Roof Pitch Required For Shingles

Flat and nearly flat roofs a pitch of 1 in 12 or 2 in 12 cannot be covered with shingles or shakes of any material since there is not enough angle to combat the danger of blow off.

Roof pitch required for shingles. Asphalt shingles require a minimum roof pitch of 2 12 or greater. Fifteen pound or heavier felt underlayment is required by code in some areas. Let us recap on the minimum roof pitch required for each type of roofing material. Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. A square of shingles will be the amount needed to cover an area of 100 square feet. Metal roof shingles require a minimum roof pitch of 3 12 or greater. 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.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Determine the minimum slope of the roof based on the roofing material. To calculate the size of the roof you need to measure the size of the roof as if it were flat account for roof pitch calculate square footage and finally determine how many squares of material are required for the roof the calculator above can handle all of this simply enter the length width and pitch and it will determine the size of the roof in squares. Roofing underlayment or felt is usually required for the ul fire rating to apply since shingles are usually tested with underlayment.

Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater. As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles. The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run. A square of shingles is the number of shingles needed to cover 100 sq feet of roof area.

However shingles are packaged in a way that they are light enough for the average person to carry around. We do install shingles on these in between pitches but special application measures must be taken in this middle ground. The minimum pitch for a. Low sloped roof shingle installation.

Asphalt shingles continue to be the most widely installed roof covering option in north america. What is the minimum slope for an asphalt shingle roof. How roof pitch determines suitable roofing systems. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.