This glossary focuses primarily on U.S. commercial roof systems. It includes roofing-specific acronyms, related construction abbreviations, and commonly encountered units and designations. No single list covers every manufacturer’s shorthand or every regional convention. Where meanings differ, the project’s abbreviation legend, specifications, and product documentation take precedence.
Definitions explain terminology; they do not replace project-specific design, code requirements, safety procedures, or warranty terms. Legacy names are included because they still appear in existing-roof records.
Browse: A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z
A
What does AB stand for in commercial roofing?
AB can mean Air Barrier in enclosure specifications or Anchor Bolt on construction drawings. Use the project legend to identify the intended meaning.
What does A/C stand for on commercial roofing plans?
A/C stands for Air Conditioning. It identifies cooling equipment whose roof curbs, supports, and penetrations must be coordinated with the roofing work.
What does ACM stand for in commercial roofing?
ACM stands for Asbestos-Containing Material. It identifies material containing asbestos, which can occur in older roofing products. Suspected material requires appropriate assessment before disturbance.
What does AD stand for in commercial roofing?
AD can mean Adhered in a manufacturer’s roofing-system legend or Area Drain on drawings. The surrounding detail determines its meaning.
What does A/E stand for on commercial roofing plans?
A/E stands for Architect/Engineer. It identifies the design professional or design team responsible for project drawings and specifications.
What does AFF stand for on commercial roofing plans?
AFF stands for Above Finished Floor. It gives an installation height measured from the finished floor, rather than automatically from the roof surface.
What does AHJ stand for in commercial roofing?
AHJ stands for Authority Having Jurisdiction. It identifies the agency or official responsible for interpreting or enforcing applicable requirements for a project.
What does AHU stand for on commercial roofing plans?
AHU stands for Air Handling Unit. It identifies air-distribution equipment that may require a roof curb, structural support, and waterproof flashing.
What does AIA stand for in commercial roofing?
AIA stands for American Institute of Architects. It is a professional architecture organization whose contract documents and design resources are used in construction projects.
What does ALUM stand for on commercial roofing plans?
ALUM stands for Aluminum. It identifies a metal used for roof panels, copings, flashings, and other sheet-metal components.
What does ANSI stand for in commercial roofing?
ANSI stands for American National Standards Institute. Its name appears in designations for consensus standards used to evaluate roofing products and assemblies.
What does APP stand for in commercial roofing?
APP stands for Atactic Polypropylene. It is a polymer used to modify asphalt in certain commercial roofing membranes.
What does ARMA stand for in commercial roofing?
ARMA stands for Asphalt Roofing Manufacturers Association. It is an industry association representing asphalt roofing manufacturers and providing technical information about asphalt roofing.
What does ASCE stand for in commercial roofing?
ASCE stands for American Society of Civil Engineers. Its ASCE 7 standard addresses design loads that affect roof structures, coverings, and attachments.
What does ASD stand for in commercial roofing?
ASD stands for Allowable Stress Design. It is a structural design approach using specified load combinations and allowable capacities; it must not be mixed indiscriminately with strength-design values.
What does ASHRAE stand for in commercial roofing?
ASHRAE comes from American Society of Heating, Refrigerating and Air-Conditioning Engineers. The organization uses ASHRAE as its name and publishes standards relevant to building energy and enclosure performance.
What does ASTM stand for in commercial roofing?
ASTM comes from the former name American Society for Testing and Materials. The organization is now ASTM International and publishes material specifications and test methods used in roofing.
What does AVB stand for in commercial roofing?
AVB stands for Air and Vapor Barrier. In building-enclosure specifications, it identifies a material or assembly intended to control both air leakage and water-vapor diffusion.
B
What does BA stand for in commercial roofing?
BA means Ballasted in some manufacturer application legends. A ballasted roof uses specified stone or pavers to help hold the roof system in place.
What does BAPV stand for in commercial roofing?
BAPV stands for Building-Applied Photovoltaics. It describes solar equipment added to a building, such as panels mounted above an existing roof covering.
What does BIPV stand for in commercial roofing?
BIPV stands for Building-Integrated Photovoltaics. It describes solar-generating products that also function as part of the building envelope, such as integrated roof coverings.
What does BLKG stand for on commercial roofing plans?
BLKG stands for Blocking. It identifies support material, often wood, used at roof edges, curbs, openings, or attachment locations.
What does B.O. mean on commercial roofing plans?
B.O. means Bottom Of. It precedes the component used as an elevation reference, such as the bottom of a beam or deck.
What does BTU stand for in commercial roofing?
BTU stands for British Thermal Unit. It is a unit of heat energy used in insulation and building-energy calculations, also written Btu.
What does BUR stand for in commercial roofing?
BUR stands for Built-Up Roofing. It is a multilayer roof membrane assembled from reinforcing plies and bitumen, with a specified protective surfacing.
C
What does CA stand for in commercial roofing?
CA stands for Cold Applied. It identifies roofing material installed without heating it to application temperature in a kettle or similar equipment.
What does CAD stand for in commercial roofing?
CAD stands for Computer-Aided Design. It refers to software-based preparation of roof plans, details, and other construction drawings.
What does CBECxP stand for in commercial roofing?
