Maximum Roof Pitch For Asphalt Shingles

9 46 built up roof asphalt.

Maximum roof pitch for asphalt shingles.

Why is 2 12 the minimum. 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. Considering the roof slope requirement is important.

Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run. This number corresponds to the number of inches of rise in a 12 foot run. Asphalt shingles continue to be the most widely installed roof covering option in north america. Low sloped roof shingle installation.

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

Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12. Minimum required roof slope for roofing materials. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. 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.

Roofing material or system. We do install shingles on these in between pitches but special application measures must be taken in this middle ground. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. 18 43 asphalt shingles with special underlayment requirements 2 in 12.