Minimum Roof Slope For Shingles

Asphalt shingles continue to be the most widely installed roof covering option in north america.

Minimum roof slope for shingles.

Why is 2 12 the minimum. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run. In 12 0 25 in 12 1 19 built up roof coal tar pitch. 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. Minimum required roof slope for roofing materials. 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.

In case a slope greater than this is necessary then a double underlayment application must be used as per the requirements of the international building code. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Installation on roof slopes below a 2 in 12 pitch is not recommended at all. Minimum pitch for corrugated metal roof.

Roofing material or system. The minimum requirement is 2 12. This number corresponds to the number of inches of rise in a 12 foot run. 18 43 asphalt shingles with special underlayment requirements 2 in 12.

That works out to about nine degrees if that works better for you. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. Now lets get into the minimum roof slope requirements based on the. A shingle roof like this north dallas garage in the photo above may have a failure no matter how good a job the installer did.

9 46 built up roof asphalt. 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 roof slope roof pitch r905 2 2 asphalt shingles can only be installed on roof slopes of.

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. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. Determine the minimum slope of the roof based on the roofing material. The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run.

Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12. What is the minimum slope for an asphalt shingle roof.