CBECxP stands for Certified Building Enclosure Commissioning Provider. It is an IIBEC credential covering commissioning of building-enclosure systems, including roofs.
What does C&C stand for in commercial roofing?
C&C stands for Components and Cladding. Wind-design documents use it for elements such as roof coverings and their attachments, rather than the overall wind-resisting structure.
What does CFLG stand for on commercial roofing plans?
CFLG stands for Counterflashing. It identifies flashing that covers and protects the upper termination of base flashing at a wall or similar vertical surface.
What does CFM mean in commercial roofing measurements?
CFM stands for Cubic Feet per Minute. It measures airflow and appears in rooftop ventilation and mechanical-equipment information.
What does CGF stand for in commercial roofing?
CGF stands for Coated Glass Facer. It identifies a coated glass-fiber facing used on certain polyiso insulation and cover boards.
What does CI stand for in commercial roofing?
CI, often written ci, means Continuous Insulation in energy and enclosure specifications. It can instead mean Cast Iron on drainage drawings, so context matters.
What does C/L mean on commercial roofing plans?
C/L means Centerline. It marks the center of a drain, joint, equipment curb, or other feature for layout.
What does CMU stand for on commercial roofing plans?
CMU stands for Concrete Masonry Unit. It identifies concrete block used in walls or parapets that may receive roof flashings.
What does CO stand for in commercial roofing?
CO can mean Change Order in project administration or Cleanout on plumbing drawings. A change order documents an agreed contract change; a cleanout provides drainage access.
What does CONC stand for on commercial roofing plans?
CONC stands for Concrete. It identifies a material used in structural roof decks, equipment pads, pavers, or other building components.
What does CPE stand for in commercial roofing?
CPE stands for Chlorinated Polyethylene. It is a polymer associated with certain single-ply roofing membranes, particularly in older roof-system records.
What does CRCA stand for in commercial roofing?
CRCA stands for Canadian Roofing Contractors Association. It is a Canadian roofing industry association that publishes technical guidance and supports roofing contractors.
What does CRRC stand for in commercial roofing?
CRRC stands for Cool Roof Rating Council. It administers rating programs for radiative properties such as solar reflectance and thermal emittance.
What does CSI stand for in commercial roofing?
CSI stands for Construction Specifications Institute. It is an organization associated with construction-document practices and specification organization, including roofing specification sections.
What does CSM mean in commercial roofing?
CSM is a standardized rubber designation for Chlorosulfonated Polyethylene, also called CSPE. It may appear in specifications or identification records for legacy membranes.
What does CSPE stand for in commercial roofing?
CSPE stands for Chlorosulfonated Polyethylene. It is a synthetic polymer associated with legacy single-ply membranes, including products historically associated with the Hypalon name.
What does CTE stand for in commercial roofing?
CTE stands for Coefficient of Thermal Expansion. It describes how much a material changes dimension with temperature, affecting roof joints and metal detailing.
What does CTP stand for in commercial roofing?
CTP stands for Coal Tar Pitch. It is a bituminous material encountered in some older built-up roof systems. It should not be assumed interchangeable with roofing asphalt.
D
What do DET and DTL mean on commercial roofing plans?
DET and DTL mean Detail. They direct the reader to an enlarged drawing explaining a roof edge, drain, flashing, penetration, or other connection.
What does DFT stand for in commercial roofing?
DFT stands for Dry Film Thickness. It is the thickness of a coating after drying or curing, rather than its thickness immediately after application.
What does DIA stand for on commercial roofing plans?
DIA stands for Diameter. It gives the size across a circular pipe, drain, fastener, or other round component.
What does DL stand for in commercial roofing?
DL stands for Dead Load. It is the weight of permanent construction and fixed equipment, including the roof assembly.
What does DORA stand for in commercial roofing?
DORA stands for Directory of Roof Assemblies. It is SPRI’s resource for locating listed roof assemblies and associated wind-uplift resistance information.
What does DP stand for in commercial roofing?
DP stands for Design Pressure. It is the pressure used for design or product evaluation; roofing documents commonly use it for wind-uplift requirements.
What does DS stand for on commercial roofing plans?
DS stands for Downspout. It identifies a pipe or conductor carrying water from a roof gutter or collector toward a drainage system.
What does DWG stand for on commercial roofing plans?
DWG stands for Drawing. It identifies a project drawing or drawing reference used to communicate roofing layout and construction details.
E
What does EFVM stand for in commercial roofing?
EFVM stands for Electric Field Vector Mapping. It is a named low-voltage electrical method used to locate leaks in compatible roofing and waterproofing assemblies.
What does EIFS stand for in commercial roofing?
EIFS stands for Exterior Insulation and Finish System. It is an exterior wall system whose roof-to-wall transitions require compatible, coordinated flashing details.
What does EJ stand for on commercial roofing plans?
EJ stands for Expansion Joint. It identifies a joint intended to accommodate movement between building or roof sections.
What does EL stand for on commercial roofing plans?
EL stands for Elevation. It identifies a vertical level relative to the datum specified on the drawings.
What does ELD stand for in commercial roofing?
ELD stands for Electronic Leak Detection. It uses electrical testing to locate membrane breaches. The method must suit the membrane and underlying assembly.
What does EOR stand for in commercial roofing?
