Maximum Roof Pitch For Asphalt Shingles

Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.

Maximum roof pitch for asphalt shingles.

Why is 2 12 the minimum. 9 46 built up roof asphalt. The roof pitch between 2 12 and 4 12 is considered as a low pitch roof so shingles can be installed in the roof slope between 2 12 and 4 12. Asphalt shingles continue to be the most widely installed roof covering option in north america.

For example if it is a very low slope water including snowmelt or. Low sloped roof shingle installation. Considering the roof slope requirement is important. Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.

Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. The minimum slope for an asphalt shingle roof is 2 12.

Minimum required roof slope for roofing materials. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12. You are required to have a double layer of asphalt saturated felt paper or a single layer of ice water shield under your.

If 4 12 and above is normal and 2 12 is minimum what about properties with roofs in between the two such as a 3 12 pitched roof. In 12 0 25 in 12 1 19 built up roof coal tar pitch. 18 43 asphalt shingles with special underlayment requirements 2 in 12. We do install shingles on these in between pitches but special application measures must be taken in this middle ground.