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Tool Talk Discussion Forum

o-t figuring common rafters.

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glennster

07-20-2007 07:41:23




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not sure if its old age, or being a parent made me stupid. building a 12 ft x 24 ft clubhouse (maybe secret mens club) for the kids. gable roof. trying to figure common rafter cuts. should be a 6 ft run, looking at a 4 ft rise to the top of the ridge board. i think thats an 8 inch rise per foot run. using a 2x6 ridge board. rafter length looks like it should be 7ft 2-1/2 inches, then deduct 3/4 inch for the ridge board, so rafter is 7 ft 1-3/4 inch ? i am planning to let the tail run wild and snap line and cut later. plumb cut and bottom cut should be 8 on the speed square for common? then the heel cut (birdsmouth) should line up the square on the plumb line and then measure 3-1/2 inches back (2x4 top plate) to get the heel cut. been a while since i did this, not sure anymore.

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glennster

07-23-2007 11:38:11




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 Re: o-t figuring common rafters. in reply to glennster, 07-20-2007 07:41:23  
thanks for all your help. got most all of the rafters up over the weekend. couldnt find my speed square book, so i was winging it. i shoulda went with a lower slope, man this roof is a lot steeper than i thought, but i need a little headroom up there to get the insulation in.



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NE IA Dave

07-21-2007 11:33:55




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 Re: o-t figuring common rafters. in reply to glennster, 07-20-2007 07:41:23  
Read your post again and decided I best explain that this measurment is without ridge board so you must subtract 1/2 the thickness of ridgeboard. You did not state a 1" or a 2" ridgeboard.



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NE IA Dave

07-21-2007 11:29:29




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 Re: o-t figuring common rafters. in reply to glennster, 07-20-2007 07:41:23  
6ft X 6ft =36

4ft x 4ft=16

36 plus the 16 =52

sq root of 52= 7.211025

7ft 2 inches and a half inch is not close-- it is exact

This is center of peak to outside of wall plate

most buildings are sized by the frame before siding is added.


The same formula will square the foundation 12 x 24

29ft 4 inches 11/16 is the number you need. again this is not close but exact

you did not state overhang, but often is overlooked. NE IA Dave

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Sam#3

07-21-2007 05:50:14




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 Re: o-t figuring common rafters. in reply to glennster, 07-20-2007 07:41:23  
Use the rafter table on your square. For 8 in 12 it's 14.42 inches ft./run.



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Handyman

07-20-2007 22:13:26




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 Re: o-t figuring common rafters. in reply to glennster, 07-20-2007 07:41:23  
are you sure you want to go that steep, that would be an 8/12 pitch roof or almost a 60 degree slopethird party image. I have built a couple of sheds with a 6/12 pitch and that is a 45 degree slope and that was difficult to put the tin on the roof without sliding off.

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paul

07-21-2007 08:36:14




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 Re: o-t figuring common rafters. in reply to Handyman, 07-20-2007 22:13:26  
That is a good thing in snow country.

--->Paul



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Sid

07-20-2007 20:24:23




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 Re: o-t figuring common rafters. in reply to glennster, 07-20-2007 07:41:23  
I checked my framers guide and you have the right measurement. And yes that is how you cut the birdsmouth. At least that is they way i do it. On the main rafters after I would cut a pattern. For me it was quicker and more accurate than measuring every rafter. I also cut my tails to length while on the cutting table. Again it was quicker and just as accurate as cutting them after they where put up. You run your peak to a string line, the tails are going to be straight.

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vern-mi

07-20-2007 10:12:58




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 Re: o-t figuring common rafters. in reply to glennster, 07-20-2007 07:41:23  
7.211 feet from top of ridge to birdsmouth edge.



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