EOR stands for Engineer of Record. It identifies the engineer responsible for a defined portion of the project’s engineering design and documents.
What does EPD stand for in commercial roofing?
EPD stands for Environmental Product Declaration. It reports a product’s environmental impacts using a defined life-cycle assessment framework; it is not a blanket environmental approval.
What does EPDM stand for in commercial roofing?
EPDM commonly stands for Ethylene Propylene Diene Monomer. It is a synthetic-rubber single-ply membrane; technical rubber nomenclature describes it as ethylene propylene diene M-class rubber.
What does EPS stand for in commercial roofing?
EPS stands for Expanded Polystyrene. It is a rigid foam insulation used in some commercial roof assemblies, including certain tapered and lightweight insulating concrete systems.
What does ES-1 mean in commercial roofing?
ES-1 is a roofing-edge standard designation, not an ordinary acronym. ANSI/SPRI/FM 4435/ES-1 addresses edge systems used with low-slope roofing, including wind-resistance testing.
What does EVT stand for in commercial roofing?
EVT stands for Equiviscous Temperature. It is the temperature at which roofing asphalt reaches a specified application viscosity. It is not a universal temperature for every asphalt.
What does EXIST stand for on commercial roofing plans?
EXIST stands for Existing. It identifies construction or equipment already present, rather than work being newly installed.
F
What does FA stand for in commercial roofing?
FA commonly means Fully Adhered, describing a membrane bonded to a suitable substrate. On other building drawings, FA can mean Fire Alarm.
What does FB stand for in commercial roofing?
FB stands for Fleece Backed. It describes a roofing membrane with a factory-attached fleece underside used in specified attachment systems.
What does FBC stand for in commercial roofing?
FBC stands for Florida Building Code. It is Florida’s building-code framework. Roofing work must follow the applicable edition, approvals, and project requirements.
What does FM stand for in commercial roofing?
FM historically refers to Factory Mutual. Roofing references typically concern FM Approvals, tested assemblies, or FM property-loss prevention guidance rather than a roofing material.
What does FM 1-90 mean in commercial roofing?
FM 1-90 identifies an FM Class 1 roof assembly with a 90-psf wind-uplift test rating. It does not mean a 90-mph wind rating or directly establish the allowable project design pressure.
What does FR stand for in commercial roofing?
FR may mean Fire Resistant, Fire Retardant, or Fire Rating, depending on the document. A product label alone does not establish the fire classification of an entire roof assembly.
What does FRP stand for in commercial roofing?
FRP stands for Fiber-Reinforced Plastic. It is a composite plastic strengthened with fibers, sometimes used in roof panels, accessories, or equipment components.
What does FRT stand for in commercial roofing?
FRT stands for Fire-Retardant Treated. It describes wood treated to reduce its contribution to fire under specified conditions. It does not mean the wood is fireproof.
What does FT mean in commercial roofing measurements?
FT means Foot or Feet. It is a length unit used for roof dimensions, elevations, flashing lengths, and other measurements.
G
What do G60 and G90 mean in commercial roofing?
G60 and G90 are galvanized-steel coating designations. They indicate minimum average zinc coating masses of 0.60 and 0.90 ounces per square foot, respectively, totaling both sheet surfaces.
What does GA mean in commercial roofing?
GA means Gauge when describing sheet metal or wire. Specify the actual thickness as needed because gauge-to-thickness relationships depend on the material and gauge system.
What does GAL mean in commercial roofing measurements?
GAL means Gallon. It is a volume unit used for coatings, adhesives, and primers; product documentation should identify whether U.S. or imperial gallons are intended.
What does GALV stand for in commercial roofing?
GALV stands for Galvanized. It identifies steel protected with a zinc coating, commonly used for sheet-metal and fastening components.
What does GC stand for in commercial roofing?
GC stands for General Contractor. It identifies the contractor coordinating the overall construction project and the work of subcontractors.
What does GSM stand for on commercial roofing plans?
GSM stands for Galvanized Sheet Metal. It identifies zinc-coated sheet steel used in suitable flashing, trim, or related sheet-metal work.
What does GWP stand for in commercial roofing?
GWP stands for Global Warming Potential. It expresses a greenhouse gas’s warming effect relative to carbon dioxide over a stated time horizon and appears in environmental product reporting.
What does GYP stand for on commercial roofing plans?
GYP stands for Gypsum. It identifies a material used in certain roof cover boards, substrate boards, and other building components.
H
What does HA stand for in commercial roofing?
HA stands for Hot Applied. It identifies roofing materials installed using heat-softened or heated material, such as hot roofing asphalt.
What does HD stand for in commercial roofing?
HD stands for High Density. It commonly describes a denser insulation or cover-board product. The abbreviation alone does not establish strength or an assembly rating.
What does HP stand for on commercial roofing plans?
HP commonly means High Point on a tapered-insulation or drainage plan. In product names, it may instead mean High Performance and is manufacturer-specific.
What does HPD stand for in commercial roofing?
HPD stands for Health Product Declaration. It is a standardized report of building-product contents and associated health-hazard information, not a guarantee that a product is harmless.
What does HVAC stand for in commercial roofing?
