Minimum Roof Pitch Shingled Roof

Shingles of all types need to have a slope to function properly.

Minimum roof pitch shingled roof.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. The minimum requirement is 2 12. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. That works out to about nine degrees if that works better for you.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Asphalt shingles continue to be the most widely installed roof covering option in north america.

The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. The metal roof minimum slope doesn t stray far from other building with different material. You could also opt for a pvc flat roofing membrane. What is the minimum pitch slope of an asphalt shingle roof.

However you can only use this pitch with built up roofing or specialized synthetic roofing. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. The standard of lower pitch actually ranges between 1 12 to 5 12. 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.

There are some standing seam metal roofing options available from atas and other manufacturers that can be installed on a roof with pitch of 1 12. Asphalt shingles can only be installed on roof slopes of 2 12 or greater. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.