Bathroom subfloor 1/2" MDO plywood adhesive?

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jesterbratt

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Pulled up vinyl (1960s) floor in bathroom, house built 1900 . Old felt adhesive stuck on to hardwood floor boards. Boards are solid but slightly squeaky in some spots. I could probably get away with just putting down 1/4" durorock but a nice 1/2" a plywood subfloor will tighten everything up.

Went to lowes and asked the guy to cut a few 4x8 sheets of 1/2" plywood in half as the hallway in the house is very narrow. I told him what I was using it for, we talked about durorock, etc. Came time to pay and the cost was $50 for 1/2" plywood. Apparently he cut MDO plywood, which has some type of veneer on top of it that makes it great for painting.

https://www.menards.com/main/buildi...g-1-2-x-4-x-8-mdo-plywood/p-1444452504136.htm

https://www.lowes.com/pd/Medium-Den...r-Mdo-Plywood-Application-as-4-x-8/1000049011

Can I use this just like regular plywood or is there some special adhesive I need to use to get the durorock to stick to it?

They apologized and gave me 25% off the cost of the wood, the guy that cut it was on break and I didn't have time to wait to debate the issue.
 

Jadnashua

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FWIW, the thinset used under a cement board is not there to bond it to the substrate...it is there to fill any minor imperfections and provide 100% support...the nails or screws used hold it in place. I'm not sure if that plywood will work as intended. ON another point...hardwood underneath any tile is also problematic...there's a reason why plywood is used, it's much more stable than any dimensional wood, hardwood included. Also, have you verified that the floor is actually strong enough to support a tiled installation? Deflection consists of two parts...along the joists and in between them. Both parts must be strong enough, or you tiled installation is at risk.

A house that old was probably not built with tile in mind unless it was on a full-depth mudbed. Check out www.johnbridge.com for some help on this matter. They have a deflection calculator you can use to check out your deflection.
 
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