HVAC stands for Heating, Ventilation, and Air Conditioning. It identifies building mechanical systems whose rooftop units, penetrations, and service routes affect roofing design and maintenance.
What does HVHZ stand for in commercial roofing?
HVHZ stands for High-Velocity Hurricane Zone. It identifies the Florida code region with special hurricane-related provisions, including roofing requirements.
What does HW stand for in commercial roofing?
HW stands for Heat Weldable. In certain manufacturer application legends, it identifies a membrane designed for heat-welded installation. The product instructions determine the permitted method.
I
What does IBC stand for in commercial roofing?
IBC stands for International Building Code. It is a model building code addressing construction, including roof assemblies. Local adoption and amendments determine the enforceable requirements.
What does ICC stand for in commercial roofing?
ICC stands for International Code Council. It develops model codes, including the International Building Code and International Energy Conservation Code.
What does ID stand for on commercial roofing plans?
ID means Inside Diameter when sizing pipes, drains, or circular openings. Elsewhere, it can mean Identification; check the context.
What does IECC stand for in commercial roofing?
IECC stands for International Energy Conservation Code. It is a model energy code that includes requirements affecting roof insulation and, in some cases, roof-surface properties.
What does IIBEC stand for in commercial roofing?
IIBEC stands for International Institute of Building Enclosure Consultants. It is a professional association covering roofing, waterproofing, and exterior-wall consulting and observation.
What does INSUL stand for on commercial roofing plans?
INSUL stands for Insulation. It identifies material intended to resist heat flow through the roof assembly.
What does IR stand for in commercial roofing?
IR stands for Infrared. In roof investigations, it commonly refers to thermal imaging used to identify temperature patterns that may warrant moisture investigation.
What does IRMA stand for in commercial roofing?
IRMA is used for Insulated Roof Membrane Assembly and Inverted Roof Membrane Assembly. Both usages describe an arrangement with insulation above the waterproofing membrane.
What does ISO mean in commercial roofing?
ISO commonly means Polyisocyanurate Insulation, also called polyiso. In references such as ISO 9001, ISO instead identifies the International Organization for Standardization.
What does IW stand for in commercial roofing?
IW stands for Induction Welded. It describes attachment in which induction heating bonds a membrane to compatible coated plates beneath it.
J
What does JHA stand for in commercial roofing?
JHA stands for Job Hazard Analysis. It is a task-based review used to identify hazards and select measures to control them before work proceeds.
What does JSA stand for in commercial roofing?
JSA stands for Job Safety Analysis. It is a structured review of work steps, their hazards, and controls, also commonly called a job hazard analysis.
K
What does KEE stand for in commercial roofing?
KEE stands for Ketone Ethylene Ester. It is a polymer modifier used in certain single-ply roofing membranes, including some PVC formulations.
What does kPa mean in commercial roofing measurements?
kPa means Kilopascal. It is a metric unit of pressure or stress used in wind, fastening, and material-strength data.
What does k-value mean in commercial roofing?
k-value means Thermal Conductivity. It describes heat flow through a material; a lower value means lower conductivity under the stated test conditions.
L
What does LCA stand for in commercial roofing?
LCA stands for Life-Cycle Assessment. It evaluates environmental impacts across defined stages of a product’s life, using stated assumptions and boundaries.
What does LEED stand for in commercial roofing?
LEED stands for Leadership in Energy and Environmental Design. It is a green-building rating system in which roofing choices can contribute to project strategies and credits.
What does LF mean in commercial roofing measurements?
LF stands for Linear Feet. It measures length, such as the quantity of coping, flashing, perimeter edge, or gutter, rather than area.
What does LL stand for in commercial roofing?
LL stands for Live Load. It is a load associated with use or occupancy rather than permanent construction. Roof live loads are identified separately where required.
What does Lr mean in commercial roof design?
Lr, also written Lᵣ, means Roof Live Load in structural load notation. It is distinct from dead, snow, rain, and wind loads.
What does LRFD stand for in commercial roofing?
LRFD stands for Load and Resistance Factor Design. It is a structural design approach that applies factors to loads and resistance. Its values must be interpreted on the correct design basis.
What does LTTR stand for in commercial roofing?
LTTR stands for Long-Term Thermal Resistance. It is a predicted long-term insulation R-value determined through specified testing and calculation procedures.
What does LWIC stand for in commercial roofing?
LWIC stands for Lightweight Insulating Concrete. It is a lightweight, insulating cementitious roof material that can provide slope and a membrane substrate in designed assemblies.
M
What does MA stand for in commercial roofing?
MA stands for Mechanically Attached. It describes a roof system secured with mechanical fasteners rather than relying only on membrane adhesion or ballast.
What does MAX mean on commercial roofing plans?
MAX means Maximum. It establishes the upper limit for a dimension, spacing, thickness, or other specified quantity.
What do MB and MOD BIT stand for in commercial roofing?
MB and MOD BIT mean Modified Bitumen. They describe bituminous roofing sheets modified with polymers, commonly SBS or APP, and are often used on flat roofing systems.
What does MC stand for in commercial roofing?
MC commonly means Moisture Content in roof-investigation and material-testing reports. The measurement method and reporting basis must be identified before values are compared.
What does MCA stand for in commercial roofing?
