The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
Shingle roof slope.
Once you enter the basic roof dimensions and enter the type of roof you will get a very accurate result telling you exactly the amount of shingles that are required to cover your new roof.
The roof shingle calculator is a free estimator that serves a useful purpose during any roof repair or replacement project.
Considering the roof slope requirement is important.
Metal roof shingles can only be installed on roof slopes of 3 12 or greater 25 slope.
The minimum requirement is 2 12.
That works out to about nine degrees if that works better for you.
This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units.
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.
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.
For example if it is a very low slope water including snowmelt or rainwater drains slowly and this increases the chances of.
What is the minimum slope for an asphalt shingle roof.
Why is 2 12 the minimum.