Minimum Roof Slope For Shingles

Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.

Minimum roof slope for shingles.

That works out to about nine degrees if that works better for you. 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. Asphalt shingles continue to be the most widely installed roof covering option in north america. Considering the roof slope requirement is important.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Why is 2 12 the minimum. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Now lets get into the minimum roof slope requirements based on the.

So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. 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 roof slope for roofing materials. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12.

According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. This number corresponds to the number of inches of rise in a 12 foot run. What is the minimum slope for an asphalt shingle roof. Determine the minimum slope of the roof based on the roofing material.

Minimum roof slope roof pitch r905 2 2 asphalt shingles can only be installed on roof slopes of. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. 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.

Minimum roof slopes required by roofing material requirements for roof coverings section r905. Shingles of all types need to have a slope to function properly. Roofing material or system. 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 pitch for corrugated metal roof. 9 46 built up roof asphalt. Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Installation on roof slopes below a 2 in 12 pitch is not recommended at all.