Minimum Roof Angle For Shingles

The minimum requirement is 2 12.

Minimum roof angle for shingles.

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. That works out to about nine degrees if that works better for you. The highest degree possible is a 45 degree roof which is a 12 12 pitch roof. A shingle roof like this north dallas garage in the photo above may have a failure no matter how good a job the installer did.

Determine the minimum slope of the roof based on the roofing material. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Metal roof shingles minimum roof slope roof pitch r905 4 2. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Any roof from 4 12 to 9 12 is considered an ordinary angle for a roof. Metal roof shingles can only be installed on roof slopes of 3 12 or greater 25 slope.

The standard for roof pitch is 4 12 though a 2 12 is completely fine for most structures. How roof pitch determines suitable roofing systems. Use a handy tool like snow load calculator to help you determine if your roof can handle the weight of snow based on its pitch. These are also the most common pitches for shed roofs.

The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run. The requirements for an asphalt shingles roof are contained in the international building code. Again the most important consideration is the weather. Shingles of all types need to have a slope to function properly.

What is the minimum slope for an asphalt shingle roof. Installation on roof slopes below a 2 in 12 pitch is not recommended at all. Mineral surfaced roll roofing minimum roof slope roof pitch r905 5 2. For simplicity sake every degree of pitch is roughly 4 75 degrees.

Asphalt shingles continue to be the most widely installed roof covering option in north america. 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.