Maximum Roof Pitch For Asphalt Shingles

Low sloped roof shingle installation.

Maximum roof pitch for asphalt shingles.

In 12 0 25 in 12 1 19 built up roof coal tar pitch. The minimum slope for an asphalt shingle roof is 2 12. 18 43 asphalt shingles with special underlayment requirements 2 in 12. 9 46 built up roof asphalt.

Minimum required roof slope for roofing materials. Roofing material or system. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. For example if it is a very low slope water including snowmelt or.

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

Considering the roof slope requirement is important. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. 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.

Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above. We do install shingles on these in between pitches but special application measures must be taken in this middle ground. Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12. Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.