Roof Asphalt Shingles Requirements

If you re having asphalt shingles put on your roof you will have to have a minimum slope.

Roof asphalt shingles requirements.

Fasteners for asphalt shingles shall be galvanized stainless steel aluminum or copper roofing nails minimum 12 gage 0 105 inch 2 67 mm shank with a minimum 0 375 inch diameter 9 5 mm head of a length to penetrate through the roofing materials and a minimum of 0 75 inch 19 1 mm thick the nails shall penetrate through the sheathing. A 4 12 roof slope means the roof rises 4 feet for every 12 feet of horizontal roof span. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. There are two simple rules to follow.

Each flashing should overlap the one below by at least 75 mm 3 but not be visible below the shingle top lap. Imbed each step flashing in a 75 mm 3 wide application of asphaltic plastic cement and nail in place. Below 40 f shingles are brittle and crack easily when hammered or bent. Asphalt shingles continue to be the most widely installed roof covering option in north america.

Above 85 f it is easy to tear the shingles or mar the granular coating. Asphalt shingles can only be used on roof slopes of two units vertical in 12 units horizontal 2 12 or greater. They won t be appropriate for all roofs. Installation temperature requirements for asphalt shingle roofs ideally shingles should be installed at temperatures ranging from 40 f to 85 f.

The slope of the roof is measured by the vertical rise of the roof to the horizontal run and is expressed as a fraction.