Minimum Roof Slope For Shingles

Why is 2 12 the minimum.

Minimum roof slope for shingles.

Installation on roof slopes below a 2 in 12 pitch is not recommended at all. Roofing material or system. Minimum required roof slope for roofing materials. That works out to about nine degrees if that works better for you.

Minimum pitch for corrugated metal roof. Shingles of all types need to have a slope to function properly. Minimum roof slopes required by roofing material requirements for roof coverings section r905. 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.

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. In 12 0 25 in 12 1 19 built up roof coal tar pitch. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Now lets get into the minimum roof slope requirements based on the.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run. The minimum requirement is 2 12. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.

The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run. 9 46 built up roof asphalt. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Asphalt shingles continue to be the most widely installed roof covering option in north america.

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. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. 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.

18 43 asphalt shingles with special underlayment requirements 2 in 12. Considering the roof slope requirement is important. Minimum roof slope roof pitch r905 2 2 asphalt shingles can only be installed on roof slopes of. 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.

Determine the minimum slope of the roof based on the roofing material. Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.