[Clutchcargo]

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]

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]

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]

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]

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.