Rafter Birdsmouth And Wall Sheathing ??? - Building & Construction - DIY Chatroom Home Improvement Forum


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Old 07-10-2009, 09:11 AM   #1
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rafter birdsmouth and wall sheathing ???


Do you cut a rafter birds-mouth so that it sits on top plate including the wall sheathing (4" for a 2x4 wall with 1/2" CDX) or make the cut to the top plate and butt the sheathing up to the bottom of the birds-mouth?
So sheath the wall first and then cut the rafters or cut the rafters first?
My house has the construction where the builders sheathed first and then cut the birds-mouth.

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Old 07-10-2009, 10:53 AM   #2
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rafter birdsmouth and wall sheathing ???


I usually sheath 1st, then do the rafters
Sheathing ties everything together so it won't move
On my cabana addition I did the bottom 3' with cement board then the rafters, then the rest of the sheathing
The old siding on the existing cabana rotted out at the bottom
So I used cement board on the bottom 3' to prevent rot

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Old 07-10-2009, 03:04 PM   #3
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rafter birdsmouth and wall sheathing ???


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Originally Posted by Clutchcargo View Post
Do you cut a rafter birds-mouth so that it sits on top plate including the wall sheathing (4" for a 2x4 wall with 1/2" CDX) or make the cut to the top plate and butt the sheathing up to the bottom of the birds-mouth?
So sheath the wall first and then cut the rafters or cut the rafters first?
My house has the construction where the builders sheathed first and then cut the birds-mouth.
Depends whether you sheath the walls first or after the walls are up. I sheath after the walls are up, so the birdsmouth is the width of the rafter.
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Old 07-10-2009, 04:06 PM   #4
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rafter birdsmouth and wall sheathing ???


So long as you tie the bottom top plate with the wall sheathing, for shear. If the rafter tails are left full thickness, as in a closed soffit, they may be in the way of that. Otherwise, you could add blocking across the top for shear-flow, a lot of extra work. Remember the nailing room required for the top of wall nailing if you sheath the roof overhangs first. Be safe, G
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Old 07-10-2009, 09:47 PM   #5
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rafter birdsmouth and wall sheathing ???


When I built my house I applied OSB sheeting to the frames before raising the wall.
So I had to allow for both the rim thickness plus the OSB thickness.
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