Patent ID: 7146771
Filing Date: 2006-12-12
Classification: E04D

Abstract:
1. A cap sheet for cold-applied adhesive roof installations, comprising: a reinforcement mat saturated with and encapsulated within a SBS rubber modified bitumen; the mat being a 170 to 180 g/m the SBS rubber modified bitumen forming a top layer above the mat and a bottom layer beneath the mat; the top SBS rubber modified bitumen layer having a top major surface and the bottom SBS rubber modified bitumen layer having a bottom major surface; the SBS rubber modified bitumen saturated and encapsulated reinforcement mat having a first longitudinally extending lateral edge and a second longitudinally extending lateral edge; the top major surface of the top SBS rubber modified bitumen layer having a first lateral edge portion extending inward from and along the first longitudinally extending lateral edge; a layer of inorganic surfacing material granules adhered to the top major surface of the top SBS rubber modified bitumen layer; the first lateral edge portion of the top major surface of the top SBS rubber modified bitumen layer being free of the inorganic surfacing material; the SBS rubber modified bitumen in the first lateral edge portion being a pressure-sensitive adhesive; the SBS rubber modified bitumen in the first lateral edge portion being overlaid by a first release liner; the bottom major surface of the bottom SBS rubber modified bitumen layer having a second lateral edge portion extending inward from and along the second longitudinally extending lateral edge; a layer of release material adhered to the bottom major surface of the bottom SBS rubber modified bitumen layer; the second lateral edge portion of the bottom major surface of the bottom SBS rubber modified bitumen layer being free of the release material; the SBS rubber modified bitumen in the second lateral edge portion being a pressure-sensitive adhesive; the SBS rubber modified bitumen in the second lateral edge portion being overlaid by a second release liner whereby, when installed, a removal of the release liners on overlapping edge portions of cap sheets permits the overlapping lateral edge portions of the cap sheets to be pressed and bonded together to immediately form an effective watertight, weather-secure seam; and the SBS rubber modified bitumen saturated and encapsulated mat being between about 36 and about 40 inches in width and first and second edge portions are each between about 2 inches and about 4 inches in width.