Min Roof Slope For Asphalt Shingles

What precautions need to be taken to install shingles on low slopes.

Min roof slope for asphalt shingles. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. For example if it is a very low slope water including snowmelt or. The minimum slope for an asphalt shingle roof is 2 12. 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.

Considering the roof slope requirement is important. Why is 2 12 the minimum. That works out to about nine degrees if that works better for you. The minimum requirement is 2 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. Asphalt shingles can only be installed on roof slopes of 2 12 or greater. Minimum slope for asphalt shingles. Shingles of all types need to have a slope to function properly.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. For low slopes as well as any other slope your local building department should be contacted. What slope is considered low slope for shingles. What is the minimum pitch slope of an asphalt shingle roof.

In 12 0 25 in 12 1 19 built up roof coal tar pitch. Asphalt felt paper that is tacked to the roof sheathing. All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb. The requirements for an asphalt shingles roof are contained in the international building code.

A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction. 9 46 built up roof asphalt. Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Asphalt shingles continue to be the most widely installed roof covering option in north america. 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. Roofing material or system.

Minimum required roof slope for roofing materials. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. For those who don t understand the roof pitch number here is a way to envision it.

There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. Asphalt shingles minimum roof slope roof pitch r905 2 2.