Pitched roofs including gabled and hipped roofs are the most common types in the united states.
How steep should a roof be.
A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible.
Examples of extreme slopes range from 1 4 12 almost flat to 12 12 sloping down at a perfect 45 degree angle.
For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep.
You can also divide the rise over run multiply by 100 and get a percentage.
In degrees 10 2 in 12 or 1 in 6 is considered a minimum.
The exact roof slope in degrees is given by the arctangent.
However in general terms low slope roofs commercial roofs are those below 2 12 or 3 12 while steep slope roofing would consists of roof pitches above either 2 12 or 3 12 and higher.
Roof slope is a very important aspect and it is considered the primary factor in roof design.
2 12 4 12 conventional slope roof.
9 12 20 12 steep slope.
So the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally.
A 4 12 pitch is around 18 5 degrees but not exactly.
Any pitch higher than 9 12 is considered a steep pitch.
Definitions vary on when a roof is considered pitched.
Thus a 4 12 pitch would be a 33 slope.