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.

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. Considering the roof slope requirement is important. The minimum slope for an asphalt shingle roof is 2 12. 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. Shingles of all types need to have a slope to function properly. This number corresponds to the number of inches of rise in a 12 foot run. Asphalt shingles minimum roof slope roof pitch r905 2 2.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Minimum required roof slope for roofing materials. Why is 2 12 the minimum. Minimum required slope x in 12 minimum required slope degrees asphalt shingles.

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. Minimum slope for asphalt shingles. Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch.

9 46 built up roof asphalt. That works out to about nine degrees if that works better for you. All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb. For those who don t understand the roof pitch number here is a way to envision it.

In 12 0 25 in 12 1 19 built up roof coal tar pitch. Roofing material or system. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. For example if it is a very low slope water including snowmelt or.

Asphalt shingles can only be installed on roof slopes of 2 12 or greater. Asphalt felt paper that is tacked to the roof sheathing. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. 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.