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-   -   rafter birdsmouth and wall sheathing ??? (http://www.diychatroom.com/f19/rafter-birdsmouth-wall-sheathing-48536/)

Clutchcargo 07-10-2009 08:11 AM

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.

Scuba_Dave 07-10-2009 09:53 AM

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

Joe Carola 07-10-2009 02:04 PM

Quote:

Originally Posted by Clutchcargo (Post 299899)
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.

Gary in WA 07-10-2009 03:06 PM

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

Wildie 07-10-2009 08:47 PM

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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