MCA stands for Metal Construction Association. It is an industry association providing technical resources for metal building products, including metal roofing.
What does MDI stand for in commercial roofing?
MDI stands for Methylene Diphenyl Diisocyanate. It is an isocyanate used in polyurethane chemistry, including spray foam and some roofing adhesives.
What does MEP stand for in commercial roofing?
MEP stands for Mechanical, Electrical, and Plumbing. It identifies building-service disciplines whose rooftop equipment and penetrations must be coordinated with the roof assembly.
What does MF stand for in commercial roofing?
MF stands for Mechanically Fastened. It identifies an attachment method using fasteners and associated plates, battens, or other specified components.
What does MFR stand for on commercial roofing plans?
MFR stands for Manufacturer. It identifies the company that produces a specified roofing material, product, or system component.
What does MH stand for in commercial roofing?
MH stands for Moderate Hail. It identifies an FM hail-resistance classification for tested roof assemblies, not a guarantee against all hail damage.
What does mil mean in commercial roofing?
A mil is one-thousandth of an inch, not a millimeter and not an acronym. A 60-mil membrane has a nominal thickness of 0.060 inch.
What does MIN mean on commercial roofing plans?
MIN means Minimum. It establishes the lower limit for a required dimension, thickness, overlap, clearance, or other quantity.
What does MSDS stand for in commercial roofing?
MSDS stands for Material Safety Data Sheet. It is the older name for chemical hazard documentation now generally provided in the standardized Safety Data Sheet format.
What does MVTR stand for in commercial roofing?
MVTR stands for Moisture Vapor Transmission Rate. It describes the rate of water-vapor passage through a material under stated conditions and is often used similarly to WVTR.
What does MWFRS stand for in commercial roofing?
MWFRS stands for Main Wind Force Resisting System. It identifies the structural system resisting overall wind forces, distinct from component-and-cladding checks for roof coverings and attachments.
N
What does N/A mean in commercial roofing documents?
N/A usually means Not Applicable. Some forms use it for Not Available, so the form’s instructions and context control its meaning.
What does NDL stand for in commercial roofing?
NDL stands for No Dollar Limit. It describes certain warranties without a stated dollar cap on covered repairs. Coverage still depends on the warranty’s terms, exclusions, and conditions.
What does NDT stand for in commercial roofing?
NDT stands for Nondestructive Testing. It describes investigation methods that evaluate a roof without initially cutting into it. Findings may still need targeted verification or sampling.
What does NFPA stand for in commercial roofing?
NFPA stands for National Fire Protection Association. It develops fire and life-safety codes and standards that may be referenced in roofing and construction requirements.
What does NOA stand for in commercial roofing?
NOA stands for Notice of Acceptance. In Florida roofing, it commonly refers to a Miami-Dade product approval document identifying an accepted product or assembly and its limitations.
What does NRCA stand for in commercial roofing?
NRCA stands for National Roofing Contractors Association. It is a roofing industry association providing technical guidance, education, training, and contractor resources.
What does NTS stand for on commercial roofing plans?
NTS stands for Not to Scale. It warns that a drawing or detail must not be measured as though its displayed proportions establish construction dimensions.
O
What does O.C. mean in commercial roofing?
O.C. means On Center. It states the distance between the centers of adjacent fasteners, supports, framing members, or other repeated components.
What does OD stand for on commercial roofing plans?
OD commonly means Outside Diameter for a pipe or round component. Some roof plans use it for Overflow Drain; check the drawing legend.
What does OFD stand for on commercial roofing plans?
OFD stands for Overflow Drain. It identifies a secondary drain intended to discharge water when the primary roof drainage path is obstructed or overwhelmed.
What does O&M stand for in commercial roofing?
O&M stands for Operations and Maintenance. It describes the instructions and records used to operate, inspect, maintain, and care for a completed roof system.
What does OSB stand for in commercial roofing?
OSB stands for Oriented Strand Board. It is an engineered wood panel used as roof sheathing in appropriate assemblies. Panel rating, thickness, and support requirements matter.
What does OSHA stand for in commercial roofing?
OSHA stands for Occupational Safety and Health Administration. It is the U.S. workplace-safety agency whose construction requirements apply to many commercial roofing activities.
P
What does PCF mean in commercial roofing measurements?
PCF stands for Pounds per Cubic Foot. It is a density unit used for materials such as insulation, spray foam, and lightweight concrete.
What does PDS stand for in commercial roofing?
PDS stands for Product Data Sheet. It summarizes a product’s properties, uses, limitations, and installation information. It does not replace the full system specification.
What does PE stand for in commercial roofing?
PE can mean Polyethylene in material specifications or Professional Engineer in project documentation. The surrounding text identifies whether a material or professional credential is intended.
What does PFAS stand for in roofing safety?
PFAS stands for Personal Fall Arrest System. In a safety plan, it describes a system designed to arrest a worker’s fall; it is unrelated to the environmental use of PFAS for certain chemicals.
What does PIB stand for in commercial roofing?
PIB stands for Polyisobutylene. It is a synthetic polymer used in certain waterproofing membranes, sealants, and related products.
What does PIMA stand for in commercial roofing?
PIMA stands for Polyisocyanurate Insulation Manufacturers Association. It is an industry association providing technical information about polyiso insulation and its use in building assemblies.
