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Ridge board height and cutting the birds mouth for a shed
Posted on 7/9/25 at 10:03 am
Posted on 7/9/25 at 10:03 am
The shed is 12'x12' and I want a 6/12 roof on in it.
Should the top of my ridge board be 38 1/2" from the top of the top plate?
After making a 26.6° cut on the end of the rafter, how far down should I measure from the long point to cut the birds mouth? 80 1/2" and then take away 3/4" for the thickness of the ridge board? Correct?
Should the top of my ridge board be 38 1/2" from the top of the top plate?
After making a 26.6° cut on the end of the rafter, how far down should I measure from the long point to cut the birds mouth? 80 1/2" and then take away 3/4" for the thickness of the ridge board? Correct?
2
Posted on 7/9/25 at 1:40 pm to NatalbanyTigerFan
My calculator is telling me 36". Rise is (12'/2 )x(6/12) = 36"
my calc is spitting out 79 11/16" if you care about tight tolerances.
quote:
After making a 26.6° cut on the end of the rafter, how far down should I measure from the long point to cut the birds mouth? 80 1/2" and then take away 3/4" for the thickness of the ridge board? Correct?
my calc is spitting out 79 11/16" if you care about tight tolerances.
This post was edited on 7/9/25 at 1:41 pm
Posted on 7/9/25 at 2:07 pm to Loup
Thanks Loup!
Posted on 7/9/25 at 2:11 pm to NatalbanyTigerFan
quote:
Thanks Loup!
make sure you check my math
. It's been about 15 years since I was on a framing crew. This post was edited on 7/9/25 at 2:13 pm
Posted on 7/9/25 at 2:14 pm to Loup
quote:
make sure you check my math
I was at 79 3/4" so you just confirmed that I was close enough.
Posted on 7/9/25 at 2:18 pm to NatalbanyTigerFan
quote:
how far down should I measure from the long point to cut the birds mouth?
Let me see if I can explain this in words.
79.75" measurement is length on top of rafter. From long point of rafter down to birdmouth but put a mark on top of the rafter not at birdmouth. Plumb down from that mark for your birdmouth for your plumb cut of birdmouth.
If you had a framing square, you could just step it off 6 times using 6/12 pitch.
Posted on 7/9/25 at 2:22 pm to 2 Jugs
quote:thats how its done
If you had a framing square, you could just step it off 6 times using 6/12 pitch.
Posted on 7/9/25 at 3:35 pm to cgrand
quote:
thats how its done
Can't do that with a speed square.
Posted on 7/10/25 at 6:09 am to 2 Jugs
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