What are the installation requirements for asphalt shingles?
Asphalt shingles shall comply with ASTM D3462 with underlayment complying with IRC Section R905.1.1. Asphalt shingles shall only be used on roof slopes of 2:12 or greater. For roof pitches 2:12 up to 4:12, double underlayment application is required. Asphalt shingles shall be fastened to solidly sheathed decks with fasteners of galvanized steel, stainless steel, aluminum or copper roofing nails, minimum 12 gauge shank with minimum 3/8” diameter head. Installation completed per manufacturer’s instructions.