What's New Torch Grade Selvedge Edge Films Engineered Films	Glossary APP (Atactic Polypropylene): A modifier of asphalt (see modified bitumen roof membrane) that increases the UV resistance of the bitumen as well as its flexibility at low temperatures and improves its flow resistance at high temperatures. Architectural Shingles (See Laminated Shingles) Asphalt A bituminous waterproofing agent applied to roofing materials during manufacture. Base Sheet A saturated or coated felt installed as the first ply in some multi-ply modified bitumen roofing assemblies. Built-Up Roof (BUR) A flat or low-sloped roof consisting of multiple layers of asphalt and ply sheets. Bitumen (1) a class of amorphous, black or dark colored (solid, semi-solid or viscous) cementitious substances, natural or manufactured, composed principally of high molecular weight hydrocarbons and found in asphalts, tars, pitches and asphaltines; (2) a generic term used to denote any material composed principally of bitumen. Cap Sheet A granule-surfaced coated sheet used as the top ply of a modified bitumen roof membrane. Cast Film A cast film is made by deposition a layer of plastic onto a surface, then solidifying and removing the film from that surface. The plastic layer can be in a molten form, in a solution, or in dispersion. Coated Sheet or Felt (1) an asphalt felt that has been coated on both sides with harder, more viscous asphalt; (2) a glass fiber felt that has been simultaneously impregnated and coated with asphalt or coal tar on both sides. Cold-Applied Roofing A continuous roof membrane, consisting of plies of felts, mats or fabrics that are laminated on a roof with alternate layers of cold-applied roof adhesive and surfaced with a cold-applied coating. COPOLYMER Two or more different polymers chemically linked together. It differs from an alloy or blend, which is a mixture of two or more polymers. Deck The structural surface to which the roofing or waterproofing system (including insulation) is applied. Felt A flexible sheet manufactured by the interlocking of fibers through a combination of mechanical work, moisture, and heat. Felts are manufactured principally from vegetable fibers (organic felts), glass fibers (glass fiber felts), or polyester fibers (polyester felts); other fibers may be present in each type. Fiberglass Mat An asphalt roofing base material manufactured from glass fibers. Flashing Pieces of metal or roll roofing used to prevent seepage of water into a building around any intersection or projection in a roof, such as vent pipes, chimneys, adjoining walls, dormers and valleys. Granules Ceramic-coated colored crushed rock that is applied to the exposed surface of asphalt roofing products. Hip The inclined external angle formed by the intersection of two sloping roof planes. Runs from the ridge to the eaves. Incline The slope of a roof expressed either in percent or in the number of vertical units of rise per horizontal unit of run. Also referred to as slope. Interlocking Shingles Individual shingles that fasten together mechanically and provide greater wind resistance. Laminated Shingles These shingles have more than one layer of tabs to create extra thickness. They are often referred to as three-dimensional or architectural shingles because they create visual depth on a roof and impart a custom look. Membrane A roof covering or waterproofing layer whose primary function is the exclusion of water. Modified Bitumen Roof Membrane A continuous, semi-flexible roof membrane assembly consisting of plies of saturated felts, coated felts, fabrics or mats between which alternate layers of bitumen are applied, either surfaced or unsurfaced. Organic Felt An asphalt roofing base material manufactured from cellulose fibers. POLYPROPYLENE One of the most rapidly growing commodity plastics. PP is used to make auto parts, appliance parts, pipes, toys, medical tubing, margarine tubs, syrup bottles and trash bags. Polyurethane Polyurethane is a polymer the molecular structure of which may cross-link and become a thermosetting plastic, or stay linear and remain thermoplastic. Thermosetting polyurethane molecules cross-link into a single giant molecule. Polymer Chemical compound with high molecular weight consisting of a number of structural units linked together by covalent bonds. The simple molecules that may become structural units are themselves called monomers. A structural unit is a group having two or more bonding sites. In a linear polymer, the monomers are connected in a chain arrangement and thus need only have two bonding sites. When the monomers have three bonding sites, a nonlinear, or branched, polymer results. Naturally occurring polymers include cellulose, proteins, natural rubber, and silk; those synthesized in the laboratory have led to such commercially important products as plastics, synthetic fibers, and synthetic rubber. Re-roofing The practice of removing an existing roofing system and replacing it with a new roofing system. Roll Roofing Asphalt roofing products manufactured in roll form, either smooth- or mineral-surfaced. Saturated Felt An asphalt-impregnated felt used as an underlayment between the deck and the roofing material. SBS (Styrene-Butadiene-Styrene) A modifier of asphalt (see modified bitumen roof membrane) that enhances the bitumen’s ability to resist the effects of aging the weather. Smooth-Surfaced Roof A roof membrane surfaced with a layer of hot-mopped asphalt, cold-applied asphalt-clay emulsion, cold-applied asphalt cutbacks, elastomeric coating, or sometimes with an unmopped, inorganic felt. Square A unit of roof measure covering 100 square feet. Strip Shingles Manufactured in both standard and metric dimensions, these asphalt shingles are approximately three times as long as they are wide, and are distinguished by the number of cutouts or tabs that they have. The most common are three tab. Tensile strength The resistance of a material to being torn apart; the maximum tensile or pulling stress it can withstand. Tensile strength tests may measure the tensile stress a material can support without yielding, or without breaking. Three-Dimensional Shingles (See Laminated Shingles) Underlayment Asphalt saturated felt used beneath roofing to provide additional protection for the deck. ULTRAVIOLET (U.V.) STABILIZERS Commonly used in PVC, polyethylene, polypropylene, polystyrene, ABS and polyesters to prevent degradation from U.V. radiation.
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