Minimum Roof Pitch Shingled Roof

This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.

Minimum roof pitch shingled roof.

Asphalt shingles continue to be the most widely installed roof covering option in north america. 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 minimum requirement is 2 12. Asphalt shingles minimum roof slope roof pitch r905 2 2.

Shingles of all types need to have a slope to function properly. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. However you can only use this pitch with built up roofing or specialized synthetic roofing. 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.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. 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. What is the minimum pitch slope of an asphalt shingle roof. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

The metal roof minimum slope doesn t stray far from other building with different material. That works out to about nine degrees if that works better for you. Asphalt shingles can only be installed on roof slopes of 2 12 or greater. You could also opt for a pvc flat roofing membrane.

The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.