Thermal conductivity.

Cantare

Council of American Building Officials, 5203 Leesburg Pike, Suite 708, Falls Church, VA 20041.

(1) A machine normally composed of three counter-rotating steel roofs of large diameter; a device used to produce film and sheet goods which are normally wound up into roll stock; (2) A machine with two or more counter-rotating steel rollers used for laminating sheeting or skim coating (topping) to a controlled thickness or surface characteristic or both; (3) A precision machine equipped with three or more heavy internally heated or cooled rolls, revolving in opposite directions. Used for preparation of continuous sheeting or plying up compounds.

A manufacturing process by which some polymeric membranes and other sheetings are produced.

The amount of heat required to raise one gram of water 1? C.

(1) A slight convex curve of a surface, such as in a prestressed concrete deck; (2) A predetermined curvature designed into a structural member to offset the anticipated deflection when loads are applied.

(1) Any overhanging or projecting roof structure, typically over entrances or doors. Sometimes the extreme end is unsupported; (2) A fixed rooflike structure projecting from a building that is supported by cantilevering or support rods.

A beveling of foam at a right angle joint for strength and water run off.

A projecting beam that is supported and restrained at one end only; a fixed support condition.

(1) A continuous strip of material (triangular in cross-section) used as a transition piece between the roof deck and a vertical surface, normally has a 45? sloping surface; (2) A beveled strip used under flashing to modify the angle at the point where the roofing or waterproofing membrane meets any vertical element; (3) A beveled strip of wood or wood fiber that fits into the angle formed by the intersection of a horizontal surface and a vertical surface. The 45? slope of the exposed surface of the cant strip provides a gradual angular transition form the horizontal surface to the vertical surface; (4) A beveled or triangular-shaped strip of wood, wood fiber, perlite or other material designed to serve as a gradual transitional plane between the horizontal surface of a roof deck or rigid insulation and a vertical surface; (5) A continuous strip of wood or fiber, fitted into an angle formed at the intersection of a horizontal surface and a vertical surface.

The quantitative measure of electric-energy storage capability; the voltage potential difference between two conducting elements separated by a nonconductor.

(1) A device used for roof moisture surveys that measures the ratio of the charge to the potential difference between two conducting elements separated by a nonconductor. (2) A device used to locate moisture or wet materials within a roof system by measuring the ratio of the change to the potential difference between two conducting elements separated by a non conductor.

(1) Connecting devices that seal membrane joints at walls, expansion joints, drains, gravel stops, and other places where the membrane is interrupted. Cap Flashing shields the exposed edges and joints of the base flashing; (2) Usually composed of metal, used to cover or shield the upper edges of the membrane base flashing, wall flashing or primary flashing. See FLASHING and COPING.

(1) A force that is the result of adhesion, cohesion, and surface tension in liquids which are in contact with solids, as in a capillary tube, when the cohesive force is greater, the surface of the liquid tends to rise in the tube, as with mercury, when the adhesive force is greater, the surface tends to be depressed, as with water. (2) The action that causes movement of liquids by surface tension when in contact with two adjacent surfaces such as panel side laps.

The action by which the surface of a liquid (where it is in contact with a solid) is elevated or depressed, depending upon the relative attraction of the molecules of the liquid for each other and for those of the solid.

The cost of acquiring, substantially improving, expanding, changing the functional use of, or replacing a building or building system.

(1) A granule-surfaced coated sheet used as the top ply of some built up or modified bitumen roof membranes and/or flashing; (2) Mineral-surfaced coated felt used as the top ply of a built-up roof membrane.

Turrets and battlements, usually decorative, as built on a castle.

An emulsion in which the emulsifying system establishes a predominance of positive charges on the discontinuous phase.

(1) To seal joints, seams or voids by filing with a waterproofing compound or material; (2) To fill a joint with mastic or asphalt cement to prevent leaks; (3) A material (usually a composition of vehicle and pigment) used for filling/sealing joints or juncture, where no elastomeric properties are required. See SEALANT.

