Maximum Roof Pitch For Asphalt Shingles

Minimum required roof slope for roofing materials.

Maximum roof pitch for asphalt shingles.

This number corresponds to the number of inches of rise in a 12 foot 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. 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.

So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. Roofing material or system. 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.

There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. In 12 0 25 in 12 1 19 built up roof coal tar pitch. 9 46 built up roof asphalt. Minimum required slope x in 12 minimum required slope degrees asphalt shingles.

Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run. 18 43 asphalt shingles with special underlayment requirements 2 in 12. The minimum slope for an asphalt shingle roof is 2 12.

Why is 2 12 the minimum. Low sloped roof shingle installation. Asphalt shingles continue to be the most widely installed roof covering option in north america. 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.