: The superintendent verifies quantities on a T&M ticket.
Rates, markups, documentation, and limits come from the agreement.
Mechanical & HVAC · Acronym or initialism · Industry-wide — A process measuring and setting air and water system flows to meet specified requirements.
In practice: The TAB contractor records final diffuser and hydronic flow values.
TAB is one input to commissioning, not the whole commissioning process.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A project reference point established for convenient elevation control.
In practice: The crew protects the TBM near the site entrance.
On tunneling projects TBM usually means tunnel boring machine.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A mechanized system that excavates a tunnel and may support or line it as work advances.
In practice: The tunneling plan specifies access for TBM assembly.
Codes & accessibility · Code, standard or program · U.S. specific — A jurisdictional authorization allowing occupancy subject to stated conditions or time limits.
In practice: The owner tracks outstanding conditions listed on the TCO.
Availability and terms depend on the issuing jurisdiction.
Estimating & project controls · Acronym or initialism · Industry-wide — The time an activity can be delayed without delaying the relevant completion date under the schedule's calculation rules.
In practice: The scheduler investigates a reduction in TF.
Float depends on logic, calendars, constraints, and the scheduling method.
Estimating & project controls · Acronym or initialism · Industry-wide — A schedule analysis evaluating how an event or change affects project timing.
In practice: The scheduler prepares a TIA for the proposed change.
The contract or agreed protocol defines the analysis method and data date.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A coordinated plan addressing work-zone traffic control and other transportation impacts.
In practice: The project TMP includes incident response and public information.
Drawings & specifications · Drawing abbreviation · Industry-wide — An elevation or position prefix identifying the upper surface of a named element.
In practice: The detail gives the TO curb elevation.
TO can be an ordinary word; capitalization matching helps the decoder.
Drawings & specifications · Drawing abbreviation · Industry-wide — The upper surface elevation of a named concrete element.
In practice: The footing detail gives TOC at the pedestal.
TOC can mean top of curb on civil drawings.
Drawings & specifications · Drawing abbreviation · Industry-wide — The elevation of the upper surface of a curb.
In practice: The grading plan gives TOC at each curb return.
Read the civil legend; building sections may use top of concrete.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A survey recording ground features and elevations for planning and design.
In practice: The civil engineer uses the TOPO to develop grading.
Drawings & specifications · Drawing abbreviation · Industry-wide — The elevation at the top surface of the specified structural steel member.
In practice: The framing plan assigns a TOS elevation to a beam.
Some project legends use TOS for top of slab; confirm the legend.
Drawings & specifications · Drawing abbreviation · Industry-wide — The elevation at the upper surface of the indicated slab.
In practice: The section labels the garage TOS below the finished floor.
Distinguish this from top of steel on structural plans.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A thermoplastic single-ply roofing membrane material.
In practice: The roof specification identifies a TPO membrane system.
Safety & occupational health · Acronym or initialism · Industry-wide — A safety metric commonly calculated from recordable cases and employee hours using a 200,000-hour base.
In practice: The contractor reports TRIR with its case count and hours.
Definitions, workforce scope, and reporting period must match when comparing rates.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — Devices and arrangements guiding road users through a temporary work condition.
In practice: The TTC layout includes signs, channelizing devices, and taper geometry.
Safety & occupational health · Acronym or initialism · Industry-wide — An exposure concentration averaged over a specified period with time weighting.
In practice: The report identifies the averaging period for the TWA result.
Always state the time period; TWA alone does not specify one.
Drawings & specifications · Drawing abbreviation · Industry-wide — A note indicating that a detail or condition applies to similar locations unless otherwise identified.
In practice: A TYP note applies to repeated guardrail connections.
Do not extend a typical detail to conditions the documents do not cover.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — The rate of heat transfer through an assembly per unit area and temperature difference.
In practice: The energy model uses the rated window U-factor.
Lower U-factor indicates less heat transfer under the stated rating conditions.
Concrete & masonry · Acronym or initialism · Industry-wide — A category of cementitious material with high mechanical performance and durability, often with fiber reinforcement.
In practice: The bridge joint detail specifies UHPC closure pours.
Use the project's performance definition and qualification requirements.
Drawings & specifications · Drawing abbreviation · Industry-wide — A qualifier stating that a general instruction applies except where specific notes override it.
In practice: The structural notes specify a default cover UNO.
Resolve conflicting notes through the document hierarchy and clarification process.
