Minimum Slope For Asphalt Shingles Roof

All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb.

Minimum slope for asphalt shingles roof. Minimum slope for asphalt shingles. Asphalt shingles continue to be the most widely installed roof covering option in north america. Roofing material or system. The minimum requirement is 2 12.

In 12 0 25 in 12 1 19 built up roof coal tar pitch. Considering the roof slope requirement is important. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. That works out to about nine degrees if that works better for you.

Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12. Asphalt shingles minimum roof slope roof pitch r905 2 2.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. 18 43 asphalt shingles with special underlayment requirements 2 in 12. This number corresponds to the number of inches of rise in a 12 foot run. For those who don t understand the roof pitch number here is a way to envision it.

The minimum slope for an asphalt shingle roof is 2 12. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. 9 46 built up roof asphalt. Shingles of all types need to have a slope to function properly.

There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. For example if it is a very low slope water including snowmelt or. Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. 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 felt paper that is tacked to the roof sheathing. What is the minimum pitch slope of an asphalt shingle roof. Why is 2 12 the minimum. Asphalt shingles can only be installed on roof slopes of 2 12 or greater.

Minimum required roof slope for roofing materials. The requirements for an asphalt shingles roof are contained in the international building code.