The requirements for an asphalt shingles roof are contained in the international building code.
Minimum slope of roof for shingles.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.
The same can also be the case when the tiled roof has a reduced exposure.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.
Asphalt shingles can only be installed on roof slopes of 2 12 or greater.
According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.
There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12.
Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.
So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.
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Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.
Shingles of all types need to have a slope to function properly.
The minimum requirement is 2 12.
Learn more about slope roof.
We can even help you find a professional to install it.
That works out to about nine degrees if that works better for you.
If your home features a low slope roof you can still install the cedar roof of your dreams.
Asphalt shingles minimum roof slope roof pitch r905 2 2.
The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
This number corresponds to the number of inches of rise in a 12 foot run.
Minimum slope for asphalt shingles.
In high moisture climates low slope roofs will require additional maintenance to ensure excess water does not enter your home.
The minimum slope for an asphalt shingle roof is 2 12.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
