This specification covers prefabricated bituminous sheet materials reinforced with a combination of polyester fabric and glass fiber, with or without granules, modified by styrene butadiene styrene (SBS) thermoplastic elastomer, and are intended for use in the fabrication of multiple ply roofing and waterproofing membranes. This specification is intended as a material specification only. Hence, issues regarding the suitability of the specific roof constructions or application techniques are beyond this scope. Also not addressed here are in-place roof system design criteria such as fire resistance, field strength, impact/puncture resistance, material compatibility, uplift resistance, and others. Materials shall conform to specified values of the following dimensional and physical properties: total and bottom coating thickness; net mass per unit area; peak load before and after heat conditioning; elongation at peak load; ultimate elongation; tear strength; low temperature flexibility; dimensional stability; compound stability; and granule embedment.

1.1 This specification covers prefabricated modified bituminous sheet materials reinforced with a combination of polyester fabric and glass fiber, with or without granules, which use styrene butadiene styrene (SBS) thermoplastic elastomer as the primary modifier and are intended for use in the fabrication of multiple ply roofing and waterproofing membranes.

1.2 This specification is intended as a material specification only. Issues regarding the suitability of the specific roof constructions or application techniques are beyond this scope.

1.3 The specified tests and property limits used to characterize the sheet materials are intended to establish minimum properties. In-place roof system design criteria such as fire resistance, field strength, impact/puncture resistance, material compatibility, uplift resistance, and others, are factors beyond the scope of this material specification.

1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.