Roof Asphalt Shingles Requirements

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. 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. Above 85 f it is easy to tear the shingles or mar the granular coating.

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A 4 12 roof slope means the roof rises 4 feet for every 12 feet of horizontal roof span.

Roof asphalt shingles requirements.

Imbed each step flashing in a 75 mm 3 wide application of asphaltic plastic cement and nail in place. The slope of the roof is measured by the vertical rise of the roof to the horizontal run and is expressed as a fraction. Asphalt shingles continue to be the most widely installed roof covering option in north america. Asphalt shingles do require that you have a minimum pitch to your roof.

Fortunately the requirements are quite accommodating. If you re having asphalt shingles put on your roof you will have to have a minimum slope. 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.

Below 40 f shingles are brittle and crack easily when hammered or bent. Installation temperature requirements for asphalt shingle roofs ideally shingles should be installed at temperatures ranging from 40 f to 85 f. 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.

Each flashing should overlap the one below by at least 75 mm 3 but not be visible below the shingle top lap.

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