Posted by Michael(KCMO) on March 18, 2006 at 18:42:23:
I’ve also used wood shims under the sub-floor at the transition between old & new. My method is to lay in the new flooring and then put a wood shim on top of it butted up against the old sub-floor. Since it’s a tapered shim, I find the point in the taper that provides a smooth transition and then cut off the part of the shim thicker than that. Do this at several points around the perimeter of the repair. Lift the new plywood out, put the shims underneath it on top of the floor joists or other braching I’ve added, lay the new plywood back down & secure the whole thing.
It will take a little bit of extra time, but it does make for a nice repair.
For what it’s worth,