Maximum Roof Pitch For Asphalt Shingles

18 43 asphalt shingles with special underlayment requirements 2 in 12.

Maximum roof pitch for asphalt shingles.

Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Low sloped roof shingle installation. Why is 2 12 the minimum. Roofing material or system.

Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run. Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above. 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. Minimum required roof slope for roofing materials.

Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. Asphalt shingles continue to be the most widely installed roof covering option in north america. The minimum slope for an asphalt shingle roof is 2 12.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. In 12 0 25 in 12 1 19 built up roof coal tar pitch. For example if it is a very low slope water including snowmelt or.

This number corresponds to the number of inches of rise in a 12 foot run. Considering the roof slope requirement is important. 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. We do install shingles on these in between pitches but special application measures must be taken in this middle ground.