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Old 03-23-2009, 11:16 AM   #1
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rafter calculator help - bmouth cutout


Hello,
I've found some online calculators that are useful in telling me the rafter length, but I'm wondering if there's a more comprehensive formula that will tell me the length, plumb cuts, and location of the bmouth cutout and how much of a stand to leave and stuff.

I'll soon be framing a simple gabled roof for a shed which spans 10' with a 1' overhand (or more). I want a 6/12 or 7/12 pitch.

Thanks!

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Old 03-23-2009, 02:32 PM   #2
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rafter calculator help - bmouth cutout


I've actually just put a 2x up at the center point
I put a nail in the 2x to hold the top of the rafter up
Then I hold up the rafter where I want it & draw the cuts I need
Works on smaller stuff, & I did the same on my garage addition

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Old 03-23-2009, 02:41 PM   #3
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rafter calculator help - bmouth cutout


thanks. so how much do you typically cut away (or leave) for the bird's mouth in a 2X6 rafter going over a double 2X4 top plate?

thanks. yeah, i'll probably just do it this way.

(it would be nice to know what length material to order for the rafters, though, so there isn't excessive waste (or not enough).

Last edited by wombosi; 03-23-2009 at 02:43 PM.
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Old 03-23-2009, 02:52 PM   #4
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rafter calculator help - bmouth cutout


Basically I lower the rafter until I have the rafter sitting so that the birdsmouth cut will leave wood fully sitting on the top plate

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