Minimum Slope For Asphalt Shingles Roof

Minimum slope for asphalt shingles.

Minimum slope for asphalt shingles roof.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. 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. 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. Minimum required roof slope for roofing materials. Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. 9 46 built up roof asphalt. Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12. Considering the roof slope requirement is important.

Why is 2 12 the minimum. In 12 0 25 in 12 1 19 built up roof coal tar pitch. The minimum slope for an asphalt shingle roof is 2 12. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.

That works out to about nine degrees if that works better for you. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Asphalt shingles minimum roof slope roof pitch r905 2 2. For example if it is a very low slope water including snowmelt or.

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. Asphalt felt paper that is tacked to the roof sheathing. What is the minimum pitch slope of an asphalt shingle roof.

18 43 asphalt shingles with special underlayment requirements 2 in 12. Asphalt shingles continue to be the most widely installed roof covering option in north america. Asphalt shingles can only be installed on roof slopes of 2 12 or greater. The requirements for an asphalt shingles roof are contained in the international building code.

This number corresponds to the number of inches of rise in a 12 foot run. Roofing material or system.