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# 6/12 pitch, what degree is it?

## 6/12 pitch, what degree is it?

#1
02-22-06, 02:04 PM
Member
Join Date: Apr 2005
Posts: 127
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?

#2
02-22-06, 02:15 PM
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Join Date: Jul 2003
Location: N.E. Arkansas
Posts: 7,475
Received 1 Upvote on 1 Post
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

#3
02-22-06, 05:37 PM
Member
Join Date: Dec 1999
Location: South Dakota
Posts: 2,999
The Dragon is correct. Any good contractor has these in his back pocket.

#4
02-22-06, 06:12 PM
Member
Join Date: Nov 2003
Posts: 105
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).

#5
02-22-06, 06:35 PM
Member
Join Date: Apr 2005
Posts: 127
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?

#6
01-26-08, 03:47 PM
Member
Join Date: Jan 2008
Posts: 1
Originally Posted by JohnnyM76
.....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.