Published at Wednesday, 05 September 2018. Storage Shed. By Krystal Fry.
You want on your seat cut, and I use make a right angle and over here is the overhang, and that is also the plumb line. So when this rafter sitting up there, this will be straight up and down that cut will be straight up and down and all the way down there will be straight up and down up at the ridge. So that is the anatomy of my rafter to figure out exactly where you need to cut this. You need to do some calculations and then trial and error. I did more trial and error than calculations, but my calculations were close just a little bit off anyways.
You know straight up and down, and this cut over here is the seat cut, because it's the it's the seat of the bird's mouth. That's where this thing sits. So this this part right here is going to sit on top of your wall, and I did mine for two and a half inches. Just because that's like the leaves this much of the board, which is roughly following the two-thirds rule of cutting birds, mouths - and this is a right angle, because your wall is a right angle. So, since this is your plumb line, you just take a framing square or something that's square, something with measurements that can show you that this is going to be the desired length.
Here's the so there's a wake up for the ridge, and so that's at the angle that you want so yeah from from this angle. Right here is your angle of your roof that you're going to want 37 degrees, it's close to a 10 and 12 pitch, but not quite probably somewhere in between, and so that's for the ridge. And you go back down here and there is a cut for the bird's mouth and then this bird's mouth is so this line right here is the same angle as your Ridge cut over there or your plum cut. I've seen some people call it. So you get your your plumb cut here, which, when this rafter is up on the roof, it will be plumb.
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