What does PIR stand for in commercial roofing?
PIR stands for Polyisocyanurate. It is a rigid foam insulation commonly called polyiso and widely used in commercial roof assemblies.
What does PLYWD stand for on commercial roofing plans?
PLYWD stands for Plywood. It identifies a wood-veneer panel used as roof sheathing, backing, or another specified substrate.
What does PMMA stand for in commercial roofing?
PMMA stands for Polymethyl Methacrylate. It is a resin used in certain liquid-applied roofing and waterproofing systems, often with reinforcing fleece.
What does PMR stand for in commercial roofing?
PMR stands for Protected Membrane Roof. It is a roof arrangement with insulation and protective overburden above the waterproofing membrane.
What does PPE stand for in commercial roofing?
PPE stands for Personal Protective Equipment. It includes equipment selected to protect workers from identified hazards, such as eye protection, gloves, and appropriate respiratory protection.
What does PSA stand for in commercial roofing?
PSA stands for Pressure-Sensitive Adhesive. It is an adhesive that develops a bond when compatible surfaces are pressed together, as used in certain tapes and membrane accessories.
What does PSF mean in commercial roofing measurements?
PSF stands for Pounds per Square Foot. It is a unit of load or pressure frequently used for roof dead loads, wind-uplift pressures, and assembly ratings.
What does PSI mean in commercial roofing measurements?
PSI stands for Pounds per Square Inch. It is a pressure or stress unit used in material tests, including some insulation compressive-strength ratings.
What does PT stand for on commercial roofing plans?
PT commonly means Pressure Treated when describing wood blocking or nailers. On structural concrete drawings, it can mean Post-Tensioned, so confirm the intended use.
What do PU and PUR stand for in commercial roofing?
PU and PUR mean Polyurethane. They identify a polymer family used in certain roof coatings, adhesives, sealants, and foam products.
What does PV stand for in commercial roofing?
PV stands for Photovoltaic. It describes solar-electric technology. Rooftop PV systems require coordination with roof attachments, access, drainage, and weatherproofing.
What does PVC stand for in commercial roofing?
PVC stands for Polyvinyl Chloride. It is a thermoplastic material used in single-ply roofing membranes with heat-welded seams. Roofing PVC is not the same product as PVC pipe.
What does PVDF stand for in commercial roofing?
PVDF stands for Polyvinylidene Fluoride. It is a fluoropolymer resin used in certain factory-applied paint finishes for metal roofing and architectural sheet metal.
Q
What does QA stand for in commercial roofing?
QA stands for Quality Assurance. It covers the planned procedures and responsibilities intended to help roofing work meet project requirements.
What does QC stand for in commercial roofing?
QC stands for Quality Control. It covers checks and tests used to confirm that installed materials and workmanship meet specified requirements.
What does QTY mean in commercial roofing estimates?
QTY means Quantity. It identifies the amount of material, equipment, or work included in an estimate, schedule, or order.
R
What does RBEC stand for in commercial roofing?
RBEC stands for Registered Building Enclosure Consultant. It is an IIBEC designation recognizing a professional who holds its roof, waterproofing, and exterior-wall consultant credentials.
What does RCABC stand for in commercial roofing?
RCABC stands for Roofing Contractors Association of British Columbia. It is a Canadian roofing association responsible for the Roofing Practices Manual and other regional industry resources.
What does RCI mean in commercial roofing?
RCI refers to the former Roof Consultants Institute, later known as RCI, Inc. The organization is now IIBEC; the older name remains in legacy documents.
What does RCMA stand for in commercial roofing?
RCMA stands for Roof Coatings Manufacturers Association. It is an industry association providing education and technical information about roof coatings.
What does RD stand for on commercial roofing plans?
RD stands for Roof Drain. It identifies a drainage fitting that receives water from the roof surface and connects to the drainage system.
What does REWC stand for in commercial roofing?
REWC stands for Registered Exterior Wall Consultant. It is an IIBEC credential relevant to exterior-wall consulting and roof-to-wall enclosure interfaces.
What does REWO stand for in commercial roofing?
REWO stands for Registered Exterior Wall Observer. It is an IIBEC credential for professionals who observe exterior-wall construction.
What does RFG stand for on commercial roofing plans?
RFG stands for Roofing. It is a drawing abbreviation identifying roofing material, a roofing assembly, or work assigned to the roofing scope.
What does RFI stand for in commercial roofing?
RFI stands for Request for Information. It is a formal request to clarify drawings, specifications, details, or other project information before proceeding with affected work.
What does RFP stand for in commercial roofing?
RFP stands for Request for Proposal. It invites a contractor or consultant to propose an approach, scope, and price for a roofing project or service.
What does RFQ stand for in commercial roofing procurement?
RFQ commonly means Request for Quotation. In qualifications-based selection, it can mean Request for Qualifications; the solicitation defines the intended meaning.
What does RH stand for in commercial roofing?
RH stands for Relative Humidity. It expresses the amount of water vapor in air relative to saturation at the same temperature and affects moisture and condensation analysis.
What does RRC stand for in commercial roofing?
RRC stands for Registered Roof Consultant. It is an IIBEC credential for professionals practicing roof consulting.
