So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.
Maximum roof pitch for shingles.
Following is a review of code requirements and nrca s roof slope guidelines as well as some additional factors designers should consider.
There are plenty of other options however for flat and nearly.
That works out to about nine degrees if that works better for you.
Degrees to pitch rise in run table.
If a roof slope exceeds this limitation the shingles should be applied by the following recommended method complying with astm d4586.
Asphalt shingles do require that you have a minimum pitch to your roof.
If you re having asphalt shingles put on your roof you will have to have a minimum slope.
And 4 12 minimum roof slope for slate and wood shakes.
Also if asphalt shingles are installed on a roof slope of 2 12 to 4 12 it shall be provided with a double underlayment application.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.
Fortunately the requirements are quite accommodating.
Secure the shingle to the roof deck with fasteners as recommended by the roofing manufacturer.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
The roofing materials most often used for these pitches include asphalt composite shingles.
The minimum requirement is 2 12.
Complete list of roofing types.
Traditional 3 tab shingles made with asphalt composite are the most popular type of shingle and are the most flexible in terms of adapting to many roof pitches.
Shingles of all types need to have a slope to function properly.
Roof pitch multiplier table.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
What is the minimum pitch slope of an asphalt shingle roof.
Roof slope equivalents as rise.
It is important for shingle roofs to function properly and one method of ensuring that this is achieved is to observe the pitch requirements for the shingles.
This means for every 12 horizontal units the roof must.
Clay and concrete roof tiles can only be installed on roof slopes of 2 1 2 12 or greater.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
Metal shingles and wood shingles.
Clay and concrete tile minimum roof slope roof pitch r905 3 2.
They won t be appropriate for all roofs.
Run in degrees and as percentage the minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.
The maximum slope considered suitable for normal shingle application is 45 degrees or 12 per foot.
These shingles are appropriate for pitches as low as 4 12 pitch all the way up to a 12 12.
