The angle of a 2 12 pitch roof is roughly 9 46 degrees rounded to 9 5 in most cases.
Minimum roof angle for shingles.
Mineral surfaced roll roofing minimum roof slope roof pitch r905 5 2.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
Any roof from 4 12 to 9 12 is considered an ordinary angle for a roof.
The requirements for an asphalt shingles roof are contained in the international building code.
What is the minimum slope for an asphalt shingle roof.
The standard for roof pitch is 4 12 though a 2 12 is completely fine for most structures.
Again the most important consideration is the weather.
Metal roof shingles can only be installed on roof slopes of 3 12 or greater 25 slope.
The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run.
How roof pitch determines suitable roofing systems.
Determine the minimum slope of the roof based on the roofing material.
For simplicity sake every degree of pitch is roughly 4 75 degrees.
According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt 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.
The highest degree possible is a 45 degree roof which is a 12 12 pitch roof.
That works out to about nine degrees if that works better for you.
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.
Installation on roof slopes below a 2 in 12 pitch is not recommended at all.
The minimum requirement is 2 12.
Metal roof shingles minimum roof slope roof pitch r905 4 2.
The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
Shingles of all types need to have a slope to function properly.
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.
These are also the most common pitches for shed roofs.