What does RRO stand for in commercial roofing?
RRO stands for Registered Roof Observer. It is an IIBEC credential for professionals who observe roofing work and document its relationship to project requirements.
What does RTU stand for on commercial roofing plans?
RTU stands for Rooftop Unit. It commonly identifies packaged mechanical equipment installed on a roof, usually requiring a coordinated curb and flashing assembly.
What does R-value mean in commercial roofing?
R-value means Thermal Resistance. It indicates resistance to heat flow; higher values mean greater resistance under the stated conditions, and whole-assembly performance differs from insulation-only values.
What does RWC stand for in commercial roofing?
RWC stands for Registered Waterproofing Consultant. It is an IIBEC credential for professionals practicing waterproofing consulting.
What does RWL stand for on commercial roofing plans?
RWL stands for Rainwater Leader. It identifies piping or a conductor carrying rainwater from roof drainage toward the building’s stormwater system.
S
What does SA stand for in commercial roofing?
SA stands for Self-Adhered. It describes roofing material with an adhesive underside designed to bond to a suitable prepared substrate, commonly after removing a release liner.
What does SBS stand for in commercial roofing?
SBS stands for Styrene-Butadiene-Styrene. It is an elastomeric polymer used to modify asphalt in certain commercial roofing membranes.
What does SCP stand for on commercial roofing plans?
SCP stands for Scupper. It identifies an outlet through a parapet or wall that allows water to leave the roof.
What does SDS stand for in commercial roofing?
SDS stands for Safety Data Sheet. It provides standardized information on a product’s hazards, handling, exposure controls, first aid, and emergency measures.
What does SEBS stand for in commercial roofing?
SEBS stands for Styrene-Ethylene-Butylene-Styrene. It is a synthetic block copolymer used in some elastomeric coatings, sealants, and related roofing products.
What does SF mean in commercial roofing measurements?
SF stands for Square Feet. It is an area measurement used for roof size, material quantities, and coverage rates. One roofing square equals 100 square feet.
What does SH stand for in commercial roofing?
SH stands for Severe Hail. It identifies an FM hail-resistance classification for tested roof assemblies, separate from moderate and very severe hail classifications.
What does SIP stand for in commercial roofing?
SIP stands for Structural Insulated Panel. It is a panel combining insulation with structural facings, used in certain roof and building-envelope systems.
What does SJI stand for in commercial roofing?
SJI stands for Steel Joist Institute. It is an industry organization associated with standards and technical guidance for steel joists supporting roofs and floors.
What does SMACNA stand for in commercial roofing?
SMACNA stands for Sheet Metal and Air Conditioning Contractors’ National Association. It publishes technical standards and guidance relevant to architectural sheet metal and roofing details.
What does SMP stand for in commercial roofing?
SMP stands for Silicone-Modified Polyester. It is a resin system used in some factory-applied metal-roof paint finishes, distinct from PVDF finishes.
What does SOW stand for in commercial roofing?
SOW commonly means Scope of Work or Statement of Work. It defines the work included in a roofing project, contract, proposal, or repair authorization.
What does SPF stand for in commercial roofing?
SPF stands for Spray Polyurethane Foam. It is a site-applied foam that can provide roof insulation and form part of a roofing system with specified protective surfacing.
What does SPFA stand for in commercial roofing?
SPFA stands for Spray Polyurethane Foam Alliance. It is an industry association providing spray-foam technical resources, education, and professional certification programs.
What does SPRI stand for in commercial roofing?
SPRI stands for Single Ply Roofing Industry. It is a commercial roofing industry association that develops standards and publishes technical guidance.
What does SQ mean in commercial roofing measurements?
SQ means Roofing Square. One square equals 100 square feet of roof area; it is not the same as one square foot.
What does SR stand for in commercial roofing?
SR stands for Solar Reflectance. It is the fraction of incoming solar radiation reflected by a surface. It is distinct from thermal emittance and Solar Reflectance Index.
What does SRI stand for in commercial roofing?
SRI stands for Solar Reflectance Index. It is a calculated indicator using solar reflectance and thermal emittance. It is not a percentage and can exceed 100.
What does SRL stand for in commercial roofing?
SRL stands for Self-Retracting Lifeline. It is a fall-protection device that pays out and retracts line and can lock to arrest a fall when used in a suitable system.
What does SS stand for in commercial roofing?
SS commonly means Stainless Steel in material notes. It may mean Standing Seam in a roof-system description, so the project legend and context matter.
What does SSMR stand for in commercial roofing?
SSMR stands for Standing Seam Metal Roof. It describes a metal roofing system with raised panel seams, commonly secured with concealed clips or fastening features.
What does SSR stand for in commercial roofing?
SSR stands for Standing Seam Roof. It usually describes a metal roof with raised seams between adjacent panels. Seam configuration and attachment depend on the specific system.
What does SST mean on commercial roofing plans?
SST means Stainless Steel. It identifies the material for a specified flashing, fastener, drain component, or other item.
T
What does T&B mean on commercial roofing plans?
T&B means Top and Bottom. It indicates that a requirement applies to both surfaces, edges, or locations identified by the detail.
What does TDS stand for in commercial roofing?
