In high moisture climates low slope roofs will require additional maintenance to ensure excess water does not enter your home.
Minimum slope of roof for shingles.
This number corresponds to the number of inches of rise in a 12 foot run.
According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.
This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.
Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.
Let owens corning help you determine when it is time for a new roof and then let us help you choose the shingles for your roof that are right for you.
There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12.
What is the minimum pitch slope of an asphalt shingle roof.
Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.
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An installer will apply the cedar shingles of a fully waterproof built up roof or layer.
Asphalt shingles minimum roof slope roof pitch r905 2 2.
Asphalt shingles can only be installed on roof slopes of 2 12 or greater.
Minimum slope for asphalt shingles.
The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
The minimum requirement is 2 12.
Learn more about slope roof.
The requirements for an asphalt shingles roof are contained in the international building code.
We can even help you find a professional to install it.
Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
The minimum slope for an asphalt shingle roof is 2 12.
That works out to about nine degrees if that works better for you.
The roof pitch between 2 12 and 4 12 is considered as a low pitch roof.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.
The same can also be the case when the tiled roof has a reduced exposure.