A substance that causes or changes the rate of a chemical reaction.

A composition of vehicle and pigment, used at ambient temperatures for filling joints, that remains plastic for an extended time after application.

(1) A wall built of masonry units arranged to provide a continuous air space within the wall (with or without insulating material) and in which the inner and outer widths of the wall are tied together with metal ties or headers; (2) A wall built or arranged to provide an air space within the wall (with or without insulating material), in which the inner and outer materials are tied together by structural framing.

Chromated copper arsenate.

100 cubic feet.

Certified Document Technologist

A poured-in-place roof deck material that is composed of Portland cement, water, a foaming agent and air. Its dry density is 30-40 pounds per cubic foot.

Thermoplastic, natural polymer of wood and cotton. Cellulose acetate for tool handles. Wide service temperature range.

See ASPHALT PLASTIC ROOF CEMENT.

Treated wood fibers bonded together with Portland cement, or other resinous or cementitious type binder, which are compresses and molded to form a structural material. Trade names are TECTUM and Insul-Rock.

(1) Unit measurement of viscosity=centistokes X specific gravity. (2) A unit of measure of absolute viscosity. (Note: The viscosity of water is one centipoise. The lower the number, the less the viscosity).

(1) Unit of viscosity (antonym of fluidity). Water has a viscosity of roughly 1 cSt, light cooking oil 100 cSt; (2) A unit of measure of absolute viscosity. (Note: The viscosity to the density of that liquid.)

Construction Engineering Research Laboratory

Former title of what is now Registered Roof Consultant. Change to latter in April 1993. See REGISTERED ROOF CONSULTANT.

Breaking of chemical bonds between carbon atoms by ultraviolet photo-oxidation resulting in embrittlement and cracking, a reversal of the asphalt-blowing polymerization process that produces long hydrocarbon chains.

A powdery residue on the surface of a material.

(1) A powdery residue on the surface of a material resulting from degradation or migration of an ingredient, or both; (2) The degradation or migration of an ingredient, in paints, coatings or other materials.

A line made on the roof by snapping a taut string or cord dusted with chalk. Used for alignment purposes

A measurement of performance for paint systems; the ability to resist a dusty/chalk appearance over time.

A mopping pattern in which hot bitumen is applied to parallel bands. See MOPPING and STRIP MOPPING.

The transient current which flows to charge a capacitor.

Similar to fire wall (MB).

(1) Family of polymers produced by chemical reaction of chlorine on the linear backbone chain of polyethylene. The resultant rubbery thermoplastic elastomers presently contain 25 40 percent chlorine by weight and 0 to 25 percent crystallinity. CPE can be vulcanized, but is usually used in a nonvolcanized form; (2) A thermoplastic sheet composed of molecular weight, low density polyethylene that has been chlorinated to a given level; (3) A thermoplastic material, used for single-ply roof membranes, composed of high molecular weight polyethylene which has been chlorinated—A process that yields a flexible rubber-like material.

(Probably best known by the DuPont trade name Hypalon) (1) Family of polymers that are produced by polyethylene reacting with chlorine and sulfur dioxide. Present polymers contain 25 to 43 percent chlorine and 1.0- to 1.4 percent sulfur. They are used is both vulcanized and nonvulcanized forms. Most membranes based on CPSE are nonvulcanized. ASTM designation for this polymer is CSM; (2) A synthetic, rubber-like thermoset material, based on high molecular weight polyethylene with suphonyl chloride, usually formulated to produce a self-vulcanizing membrane. Classified by ASTM Standard D 5019 89; (3) Basically a chlorinated polyethylene containing chloro sulphonyl groups with a high molecular weight, low-density polyethylene. Also known as CPE, CSPE, CSM and HYPALON.

(1) A principal member of a truss which extends from one end to the other, primarily to resist bending; (2) The straight line between two points on a curve; (3) The span of an arch.

