Minimum Roof Pitch For Architectural Shingles

The minimum requirement is 2 12.

Minimum roof pitch for architectural shingles.

What precautions need to be taken to install shingles on low slopes. Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12. A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction. Asphalt shingles continue to be the most widely installed roof covering option in north america.

For low slopes as well as any other slope your local building department should be contacted. You could also opt for a pvc flat roofing membrane. Additional underlayment protection with special application methods are required when asphalt shingles are installed on a low slope roof following the manufacturer s application instructions. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.

The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. Slopes above 19 12 are not recommended since tiles on very steep roofs can rattle. What slope is considered low slope for shingles.

For pitches of 2 5 12 up to 4 12 the roof requires double underlayment. 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. Shingles of all types need to have a slope to function properly. However you can only use this pitch with built up roofing or specialized synthetic roofing.

What is the minimum slope for an asphalt shingle roof the short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. 4 12 to 20 12 pitches. 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. Tuesday september 11 2018 manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.

Asphalt shingles should never be applied to roof slopes below 2 12 2 of vertical rise for every 12 of horizontal run or 9 5. Asphalt shingles installed on a slope below the recommended roof pitch asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. 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.