So make sure you dont have any leaks in that bathroom, especially drains that only leak whe water is running through them. But any wood, if it gets wet and stays wet, will rot in time. I left some advantech scraps outside once for six months to see what would happen. Therefore, a sheet of plywood with a stated thickness of 3/8 inch is, in fact, 11/32 inches thick. The nominal (stated) thicknesses of plywood varies from 1/8 inch (3.2 mm) to 1 1/4 inches, which is comparable to 31.75 mm.
#ACTUAL THICKNESS OF 3 4 PLYWOOD FULL#
I would recommend 3/4 Advantech, and if you need the full 1.25 inches to make everything level, use 1/2 cdx under it. The tolerance for utility plywood is 1/32 inch, while it’s 1/64 inch for cabinetry plywood. Most likely your toilet wax ring is leaking under the finished floor. Your bathroom subfloor shouldnt qualify as a damp environment.
You should not use pressure treated plywood in your bathroom because: it is usually cdx grade, it doesn't lay truly flat, and the high moisture content makes it unstable. Old particle board might measure true 5/8. Rough plywood, CDX, might measure a true 5/8 because it isn't sanded smooth. Fractions can be more confusing than the decimal system.
Is your house built to that exactness-doubtful. Look at it-that 1/32 you are worried about is 1/2 of one of those. Your tape measure is marked in 1/16 increments. Pressure treated measures a bit more, because it swells when the wet treatment is forced into it. Planed and finished, like you are familiar with, it is 1.5x3.5 inches. It is sanded down to provide a smooth finish. That would also give you a little extra available thickness (1/4") to accomodate bedding the new tile with actual thinset mortar rather than just mastic as you (rightly) wish to do.
Now, personally, as you seem to indicate that the tile was installed directly over the plywood subfloor, and assuming the floor joist spacing is adequate-i.e., adequately narrow-I'd opt for a 3/4" PT ply (readily available at HD or Lowes, etc.) subfloor with 1/4" fiber cement (Hardie) board (screwed down-with screws appropriate for PT) over that, and then the tile. That said, I also found one other local-ish (to me) yard that also stocked it, so surely a few calls to some of your local lumber yards would yield a source for 5/8" PT ply. Unfortunately, I believe their northernmost location is in Ocala, FL. My local (small chain) lumber yard (plus other building supplies), Tibbetts Lumber, stocks 5/8" pressure treated plywood-I've purchased over 30 sheets of it from them the past few years (and, FWIW, it measures a true 5/8" thick)-which I would venture is exactly what you'd want to use.
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