Acronym for the International Council for Building Research Studies and Documentation (Counsel International du Batiment pour la Recherche, l'Etude et la Documentation).

A material used as the exterior wall enclosure of a building.

Method of mechanical attachment.

The highest fire-resistance rating for roofing as per ASTM E 108. Indicates roofing is able to withstand severe exposure to fire originating form sources outside the building.

A metal strip, plate or metal angle piece, either continuous or individual ("clip"), used to secure two or more components together.

An upward extension of enclosed space created by carrying a setback vertical wall (typically glazed) up and trough the roof slope. Two intersecting shed roofs on different planes.

An individual (discrete) cleat. See CLEAT.

A method of valley treatment in which shingles form one side of the valley extend across the valley while shingles from the other side are trimmed two inches (2") from the valley centerline. The valley flashing is not exposed.

(1) A resilient strip of a material such as neoprene, flat on one side and formed to the contour of ribbed sheets on the other, used to close openings created by joining metal sheets and flashings; (2) A metal or resilient strip such as neoprene foam, used to close openings created by joining metal panels or sheets and flashings.

Centimeter

Centralized Master Bidders List

(1) A dark brown to black cementitious material produced by the destructive distillation of coal; (2) Tar derived from the destructive distillation of coal during the conversion of coal into coke; (3) A dark brown to black, semi solid hydrocarbon obtained as residue from the partial evaporation or distillation of coal tar; (4) A coal-tar used as the waterproofing agent in below-grade structures, conforming to ASTM Specification D 450, Type II. See PITCH.

(1) A coal-tar used as the waterproofing agent in dead-level or low slope built-up roof membrane, conforming to ASTM D450, Type III; (2) A dark brown to black, semi-solid hydrocarbon formed as a residue from the partial evaporation or distillation of coal tar. It is used as the waterproofing agent in dead-level or low-slope built-up roofs. It differs from Coal-tar Pitch in having a lower front-end volatility; (3) A proprietary trade name for Type III coal tar used as the dampproofing or waterproofing agent in dead level or low-slope built-up roof membranes. (For specification properties, see ASTM Standard D450, Type III.)

A felt that has been saturated with refined coal-tar. See TARRED FELT.

(1) A dark brown to black, semi-solid hydrocarbon formed as a residue from the partial evaporation or distillation of coal-tar. It is used as the waterproofing agent in deal-level or low-slope built up roofs. (For specification properties, see ASTM Standard D 450, Types I and II.); (2) Dark brown to black solid hydrocarbon obtained from the residuum of distilled coke-oven tar, used as the waterproofing agent of dead-level or low-slope built-up roof membranes; (3) A coal-tar used as the waterproofing agent in dead-level or low slope built-up roof membrane, conforming to ASTM Specification D 450, Type I or Type III.

A trowelable mixture of processed coal-tar base, solvents, mineral fillers and/or fibers. Classified by ASTM Standard D 4022 Coal-tar Roof Cement.

A coal-tar used as the dampproofing or waterproofing agent in below-grade structures, conforming to ASTM Specification D450, Type II.

A felt that has been impregnated and saturated with asphalt and then coated on both sides with harder, more viscous asphalt to increase its impermeability to moisture; a parting agent is incorporated to prevent the material from sticking in the roll.

Fabrics that have been impregnated and/or coated with a plastic like material in the form of a solution, dispersion hot-melt or powder. The term also applies to materials resulting from the application of a preformed film to a fabric by means of calendering.

(1) An asphalt-saturated felt that has also been coated on both sides with harder, more viscous "coating" asphalt; (2) A glass fiber felt that has been simultaneously impregnated and coated with asphalt on both sides.

A layer of viscous asphalt applied to the base material into which granules or other surfacing is embedded.

A mathematical formulation used to predict the change in dimension (typically length) of a material as a function of
temperature change.

The application of a finish to a coil of metal using a continuous mechanical coating process.

