Lowest Pitch Shingle Roof

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.

Lowest pitch shingle roof.

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

In either case find a professional roofing contractor experienced with low slope roofs and these specific products. Metal roof shingles require a minimum roof pitch of 3 12 or greater. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. We do install shingles on these in between pitches but special application measures must be taken in this middle ground.

The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span. 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. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run. Slate and slate type shingles require a minimum roof pitch of 4 12 or greater.

So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. Installation on roof slopes below a 2 in 12 pitch is not recommended at all. 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. Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Wood shakes require a minimum roof pitch of 3 12 or greater. As well a slope of 4 12 is most commonly considered the lowest slope for standard shingle installations. Wood shingles require a minimum roof pitch of 3 12 or greater.