My house was built in 1939, and therefore has 3/4″ t&g boards used for sheathing.
Recently, I had to replace some of the old sheathing boards because of rot. I replaced them with what I “thought” was 3/4″ thick CDX plywood and quickly realized the thicknesses didn’t match (the plywood was not as thick). To fix the problem, I used some shims between the framing and new sheathing to bring the plywood flush with the old t&g boards.
So my question is — did I do anything wrong here?
Replies
Yeah, what a pain that is with ply. 3/4 used to mean 3/4. Shims is one way. Unless you are trying to build a sheer panel or something, it should provide at least as much bracing as the old sheathing planks.
If the original was 3/4" boards, why not replace with 3/4" boards?
Was the damage extensive enough to warrant full sheets of plywood?
Nope. Just the area near the bottom of the front door where I replaced a length of rotted sill. I'd say 8-ft long by 2-ft high. I patched the areas with plywood because of the "exterior" rating.- Toolfreak
Rotted sill. Was the water getting in anywhere else?
Your fix sounds solid.
2 sheets of 30# felt might get you 3/32nds "
Nope. Front steps poorly installed -- pitched water toward house. Was quite a mess but all fixed now.- Toolfreak