Divide the first part of the ratio by 12 to work out the pitch.
Roof pitch 12 2 addition.
Find the inverse tangent of the pitch to find the angle in degrees.
Get your roof size by using this roof pitch calculator.
How roof pitch determines suitable roofing systems.
Roof is 6 12 pitch and measures at 2 400 square feet so 2400 x 1 12 2 688 2 88 sqs added for pitch.
The best roofs for a 2 12 pitch roof pitch basics.
To convert between american roofing ratios and pitch degrees follow these steps.
Image 1 12 to 12 12 roof pitch 7 12 pitch.
What degree angle is a 12 12 pitch roof.
A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal.
If this isn t practical then perform the same measurement on the underside of the roof.
For that reason flat roofs are limited to these types of covering materials.
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.
The table below shows common roof pitches and the equivalent grade degrees and radians for each.
Roof pitch degree table.
A pitch of 2 12 is the minimum pitch for shingles made of asphalt so your roof just barely.