Min Roof Slope For 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.

Min roof slope for asphalt shingles.

In 12 0 25 in 12 1 19 built up roof coal tar pitch. This number corresponds to the number of inches of rise in a 12 foot run. Why is 2 12 the minimum. Minimum slope for asphalt shingles.

Shingles of all types need to have a slope to function properly. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.

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

For low slopes as well as any other slope your local building department should be contacted. Considering the roof slope requirement is important. Asphalt shingles can only be installed on roof slopes of 2 12 or greater. Asphalt shingles continue to be the most widely installed roof covering option in north america.

What slope is considered low slope for shingles. For those who don t understand the roof pitch number here is a way to envision it. 18 43 asphalt shingles with special underlayment requirements 2 in 12. Minimum required roof slope for roofing materials.

Minimum required slope x in 12 minimum required slope degrees asphalt shingles. What precautions need to be taken to install shingles on low slopes. 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 requirements for an asphalt shingles roof are contained in the international building code.

The minimum slope for an asphalt shingle roof is 2 12. The minimum requirement is 2 12. That works out to about nine degrees if that works better for you. 9 46 built up roof asphalt.

Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. For example if it is a very low slope water including snowmelt or. Roofing material or system. All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb.

A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction. Asphalt shingles minimum roof slope roof pitch r905 2 2.