Maximum Roof Pitch For Asphalt Shingles

For example if it is a very low slope water including snowmelt or.

Maximum roof pitch for asphalt shingles.

Asphalt shingles continue to be the most widely installed roof covering option in north america. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run. 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. Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above.

Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 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.

In 12 0 25 in 12 1 19 built up roof coal tar pitch. 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. We do install shingles on these in between pitches but special application measures must be taken in this middle ground. Minimum required slope x in 12 minimum required slope degrees asphalt shingles.

Why is 2 12 the minimum. So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. Low sloped roof shingle installation. This number corresponds to the number of inches of rise in a 12 foot run.

9 46 built up roof asphalt. You are required to have a double layer of asphalt saturated felt paper or a single layer of ice water shield under your. 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.