Minimum Roof Slope For Shingles

Minimum required roof slope for roofing materials.

Minimum roof slope for shingles. 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. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run. Installation on roof slopes below a 2 in 12 pitch is not recommended at all.

So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. 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 short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.

This number corresponds to the number of inches of rise in a 12 foot run. 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. Minimum roof slope roof pitch r905 2 2 asphalt shingles can only be installed on roof slopes of. Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.

18 43 asphalt shingles with special underlayment requirements 2 in 12. Asphalt shingles continue to be the most widely installed roof covering option in north america. That works out to about nine degrees if that works better for you. The minimum requirement is 2 12.

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. 9 46 built up roof asphalt. Minimum pitch for corrugated metal roof. 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 slope x in 12 minimum required slope degrees asphalt shingles. Considering the roof slope requirement is important. Roofing material or system. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12.

Shingles of all types need to have a slope to function properly. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. Why is 2 12 the minimum. Minimum roof slopes required by roofing material requirements for roof coverings section r905.

Determine the minimum slope of the roof based on the roofing material. In 12 0 25 in 12 1 19 built up roof coal tar pitch.