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Hi guys, i have a question, you guys ,when you talk of pitch of a roof say the pitch was less than 4:12 etc, im not sure what that actually means we say in degrees as in a 33 degree roof, can some one explain please?
Cheers
Dave
 

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My math is apparently off by a little. A 12/12 is 12 units rise per 12 units run, .I figure that to be a 45 degree angle. By that logic i calculate a 4/12 (1/3 of 12/12) to be 15 degrees.

Where am I going wrong?
 

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Nevermind, its trig and I never took it in school. Guess I'm stuck wondering how it works. Makes me feel pretty stupid.
 

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The pitch of a roof is determined by the angle of descentfrom the most important thing about the pitch of a roof is its slant. The higher the angle is the more protected it will be. A pitch is measured by the run and rise. For example, a 4/12 pitch means the roof rises four inches for every twelve inches it runs




 
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