Minimum Roof Pitch For Architectural Shingles

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.

Minimum roof pitch for architectural shingles.

For pitches of 2 5 12 up to 4 12 the roof requires double underlayment. 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. 4 12 to 20 12 pitches.

So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. Tuesday september 11 2018 manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 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. Clay or cement tiles can be used on a wide range of roof pitches.

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

What precautions need to be taken to install shingles on low slopes. However you can only use this pitch with built up roofing or specialized synthetic roofing. 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. 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.

You could also opt for a pvc flat roofing membrane. For low slopes as well as any other slope your local building department should be contacted. 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. What is the minimum pitch slope of an asphalt shingle roof. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. 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.