The bottom line is that there is a plywood for almost every application. I need your advice on the plywood subfloor first: 1. I did not know different types of subfloor or wood type shoud be used. 23/32 Cat Ps1-09 Tongue and Groove Douglas Fir Subfloor, Application as 4 x 8. I'm putting down a laminate floor over a 3/4" plywood subfloor that is over a unconditioned crawlspace in North Florida. Yellow pine and Douglas fir are the types of wood treated with borate. I may have to replace it once due to water damage, but I will never have to replace it again. Treated plywood used for a subfloor is the worst possible choice (as you have now found out) unless of course it is also kiln dried. If I were in your situation, I would add 2" by 6"s or 2" by 8"s between the existing joists to frame the bathroom area so you can install new a subfloor---I'd use pressure treated 3/4" plywood. ... Pressure treated plywood is Not meant for interior sub-flooring. More info. Charlie: On the subfloor? Pressure-treated plywood: If you’re looking for a plywood that’s made to reject mold and mildew, pressure-treated plywood has been saturated with chemicals to keep it safe. Supposedly the new pressure treated plywood is much safer with no casual exposure risk (Of course they said the same thing about CCA years ago). Some bathroom sub-floor panel products are pressure treated as they may be exposed to moisture on a regular basis, and some builders use borate-treated lumber, such as ProWood Borate, for sill plates in areas where termite infestation is common. Step 4: Cut And Fasten Plywood Sheets To The Frame. Item #12182 Model #231331 The whole point of plywood in the first place is that is relatively stable. Pressure treated plywood, however, is … Temperature Control. The bottom layer is the subfloor. If you want your building project to stand up to the test of time, pressure treated wood should be considered a necessity ( In this way, It can survive outside for several decades without a protective finish ). To make it easier to pry out and remove, I don't cut more than 2' X 16" pieces of the damaged flooring, but go back with as full sheets of plywood as you can, and stagger the joints of the layers. A sheet of plywood that has been pressure treated has a preservative that makes it more resistant to rot, fungus, and termites. i used 3/4 plywood exterior grade. The keys to a well-planned bathroom: maximum efficiency and storage. For example, if you install resilient tiles or sheet flooring over a subfloor, any bumps, dips, or voids in the subfloor may be evident in the finished flooring. To be fair, there was one government study that did not find any more toxicity in the smoke from pressure-treated … The manufacturer of the flooring suggests a 6 mil plastic underlayment for the flooring to block moisture, but my concern is the potential for damage to the plywood by locking any moisture in. Pressure treated borate plywood can be used anywhere that moisture may be present. For mobile home parts ... with the wettness and you can't get accurate measurment . One of the nice things about plywood is the variety of options you can buy. Pressure-treated wood should not be burned except by professionals. This material could last for years without paint or any type of protective coating. 2. Pressure treated plywood is common plywood that has been subjected to pressure treatment with chemicals to prevent the wood from decaying, or rotting. Find the right Building Supplies on sale to help complete your home improvement project. Pressure treated plywood helps plywood stand up to the weather, decay and insects. That’ll eliminate all the squeaking and give you a good bond and give you a stronger floor. This helps it to carry much more weight before the panel will suffer any damage. I ALWAYS go back with pressure-treated plywood (3/4" subfloor and 5/8" flooring). What�s the thickness I should use, 15/32", 19/32" or 23/32"? I believe the original contractor who built the house did a sloppy job in there, 1st by installing OSB in the bathroom instead of using plywood and 2nd not putting any backer-board before installing the tiles and 3rd by the way the spread the thin-set under the tiles (the "curvy/old" way). Plywood to replace bathroom subfloor. 1 855 RONA-123. Repair help for the do-it-yourselfer. Visit us today for the widest range of Building Boards products. My foundation is on beam and will be insulated. ldduong. The Advantech subfloor will help isolate the floor which becomes overly cold in winter. 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