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OSB Board, also known as Sterling boards, are large boards of strong wood used in many different applications. The two types of OSB sheets available from us are strong, waterproof and versatile construction materials that can be used in DIY or trade projects.(plate) ROOFING CLASS A FIRE RETARDANT - Placer County, CA(steel) a) A 36 wide No. 72 ASTM cap sheet shall be installed under all metal valleys. b) Firestops between the roofing and roof deck shall be provided to prevent the intrusion of flames or embers, or cover the combustible roof. decking with No. 72 ASTM cap sheet. c) Screens or (plate) Some results are removed in response to a notice of local law requirement. For more information, please see here.