Rolled roofing material is often used on roofs that are low sloped.
Minimum slope for asphalt shingle roof.
This number corresponds to the number of inches of rise in a 12 foot run.
The asphalt shingle manufactures recommend that you install asphalt shingles on a recommended minimum of 4 in 12 or greater however most manufactures will warrant their shingles down to a 2 in 12 pitch if the recommended installation method is used.
Minimum required roof slope for roofing materials.
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In 12 0 25 in 12 1 19 built up roof coal tar pitch.
18 43 asphalt shingles with special underlayment requirements 2 in 12.
Roofing material or system.
The minimum slope for an asphalt shingle roof is 2 12.
What is the minimum pitch slope of an asphalt shingle roof.
Learn more about slope roof.
Installation on roof slopes below a 2 in 12 pitch is not recommended at all.
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.
Minimum 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.
Otherwise the safest minimum pitch for rolled roofing is 2 inches of decline per 12 inches of horizontal direction 2 12 pitch.
Owens corning produces high quality asphalt coating asphalt sealants and adhesives for asphalt shingles.
There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 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.
That works out to about nine degrees if that works better for you.
Shingles of all types need to have a slope to function properly.
What is the recommended installation requirements for the installation of a shingle below a 4 in 12 pitch.
The roof pitch between 2 12 and 4 12 is considered as a low pitch roof.
We can even help you find a professional to install it.
Let owens corning help you determine when it is time for a new roof and then let us help you choose the shingles for your roof that are right for you.
The minimum requirement is 2 12.
What is the minimum slope for an asphalt shingle roof the short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.
Asphalt shingles can only be installed on roof slopes of 2 12 or greater.
If your roof pitch declines up to 1 inch vertically for every 12 inches horizontally 1 12 pitch it is a good candidate for rolled roofing as long as you use the concealed nail method of fastening.
The requirements for an asphalt shingles roof are contained in the international building code.
