Min Asphalt Shingle Roof Slope

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

Min asphalt shingle roof slope.

Roofing material or system. Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work. The requirements for an asphalt shingles roof are contained in the international building code. What is the minimum pitch slope of an asphalt shingle roof.

18 43 asphalt shingles with special underlayment requirements 2 in 12. Considering the roof slope requirement is important. Minimum required roof slope for roofing materials. Minimum slope for asphalt shingles.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Asphalt shingles continue to be the most widely installed roof covering option in north america. 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.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. The minimum slope for an asphalt shingle roof is 2 12. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.

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. The minimum requirement is 2 12. Owens corning produces high quality asphalt coating asphalt sealants and adhesives 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. 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. Why is 2 12 the minimum. Experience the total owens corning roofing system and high quality roofing shingles.

This number corresponds to the number of inches of rise in a 12 foot run. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Asphalt shingles minimum roof slope roof pitch r905 2 2. That works out to about nine degrees if that works better for you.

Asphalt felt paper that is tacked to the roof sheathing. Shingles of all types need to have a slope to function properly. We can even help you find a professional to install it. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12.

In 12 0 25 in 12 1 19 built up roof coal tar pitch. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.