Shingle Roof Slope

For example if it is a very low slope water including snowmelt or rainwater drains slowly and this increases the chances of.

Shingle roof slope.

Considering the roof slope requirement is important. Metal roof shingles can only be installed on roof slopes of 3 12 or greater 25 slope. This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

Shingles of all types need to have a slope to function properly. 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 2 12 number is rise over run or two units of vertical for every 12 units horizontal. The roof shingle calculator is a free estimator that serves a useful purpose during any roof repair or replacement project.

Why is 2 12 the minimum. That works out to about nine degrees if that works better for you. Asphalt shingles continue to be the most widely installed roof covering option in north america. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.