Relatively slow deformation of a material at or below room temperature. See CREEP.

The process of using press brakes, roll formers, etc., to shape metal into desired profiles at ambient room temperature.

(1) A continuous, semi-flexible roof membrane, consisting of a ply or plies of felts, mats or other reinforcement fabrics that are laminated together with alternate layers of liquid applied (usually asphalt solvent based) roof cements or adhesives installed at ambient or a slightly elevated temperature; (2) A continuous, semi-flexible roof membrane, consisting of plies of felts, mats or fabrics that are laminated on a roof with alternate layers of cold applied roof cement and surfaced with a cold applied coating; (3) Bituminous membrane comprising layers of coated felts bonded with cold-applied asphalt roof cement and surfaced with a cutback or emulsified asphalt roof coating.

The process of forming steel into sheets, panels or shapes on a series of rollers at ambient room temperatures.

Preformed flange placed over a vent pipe to seal the roof around the vent pipe opening. Also called a vent sleeve.

See CONDUCTOR HEAD.

Manufactured by Vincent Metals -- Finished with a 70% Kynar finish

The ability of the membrane or material to retain its original color and reflectivity as it weathers.

A primary structural member used in a vertical position in a building to transfer loads from horizontal structural members (e.g., main roof beams, trusses or rafters) to the foundation/footing.

A category of roofing membranes made by blending thermoplastic resins with plasticizers, various modifiers, stabilizers, flame retardants, UV absorbers, fungicides, and other proprietary substances, alloyed with proprietary organic polymers. Some of the membranes listed in this generic category are CPA, EIP, NBP and TPA.

Subjecting a material to a load which will tend to compress or push the material together; the opposite of tension.

The ability of materials and components to resist deformation or other damage caused by the weight of compression of either live or dead loads.

The conversion of water vapor or other gas to liquid state as the temperature drops or the atmospheric pressure rises. See DEW POINT.

(1) An adhesive used to bond materials together; normally a phenolic-neoprene mixture which needs air to cure before joining the cement-coated surfaces together; (2) Adhesives used to adhere or bond various roofing components. These adhesives adhered mated components immediately on contact of surfaces to which the adhesive had been applied.

The covering piece placed on top of a wall which is exposed to the weather, usually made of metal, masonry or stone. It is preferably sloped to shed water back onto the roof.

The product of polymerization of two or more substances at the same time; a "mixed" polymer.

A chemical reaction that results in the bonding of two or more dissimilar monomers to product large, long-chain molecules which are copolymers.

Generic term for "metal deck".

Any nonferrous metal or any metal having an unbroken surfacing of nonferrous metal, or steel with not less than 10% chromium or with not less than 0.20% copper.

Vertical wood strips installed on sloped roofs over which horizontal battens are secured. The primary roof covering is attached or secured to these horizontal battens

(1) Formed metal or elastomeric sheeting secured on or into a wall, curb, pipe, rooftop unit or other surface, to cover and protect the upper edge of the membrane base flashing or underlying metal flashing and its associated fasteners from exposure to the weather; (2) That portion of the flashing attached to a vertical surface to prevent water from migrating behind the base flashing. See FLASHING.

(1) The term used for each application of material that forms the waterproofing system or the flashing; (2) One layer of a series of materials applied to a surface (i.e., a five-course wall flashing is composed of three applications of mastic with one ply of felt sandwiched between each layer of mastic); (3) A row of shingles or roll roofing running the length of the roof; (4) The term used for each row of shingles of roofing material that forms the roofing, waterproofing or flashing system; (5) One layer of a series of materials applied to surface (e.g., a five-course wall flashing is composed of three applications of roof cement with one ply of felt or fabric sandwiched between each layer of roof cement).

(1) The surface area (in square feet) to be continuously covered by a specific quantity of a particular roofing material, with allowance made for a specific lap; (2) Amount of weather protection provided by the roofing material. Depends on number of layers of material between the exposed surface of the roofing and deck; i.e., single coverage, double coverage, etc

A metal strip installed over the joint between formed metal pieces.

