Short version: if my sidewall sheathing varies in thickness by 5/32",
is that a problem for applying cedar shingles, or can I shingle right
over that difference? I'll be using shingles with an exposure of
4.25" and a butt thickness of 0.45".
Long version: my house currently has 7/8" plank sheathing and cedar
shingle siding. The shingles needs replacing, and since I'm in
earthquake country, I'm going to resheath most of the house with 1/2"
Struct 1 CDX plywood. I also plan to use a 1/4" thick rainscreen mesh
(Home Slicker) on top of the new sheathing.
Now there are places where I'd prefer to leave the old sheathing, like
around windows and doors so I can leave the trim in place. The new
buildup will be 15/32" + 1/4" = 23/32" thick, or 5/32" less than the
If that difference is too great, I could either use 5/8" CDX (20-40%
more expensive), or use horizontal furring strips (a hassle). Any
other ideas? It's too thin for 1/4" foam board.