Drawings & specifications · Drawing abbreviation · Industry-wide — A qualifier that allows a specific note to override a general instruction.
In practice: The drawing gives typical anchor spacing UON.
Equivalent wording is often abbreviated UNO.
Electrical & fire protection · Acronym or initialism · Industry-wide — Equipment providing continuity of power for a defined load during supply disturbances or interruptions.
In practice: The controls server is connected to a UPS.
Runtime and supported load depend on system design and battery condition.
Project team & organizations · Organization · U.S. specific — A federal agency involved in military facilities, civil works, and other engineering missions.
In practice: The contractor checks the USACE project's contract requirements.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — A system grouping soils using particle size and plasticity characteristics.
In practice: The boring log classifies the material as CL under USCS.
Environment & sustainability · Acronym or initialism · Industry-wide — The organization associated with developing the LEED green building rating system.
In practice: The team checks USGBC resources for the selected rating system.
Quality & inspection · Acronym or initialism · Industry-wide — A nondestructive method using high-frequency sound to examine material or welds.
In practice: The inspector performs UT where required by the weld inspection plan.
Mechanical & HVAC · Acronym or initialism · Industry-wide — An air-distribution approach that varies airflow to meet zone requirements.
In practice: The controls sequence adjusts the VAV terminal airflow.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A resilient floor tile product containing vinyl binder and mineral fillers.
In practice: The finish schedule assigns VCT to the storage room.
BIM & digital coordination · Acronym or initialism · Industry-wide — The use of integrated digital models and planning methods to improve project delivery.
In practice: The VDC team combines coordination models with installation planning.
Estimating & project controls · Acronym or initialism · Industry-wide — A structured review seeking required functions and performance at an appropriate life-cycle cost.
In practice: The team evaluates a VE alternative while preserving required durability.
A lower first cost alone does not establish equal value or performance.
Mechanical & HVAC · Acronym or initialism · Industry-wide — An electronic drive controlling an AC motor by varying supply frequency and related electrical output.
In practice: The fan's VFD modulates speed under the controls sequence.
Electrical installation and motor compatibility remain separate design checks.
Drawings & specifications · Drawing abbreviation · Industry-wide — An instruction to confirm an actual site dimension or condition before proceeding.
In practice: The installer must VIF the opening before ordering the frame.
Field verification does not authorize changing design requirements.
Environment & sustainability · Acronym or initialism · Industry-wide — An organic compound with volatility characteristics defined by the relevant air-quality or product program.
In practice: The finish specification sets a VOC criterion for adhesive.
VOC content and product emissions are different measures.
Mechanical & HVAC · Acronym or initialism · Industry-wide — A refrigerant-based system that varies refrigerant flow to multiple indoor units.
In practice: The VRF submittal identifies connected indoor-unit capacities.
Plumbing & utilities · Acronym or initialism · Industry-wide — A plumbing vent termination extending through the roof.
In practice: The roof plan coordinates the VTR with flashing and clearances.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — An AISC steel shape designation for a wide-flange beam or column.
In practice: The framing schedule lists a W shape by depth and weight.
A single letter is omitted from passage decoding to reduce ordinary-word matches.
Concrete & masonry · Unit or symbol · Industry-wide — The mass of water divided by the mass of cement in a concrete mixture.
In practice: The laboratory distinguishes w/c from w/cm on the mix report.
Confirm which binder components the specification includes.
Concrete & masonry · Unit or symbol · Industry-wide — The mass of water divided by the mass of cementitious materials in a concrete mixture.
In practice: The specification limits w/cm for the exposure condition.
This differs from water-cement ratio when supplementary materials are present.
Project team & organizations · Organization · U.S. specific — A building design and delivery reference resource associated with NIBS.
In practice: The commissioning lead reviews WBDG guidance on project requirements.
Estimating & project controls · Acronym or initialism · Industry-wide — A hierarchical organization of project work into manageable elements.
In practice: The estimate and schedule align to the WBS.
Keep the work scope and coding rules consistent across systems.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — The insurance and legal system addressing covered work-related injury or illness benefits.
In practice: The contractor provides required WC coverage documentation.
State requirements and policy terms vary.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — A document identifying applicable wage and fringe benefit rates and classifications under a prevailing wage program.
In practice: The payroll specialist uses the WD incorporated into the contract.
Check the correct determination, modification, and contract terms.
