The pitch of a roof
 
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Old 01-04-2009, 06:37 PM   #1
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The pitch of a roof

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?
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Old 01-04-2009, 07:24 PM   #2
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Re: The pitch of a roof

http://roofgenius.com/roof-pitch-degrees.asp

It's the inch rise of the roof every horizontal 12" or one foot run. It's probably a US thing. For instance, I didn't know 50 mm is about 2". I had to go to a metric conversion chart. A 4:12 = 18.5 degrees.
Last edited by Mike Lamb; 01-04-2009 at 07:26 PM.
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Old 01-05-2009, 01:58 PM   #3
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Re: The pitch of a roof

4:12 means that for ever 12" horizontally I travel, I am moving 4" vertically. If you take a right-triangle and the base is 12", the side will be 4". the sidSame thing Mike said above, but I felt like typing it too
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Old 01-05-2009, 06:10 PM   #4
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Re: The pitch of a roof

Cheers Guys that explains it!
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Old 01-06-2009, 11:55 AM   #5
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Re: The pitch of a roof

It would still translate the same way in metric versus US standard, by the way.

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Old 03-14-2009, 03:39 AM   #6
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Re: The pitch of a roof

And you convert slope (4:12) to degrees using tan. So, tan(x) = 4 / 12 where x is the slope in degrees.
tan(x) = 0.3333
x = atan(0.3333)
x = 18.4 degrees
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Old 03-14-2009, 11:14 AM   #7
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Re: The pitch of a roof

Quote:
Originally Posted by GreenTree View Post
And you convert slope (4:12) to degrees using tan. So, tan(x) = 4 / 12 where x is the slope in degrees.
tan(x) = 0.3333
x = atan(0.3333)
x = 18.4 degrees
Thanks for that!
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