Maximum Roof Pitch For Asphalt Shingles

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.

Maximum roof pitch for asphalt shingles.

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. Considering the roof slope requirement is important. You are required to have a double layer of asphalt saturated felt paper or a single layer of ice water shield under your. Minimum required slope x in 12 minimum required slope degrees asphalt shingles.

The minimum slope for an asphalt shingle roof is 2 12. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. Low sloped roof shingle installation. Minimum required roof slope for roofing materials.

Roofing material or system. 9 46 built up roof asphalt. 18 43 asphalt shingles with special underlayment requirements 2 in 12. 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. Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above. 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.

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. This number corresponds to the number of inches of rise in a 12 foot run. In 12 0 25 in 12 1 19 built up roof coal tar pitch.