Minimum Slope For Asphalt Shingles Roof

Asphalt shingles can only be installed on roof slopes of 2 12 or greater.

Minimum slope for asphalt shingles roof.

Roofing material or system. Asphalt felt paper that is tacked to the roof sheathing. What is the minimum pitch slope of an asphalt shingle roof. For those who don t understand the roof pitch number here is a way to envision it.

The requirements for an asphalt shingles roof are contained in the international building code. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

Minimum slope for asphalt shingles. Asphalt shingles continue to be the most widely installed roof covering option in north america. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the 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.

The minimum requirement is 2 12. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. That works out to about nine degrees if that works better for you.

18 43 asphalt shingles with special underlayment requirements 2 in 12. The minimum slope for an asphalt shingle roof is 2 12. Minimum required roof slope for roofing materials. 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 shingles minimum roof slope roof pitch r905 2 2. This number corresponds to the number of inches of rise in a 12 foot run. In 12 0 25 in 12 1 19 built up roof coal tar pitch. Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 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. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. For example if it is a very low slope water including snowmelt or.

Considering the roof slope requirement is important. Why is 2 12 the minimum.