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Title: Section 1502  •  Size: 9555

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SECTION 1502 - DEFINITIONS

For purposes of this chapter certain terms are designated as follows:

BASE PLY is one layer of felt secured to the deck over which a built-up roof is applied.

BASE SHEET is a product used as the base ply in a built-up roofing membrane.

BUILT-UP ROOF COVERING is two or more layers of felt cemented together and surfaced with cap sheet, mineral aggregate, smooth coating or similar surfacing material.

CAP SHEET is roofing made of organic or inorganic fibers, saturated and coated on both sides with a bituminous compound, surfaced with mineral granules, mica, talc, ilmenite, inorganic fibers or similar materials.

CEMENTING is solidly mopped application of asphalt, cold liquid asphalt compound, coal tar pitch or other approved cementing material.

COMBINATION SHEET is a glass fiber felt integrally attached to kraft paper.

CORROSION-RESISTANT is any nonferrous metal or any metal having an unbroken surfacing of nonferrous metal, or steel with not less than 10 percent chromium or with not less than 0.20 percent copper.

EQUIVISCOUS TEMPERATURE (EVT) is the temperature determined by the manufacturer at which the asphalt has a viscosity of 125 centistrokes and is considered to be the proper temperature for asphalt applications.

FELT is matted organic or inorganic fibers, saturated or coated with bituminous compound.

FELT, NONBITUMINOUS SATURATED, is a felt for special-purpose roofing weighing not less than 12 pounds per 100 square feet (0.6 kg/), not less than 0.022 inch (0.56 mm) in thickness, containing a fire- and water-retardant binder, and reinforced with glass fibers running lengthwise of the sheet not more than 1/4 inch (6.4 mm) apart.

FIRE-RETARDANT SHAKES AND SHINGLES are wood shakes and shingles complying with U.B.C. Standard 15-3 or 15-4 impregnated by the full-cell vacuum-pressure process with fire-retardant chemicals, and have been qualified by U.B.C. Standard 15-2 for use on Class A, B or C roofs. Each bundle of treated wood shakes and shingles shall bear labels identifying their roof-covering classification and approved quality control agency.

INTERLAYMENT is a layer of felt or nonbituminous saturated felt not less than 18 inches (457 mm) wide, shingled between each course of roof covering.

INTERLOCKING ROOFING TILES are individual units, typically of clay or concrete, possessing matching ribbed or interlocking vertical side joints that have been designed to restrict lateral movement and water penetration.

METAL ROOFING is metal shingles or sheets for application on solid roof surfaces, and corrugated or otherwise shaped metal sheets or sections for application on roof frameworks or on solid roof surfaces.

MODIFIED BITUMEN MEMBRANE ROOF COVERING is one or more layers of polymer modified asphalt sheet membranes complying with U.B.C. Standard 15-6. The sheet materials may be fully adhered or mechanically attached to the substrate or held in place with an appropriate ballast layer.

ROOF-COVERING CLASSIFICATION is the classification assigned to a roof covering or roof-covering assembly by Section 1504 or the classification of a covering established by testing in accordance with U.B.C. Standard 15-2.

ROOFING PLY is a layer of felt in a built-up roofing membrane.

ROOFING SQUARE is 100 square feet (9.3 ) of roofing surface.

ROOFING TILES are units, typically clay or concrete, which comply with U.B.C. Standard 15-5.

SPOT CEMENTING is discontinuous application of asphalt, cold liquid asphalt compound, coal tar pitch or other approved cementing material.

THERMOPLASTIC MEMBRANE ROOF COVERING is a sheet membrane composed of polymers and other proprietary ingredients, in compliance with U.B.C. Standard 15-6, whose chemical composition allows the sheet to be welded together by either heat or solvent throughout its service life.

THERMOSET MEMBRANE ROOF COVERING is a sheet membrane composed of polymers and other proprietary ingredients, in compliance with U.B.C. Standard 15-6, whose chemical composition vulcanizes or crosslinks during manufacture or during its service life.

UNDERLAYMENT is one or more layers of felt, sheathing paper, nonbituminous saturated felt, or other approved material over which a roofing system is applied.

VAPOR RETARDER is a layer of material or a laminate used to appreciably reduce the flow of water vapor into the roofing system.

WOOD SHAKES are tapered or nontapered pieces of approved durable wood of random widths ranging from 4 inches to 14 inches (102 mm to 356 mm) and of the following four types:

1. Hand split and resawn: tapered with one sawed and one split face; semisplit: tapered with partially sawn and split faces both sides, 15 inches (380 mm), 18 inches (455 mm) or 24 inches (610 mm) in length.

2. Taper split: tapered with both split faces, 24 inches (610 mm) in length.

3. Straight split: nontapered with both split faces, either 18 inches (455 mm) or 24 inches (610 mm) in length.

4. Tapersawn: sawn both sides, edges sawn or split. Lengths 24 inches (610 mm) and longer.

Wood Shakes (treated) are taper-sawn pieces of southern pine, black gum/sweetgum wood treated in accordance with approved national standards of random widths ranging from 4 inches to8 inches (100 mm to 200 mm) and lengths of 18 inches (455 mm) or 24 inches (610 mm). Maximum weather exposure as shown in Table 15-C, Wood Shakes.

WOOD SHINGLES are tapered pieces of approved durable wood, sawed both sides, of random widths ranging from 3 inches to 14 inches (75 mm to 356 mm) and in lengths of 16 inches (405 mm), 18 inches (455 mm) or 24 inches (610 mm).

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