Copolymer alloy.

Basically a chlorinated polyethylene containing chloro sulphonyl groups with a high molecular weight, low-density polyethylene. See CHLORINATED POLYETHYLENE, CSPE and HYPALON.

(1) A separation or fracture occurring in a roof membrane or roof deck, generally caused by thermally induced stress or substrate movement; (2) Membrane fracture produced by bending, often at a ridge; (3) A non-linear separation or fracture occurring in a material. May be generally caused by induced stress, dimensional instability or substrate movement. Some cracks may be more of a linear separation or fracture. See RIDGING and SPLIT.

(1) The permanent deformation of a roofing material or roof system caused by the movement of the roof membrane that results from a combination of thermal stresses and mechanical loading; (2) The permanent deformation of a roof system caused by movement of the roof membrane or compression of a roof insulation board at fastener positions, that results from continuous load or thermal stress or loading. Creep at roof temperature is sometimes called "cold flow"; (3) Permanent elongation or shrinkage of the membrane resulting from thermal or moisture changes; (4) Permanent deflection of structural framing or structural deck resulting from plastic flow under continued stress or dimensional changes accompanying changing moisture content or temperature.

(1) A relatively small, elevated area of a roof constructed to divert water around a chimney, curb or other projection; (2) A superimposed construction placed in a roof area to assist drainage (See NRCA Construction Detail P); (3) Ridge built up in a level valley or perimeter to direct rainwater to a drain; (4) An elevated roof substrate or structure, constructed to divert water around a chimney, curb, away from a wall, expansion joint or other projection/penetration; (5) A peaked saddle construction at the back of a chimney to prevent accumulation of snow and ice and to deflect water around the chimney. See SADDLE.

The formation of chemical bonds between polymeric chains to yield an insoluble, three dimensional polymeric structure. Crosslinking of rubber is referred to as vulcanization or "curing".

The effect that is provided when air moves through a roof cavity between the vents.

Cold Regions Research and Engineering Laboratory

Construction Specifications Institute

ASTM designation for chlorosulfonated polyethylene. See CSPE.

Basically a chlorinated polyethylene containing chloro sulphonyl groups with a high molecular weight, low-density polyethylene. See CHLOROSULFONATED POLYETHYLENE, CPE and HYPALON.

(1) A raised member used to support roof penetrations, such as skylights, mechanical equipment, hatches, etc. above the level of the roof surface; (2) a raised roof perimeter relatively low in height.

A process where a material is caused to form permanent molecular linkages by exposure to chemicals, heat, pressure and/or weathering.

The conversion of a material from a thermoplastic to a thermoset by applying heat and/or chemicals.

Concrete that has attained its intended design performance properties.

Final step in the irreversible polymerization of a thermosetting plastic, usually requiring some combination of heat, radiation and pressure.

Membrane defect characterized by a continuous, open longitudinal seam with top felt rolled back from underlying felt.

(1) Solvent-thinned bitumen used in cold-applied ("process") roofing adhesives, flashing and roof cements and roof coatings; (2) Any bituminous roofing material that has been solvent thinned. Cutbacks are used in cold-process roofing adhesives, flashings cements and roof coatings.

(1) A detail designed to prevent lateral water movement into the insulation where the membrane terminates at the end of a day's work, or used to isolate sections of the roofing system. It is usually removed before the continuation of the work; (2) A permanent detail designed to seal and prevent lateral water movement in an insulation system, and used to isolate sections of a roofing system. (Note: a cutoff is different from a tie-off, which may be a temporary or permanent seal.); (3) A material seal that is designed to prevent lateral water movement into the edge of a roof system where the membrane terminates at the end of a day's work or used to isolate sections of the roof system. Cutoffs are usually removed before the continuation of work. See TIE-OFF and WATER CUTOFF.

The open portions of a strip shingle between the tabs.