Workforce, payroll & insurance · Acronym or initialism · U.S. specific — An optional DOL form used to report payroll for covered Davis-Bacon and Related Acts construction work.
In practice: The contractor completes WH-347 or an acceptable equivalent submission.
The form is optional; required payroll reporting and certification for covered work are not optional.
Project team & organizations · Organization · U.S. specific — The DOL division administering federal wage laws and certain government-contract labor standards.
In practice: The contractor reviews WHD certified payroll instructions.
Estimating & project controls · Acronym or initialism · Industry-wide — Work or contract activity not yet complete, often summarized in construction accounting reports.
In practice: The monthly WIP report reconciles cost, billing, and projected completion.
Accounting methods and report definitions must be stated.
Safety & occupational health · Acronym or initialism · Industry-wide — The maximum working load assigned to a lifting component for specified conditions of use.
In practice: The rigger checks the sling WLL for the intended configuration.
Angles, configuration, condition, and manufacturer limits affect suitability.
Civil, survey & earthwork · Acronym or initialism · Industry-wide — Asphalt mixture produced with technologies allowing lower production or placement temperatures than comparable HMA.
In practice: The contractor submits a WMA mix design for review.
WMA is a technology category rather than one fixed temperature.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — Documentation or testing demonstrating a welder's ability within a qualified range.
In practice: The inspector verifies WPQ coverage for the work.
Qualification range and continuity requirements depend on the governing code.
Structural steel, wood & welding · Acronym or initialism · Industry-wide — A document specifying the variables and instructions for making a qualified weld.
In practice: The welder follows the approved WPS for the connection.
Envelope, roofing & finishes · Acronym or initialism · Industry-wide — A layer intended to resist liquid water penetration behind exterior cladding.
In practice: The installer integrates window flashing with the WRB.
Water resistance, air control, and vapor control are distinct functions.
Plumbing & utilities · Acronym or initialism · Industry-wide — A relative water-supply demand unit used in plumbing sizing methods.
In practice: The plumbing calculation totals WSFU for the fixture group.
Concrete & masonry · Legacy terminology · Industry-wide — A legacy term commonly used for welded wire reinforcement.
In practice: An older drawing calls the slab mesh WWF.
Current documents often prefer WWR; verify wire sizes and spacing.
Estimating & project controls · Acronym or initialism · Industry-wide — A short-term plan recording reliable work commitments for the coming week.
In practice: The forepersons agree on the WWP after checking constraints.
Concrete & masonry · Acronym or initialism · Industry-wide — A reinforcement product made from intersecting wires joined by welding.
In practice: The slab schedule specifies WWR size and placement.
Read reports and talk across disciplines with fewer misunderstandings. Explore eight distinctions that help prevent confusion.
An RFI seeks clarification. A change order records an agreed contract change. A construction change directive directs a change while its adjustment is unresolved. Follow the contract for authority and notice.
In a change log, CO usually means change order. At occupancy, it can mean certificate of occupancy. On a plumbing drawing, it can mean cleanout. Safety documents also use CO for carbon monoxide.
Architecture uses RCP for reflected ceiling plan. Civil and drainage drawings use it for reinforced concrete pipe. Check the discipline and drawing legend.
A personal fall arrest system helps arrest a worker’s fall. Per- and polyfluoroalkyl substances are a family of manufactured chemicals. The two uses share letters, not a purpose.
Owner’s project requirements describe the performance and outcomes the owner needs. The basis of design explains the design team’s technical approach to meeting those needs.
Quality assurance establishes confidence in the process. Quality control checks the work and its conformity. The project quality plan assigns the responsibilities for each.
IFC can be a document issue status, an open model exchange schema, or the International Fire Code. Confirm the context before using an IFC file or instruction.
Certified payroll reports document covered payroll and certification. Cardiopulmonary resuscitation is an emergency response skill. The subject identifies the intended meaning.
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Disclaimer: The TimeTrex USA Construction Acronym Database is provided for general information and educational use only and does not constitute engineering, architectural, legal, or safety advice. Abbreviations and search or decoding results may differ by drawing set, contract, trade, project, and jurisdiction. TimeTrex does not guarantee the accuracy, completeness, or currency of the information. Definitions and examples do not establish code compliance, authorize work, or replace professional judgment. Confirm terminology against the project legend, contract documents, applicable code edition, manufacturer instructions, and approved site procedures, and consult the responsible qualified professional before acting. References and external links do not imply endorsement by the organizations mentioned.
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