Minimum Roof Pitch For Asphalt Shingles On Flat Roof

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

Minimum roof pitch for asphalt shingles on flat roof.

Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. Experience the total owens corning roofing system and high quality roofing shingles. For those who don t understand the roof pitch number here is a way to envision it.

Owens corning produces high quality asphalt coating asphalt sealants and adhesives for asphalt shingles. What is the minimum pitch slope of an asphalt shingle roof. Considering the roof slope requirement is important. 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.

There are plenty of other options however for flat and nearly. Asphalt shingles can only be installed on roof slopes of 2 12 or greater. The minimum requirement is 2 12. We can even help you find a professional to install it.

So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12. The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.

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. Roof slope equivalents as rise. Asphalt shingles do require that you have a minimum pitch to your roof. Asphalt shingles continue to be the most widely installed roof covering option in north america.

If you re having asphalt shingles put on your roof you will have to have a minimum slope. Minimum roof pitch for shingles it is important for shingle roofs to function properly and one method of ensuring that this is achieved is to observe the pitch requirements for the shingles. Shingles of all types need to have a slope to function properly. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.

For example if it is a very low slope water including snowmelt or rainwater drains slowly and this increases the chances of. Degrees to pitch rise in run table. Why is 2 12 the minimum. That works out to about nine degrees if that works better for you.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12. Roof pitch multiplier table. Fortunately the requirements are quite accommodating.