Lowest Pitch Shingle Roof

Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above.

Lowest pitch shingle roof.

Installation on roof slopes below a 2 in 12 pitch is not recommended at all. So a 4 12 pitch roof rises 4 inches for every 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. Slate and slate type shingles require a minimum roof pitch of 4 12 or greater.

You are required to have a double layer of asphalt saturated felt paper or a single layer of ice water shield under your. It is important for shingle roofs to function properly and one method of ensuring that this is achieved is to observe the pitch requirements for the shingles. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. The asphalt shingle manufactures recommend that you install asphalt shingles on a recommended minimum of 4 in 12 or greater however most manufactures will warrant their shingles down to a 2 in 12 pitch if the recommended installation method is used.

The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span. Most manufacturer and industry recommendations require or at the very least recommend special underlayment or other considerations on roofs between 2 12 and 4 12. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.

As well a slope of 4 12 is most commonly considered the lowest slope for standard shingle installations. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run. As in all construction work paying attention to the little details can make all the difference between a long lasting trouble free project and one that results in callbacks and early failure never a good option with a new england roof. Current as of august 2020 asphalt shingles are an effective roof covering material for sloped roofs that can be successfully used on slopes as low as 2 12.

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. Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater. Metal roof shingles require a minimum roof pitch of 3 12 or greater. Wood shingles require a minimum roof pitch of 3 12 or greater.