Maximum Roof Pitch For Shingles

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

Maximum roof pitch for shingles. Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above. This number corresponds to the number of inches of rise in a 12 foot run. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span.

Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work. Asphalt shingles continue to be the most widely installed roof covering option in north america. Clay and concrete roof tiles can only be installed on roof slopes of 2 1 2 12 or greater. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12.

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. Pitch is measured in inches of vertical rise of the roof over one foot 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.

Clay and concrete tile minimum roof slope roof pitch r905 3 2. This means for every 12 horizontal units the roof must.