Roof Asphalt Shingles Requirements

Installation temperature requirements for asphalt shingle roofs ideally shingles should be installed at temperatures ranging from 40 f to 85 f.

Roof asphalt shingles requirements.

A 4 12 roof slope means the roof rises 4 feet for every 12 feet of horizontal roof span. Each flashing should overlap the one below by at least 75 mm 3 but not be visible below the shingle top lap. There are two simple rules to follow. The slope of the roof is measured by the vertical rise of the roof to the horizontal run and is expressed as a fraction.

Below 40 f shingles are brittle and crack easily when hammered or bent. If you re having asphalt shingles put on your roof you will have to have a minimum slope. Asphalt shingles can only be used on roof slopes of two units vertical in 12 units horizontal 2 12 or greater. Fortunately the requirements are quite accommodating.

Asphalt shingles do require that you have a minimum pitch to your roof. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. They won t be appropriate for all roofs. 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.