TDS stands for Technical Data Sheet. It provides product performance, application, and limitation information. Manufacturers may use this label similarly to Product Data Sheet.
What does TE stand for in commercial roofing?
TE stands for Thermal Emittance. It is a surface’s ability to release heat as thermal radiation compared with an ideal emitter at the same temperature.
What does T&G stand for in commercial roofing?
T&G stands for Tongue and Groove. It describes interlocking panel or board edges used in some roof-deck and sheathing products.
What does T&M stand for in commercial roofing?
T&M stands for Time and Materials. It describes a pricing arrangement based on documented labor and materials, subject to the contract’s rates and terms.
What does T.O. mean on commercial roofing plans?
T.O. means Top Of. It precedes the component used as an elevation reference, such as the roof, deck, slab, or steel.
What does TOP mean on commercial roofing plans?
TOP can mean Top of Parapet when used as an elevation abbreviation. The project legend must distinguish it from the ordinary word top.
What does TOR mean on commercial roofing plans?
TOR commonly means Top of Roof. It identifies a roof elevation, but the drawing must establish which roof surface or layer is intended.
What does TOS mean on commercial roofing plans?
TOS can mean Top of Steel or Top of Slab. The structural drawings and abbreviation legend establish the correct elevation reference.
What does TPO stand for in commercial roofing?
TPO stands for Thermoplastic Polyolefin. It is a thermoplastic single-ply roofing membrane commonly installed with heat-welded seams.
What does TYP mean on commercial roofing plans?
TYP means Typical. It indicates that a note or detail applies to similar conditions unless another requirement is specifically shown.
U
What does UL stand for in commercial roofing?
UL comes from Underwriters Laboratories. In roofing documents, it typically identifies UL testing, standards, or certifications; the specific listing establishes what was evaluated.
What does UON mean on commercial roofing plans?
UON means Unless Otherwise Noted. It makes a general requirement subject to a more specific note or detail elsewhere in the documents.
What does USGBC stand for in commercial roofing?
USGBC stands for U.S. Green Building Council. It is the organization associated with the LEED green-building rating system.
What does UV stand for in commercial roofing?
UV stands for Ultraviolet. It identifies a portion of solar radiation that can contribute to weathering and deterioration of exposed roofing materials.
What does U-value mean in commercial roofing?
U-value means Thermal Transmittance. It describes heat flow through an assembly per unit area and temperature difference; lower values indicate less heat transfer.
V
What does VB stand for in commercial roofing?
VB stands for Vapor Barrier. It identifies a layer intended to greatly restrict water-vapor diffusion. The specified permeance or class is more precise than the label alone.
What does VCL stand for in commercial roofing?
VCL stands for Vapor Control Layer. It identifies a layer intended to control vapor movement through a building assembly; its required properties depend on the design.
What does VIF stand for on commercial roofing plans?
VIF stands for Verify in Field. It directs the contractor or project team to confirm actual site dimensions or conditions rather than relying solely on the drawing.
What does VOC stand for in commercial roofing?
VOC stands for Volatile Organic Compound. It identifies a class of organic chemicals relevant to emissions, exposure, and product regulations for coatings, adhesives, primers, and sealants.
What does VR stand for in commercial roofing?
VR stands for Vapor Retarder. It identifies a material that restricts water-vapor diffusion. Its permeance and location must suit the roof assembly and conditions.
What does VSH stand for in commercial roofing?
VSH stands for Very Severe Hail. It identifies an FM hail-resistance classification for tested roof assemblies. It does not guarantee that a roof cannot be damaged by hail.
What does VTR stand for on commercial roofing plans?
VTR stands for Vent Through Roof. It identifies a plumbing vent or similar vent pipe passing through the roof and requiring an appropriate flashing.
W
What does WB stand for in commercial roofing?
WB commonly means Water Based in coating, primer, and adhesive descriptions. It identifies the carrier type, not a guarantee of zero emissions or universal compatibility.
What does WBL mean on commercial roofing plans?
WBL means Wood Blocking. It identifies wood supports used at edges, curbs, openings, or other detailed roof conditions.
What does WFT stand for in commercial roofing?
WFT stands for Wet Film Thickness. It is the thickness of a liquid roof coating immediately after application, before drying or curing changes its thickness.
What does WRB stand for in commercial roofing?
WRB stands for Water-Resistive Barrier. It identifies a barrier used to manage water behind exterior cladding. Roof-to-wall flashings must coordinate with it; it is not automatically an air or vapor barrier.
What does WVTR stand for in commercial roofing?
WVTR stands for Water Vapor Transmission Rate. It measures vapor passage per unit area and time under stated test conditions; vapor permeance additionally accounts for the vapor-pressure difference.
X
What does XPS stand for in commercial roofing?
XPS stands for Extruded Polystyrene. It is a rigid foam insulation used in certain roof assemblies, including many protected membrane roofs.
Y
What does YR mean in commercial roofing documents?
YR means Year. It commonly appears in roof-age records, maintenance schedules, and warranty periods; a stated term does not describe all coverage conditions.
Z
What does Z275 mean in commercial roofing?
Z275 is a galvanized-steel coating designation, not an acronym. It indicates a minimum average zinc coating mass of 275 grams per square meter, totaling both sheet surfaces.
