Minimum Roof Pitch For Architectural Shingles

4 12 to 20 12 pitches.

Minimum roof pitch for architectural shingles.

What is the minimum pitch slope of an asphalt shingle roof. Shingles of all types need to have a slope to function properly. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.

A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction. However you can only use this pitch with built up roofing or specialized synthetic roofing. Clay or cement tiles can be used on a wide range of roof pitches. 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 continue to be the most widely installed roof covering option in north america. 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. For pitches of 2 5 12 up to 4 12 the roof requires double underlayment. 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 minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. 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. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. 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 minimum requirement 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. What precautions need to be taken to install shingles on low slopes. What slope is considered low slope for shingles.

For low slopes as well as any other slope your local building department should be contacted. 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. Slopes above 19 12 are not recommended since tiles on very steep roofs can rattle. The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span.