Minimum Slope For Asphalt Shingles Roof

According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.

Minimum slope for asphalt shingles roof.

Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work. For those who don t understand the roof pitch number here is a way to envision it. The minimum requirement is 2 12. 18 43 asphalt shingles with special underlayment requirements 2 in 12.

Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. Why is 2 12 the minimum. Asphalt shingles minimum roof slope roof pitch r905 2 2. Asphalt felt paper that is tacked to the roof sheathing.

Asphalt shingles continue to be the most widely installed roof covering option in north america. 9 46 built up roof asphalt. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Minimum required slope x in 12 minimum required slope degrees asphalt shingles.

There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. The requirements for an asphalt shingles roof are contained in the international building code. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12.

Shingles of all types need to have a slope to function properly. But shingle roofing is not watertight in the sense that standing water or wind driven water on a low slope roof can work its way up between the laps which is the reason for the minimum 2 12 slope. All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb. This number corresponds to the number of inches of rise in a 12 foot run.

The roof pitch between 2 12 and 4 12 is considered as a low pitch roof so shingles can be installed in the roof slope between 2 12 and 4 12. What is the minimum pitch slope of an asphalt shingle roof. The minimum slope for an asphalt shingle roof is 2 12. Minimum required roof slope for roofing materials.

Minimum slope for asphalt shingles. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. In 12 0 25 in 12 1 19 built up roof coal tar pitch. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.

Considering the roof slope requirement is important. Asphalt shingles can only be installed on roof slopes of 2 12 or greater.