Minimum Slope Of Roof For Shingles

Learn more about slope roof.

Minimum slope of roof for shingles.

Shingles of all types need to have a slope to function properly. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. The minimum requirement is 2 12. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.

This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. Owens corning produces high quality asphalt coating asphalt sealants and adhesives for asphalt shingles. Experience the total owens corning roofing system and high quality roofing shingles.

An installer will apply the cedar shingles of a fully waterproof built up roof or layer. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. The roof pitch between 2 12 and 4 12 is considered as a low pitch roof. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.

In high moisture climates low slope roofs will require additional maintenance to ensure excess water does not enter your home. Asphalt shingles minimum roof slope roof pitch r905 2 2. The minimum slope for an asphalt shingle roof is 2 12. Asphalt shingles can only be installed on roof slopes of 2 12 or greater.

What is the minimum pitch slope of an asphalt shingle roof. This number corresponds to the number of inches of rise in a 12 foot run. The requirements for an asphalt shingles roof are contained in the international building code. Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.

There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Minimum slope for asphalt shingles. If your home features a low slope roof you can still install the cedar roof of your dreams.

That works out to about nine degrees if that works better for you. Let owens corning help you determine when it is time for a new roof and then let us help you choose the shingles for your roof that are right for you. Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.