| 摘要 |
<p>A roofing shingle (10, 56, 58, 60) includes organic, resinous material and an inorganic filler material, the shingle (10, 56, 58, 60) having a top surface (12), two side surfaces (14), an upper end (16), and a lower or butt end (18), defining a cavity (40) on the underside of the shingle (10, 56, 58, 60), with ribs (44, 46) positioned within the cavity (40). When applied to a roof, the shingle (10, 56, 58, 60) has the appearance of wooden shake shingle and provides a Class A fire barrier when tested according to ASTM test E108-93 for flame spread, burning brand, and intermittent flame.</p> |
