Minimum Roof Pitch For Architectural Shingles

Clay or cement tiles can be used on a wide range of roof pitches.

Minimum roof pitch for architectural shingles.

The minimum requirement is 2 12. 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. 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. Shingles of all types need to have a slope to function properly.

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. Slopes above 19 12 are not recommended since tiles on very steep roofs can rattle. 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.

A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction. 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. The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span. What is the minimum pitch slope of an asphalt shingle roof.

So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. What precautions need to be taken to install shingles on low slopes. Asphalt shingles continue to be the most widely installed roof covering option in north america. However you can only use this pitch with built up roofing or specialized synthetic roofing.

Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12. You could also opt for a pvc flat roofing membrane. Tuesday september 11 2018 manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12. 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.

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. What slope is considered low slope for shingles. 4 12 to 20 12 pitches.