6/12 pitch, what degree is it?


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Old 02-22-06, 02:04 PM
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6/12 pitch, what degree is it?

Is my logic wrong here? A 12/12 pitch would have to be a 45 degree angle right? If thats true logic tells me a 6/12 pitch would be 22 1/2 but its not. It seems to be closer to 26 or 27 degrees. Why am I coming up with different numbers?
 
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Old 02-22-06, 02:15 PM
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Heres the pitch schedule:
12/1 = 4 degrees
12/2 9.5
12/3 14
12/4 18.5
12/5 22.5
12/6 26.5
12/7 30.5
12/8 33.75
12/9 37
12/10 40
12/11 42.5
12/12 45
 
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Old 02-22-06, 05:37 PM
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The Dragon is correct. Any good contractor has these in his back pocket.
 
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Old 02-22-06, 06:12 PM
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Trig

If you remember your trig functions tan(A) = Y/X, where Y is the vertical rise (6 in your example) and X is the horizontal run (12 in your example). The calculated angle is 26.565 degrees. Or, in your Microsoft Excell spreadsheet use the atan(Y/X) function to solve the equation A = atan(Y/X).
 
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Old 02-22-06, 06:35 PM
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Thanks pgriz that formula was what I really wanted. Math was always a pain in my ass. Thanks dragon i'll take note of all the pitches, although hopefully this is my first and last roof. Thanks jack for pointing out what a bad carpentar I am. What would we do without you?
 
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Old 01-26-08, 03:47 PM
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Originally Posted by JohnnyM76 View Post
.....Math was always a pain in my ass....
So were it fer me too.

I wished ther were uh way fer me ta measur stuf without them pesky numbers!



....but seriously, how IS it that rational thought is illogical when it comes to carpentry?....and BTW: HOW MANY carpenters do you know personally who excelled in trig?

...my guess is that if they excelled in trig, they aren't carpenters today.

...which is why somebody devised the speed square.

...nevertheless, I STILL don't get it.

6 is 1/2 of 12, and 22.5 is 1/2 of 45, but it just don't werk.
 
 

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