Minimum Roof Slope For Shingles

So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.

Minimum roof slope for shingles.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. Minimum roof slopes required by roofing material requirements for roof coverings section r905.

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. Now lets get into the minimum roof slope requirements based on the. Minimum required roof slope for roofing materials. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.

9 46 built up roof asphalt. Determine the minimum slope of the roof based on the roofing material. 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. Why is 2 12 the minimum.

The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run. Minimum pitch for corrugated metal roof. Roofing material or system. Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 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. 18 43 asphalt shingles with special underlayment requirements 2 in 12. Considering the roof slope requirement is important. In 12 0 25 in 12 1 19 built up roof coal tar pitch.

Pitch is measured in inches of vertical rise of the roof over one foot 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. 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 minimum slope for an asphalt shingle 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. The minimum requirement is 2 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. Minimum roof slope roof pitch r905 2 2 asphalt shingles can only be installed on roof slopes of.