Minimum Slope For Asphalt Shingles Roof

9 46 built up roof asphalt.

Minimum slope for asphalt shingles roof.

This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. For example if it is a very low slope water including snowmelt or. 18 43 asphalt shingles with special underlayment requirements 2 in 12. The requirements for an asphalt shingles roof are contained in the international building code.

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

Asphalt shingles minimum roof slope roof pitch r905 2 2. Asphalt shingles can only be installed on roof slopes of 2 12 or greater. Shingles of all types need to have a slope to function properly. For those who don t understand the roof pitch number here is a way to envision it.

What is the minimum pitch slope of an asphalt shingle roof. That works out to about nine degrees if that works better for you. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. The minimum requirement is 2 12.

Minimum slope for asphalt shingles. Asphalt felt paper that is tacked to the roof sheathing. Considering the roof slope requirement is important. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.

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. Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12. Asphalt shingles continue to be the most widely installed roof covering option in north america.

Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work. Roofing material or system. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

Why is 2 12 the minimum. All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb.