Forum Title: Subfloor over Slab OSB/Plywood
Hi, I've ripped up the carpet in my basement and am preparing to lay engineered hardwood. I have 6 mil plastic vapor barrier to go down first. Then I have 19/32 OSB and 7/32 plywood. I had originally planned to just use the OSB and anchor it to the slab, but in order to not penetrate the vapor barrier I switched tactics to a 2 layer floating subfloor. In order to not return the OSB, I'm opting for a thin plywood underlayment sheet for the 2nd layer. Which sheet should I do on top? I was thinking OSB on bottom and ply on top, but dont have a very good reason. Any issues with the general approach? Appreciate any and all advice!
Category: Flooring Post By: RON VAUGHN (Boulder, CO), 02/12/2019

Any moisture problem? A vapor barrier can just trap moisture under it and grow mold. You can just glue the wood floor to the concrete with an adhesive that has a built-in vapor barrier.

- Terrence Brown (Hialeah, FL), 04/01/2019

Plywood holds fasteners better than OSB

- LORRAINE DAY (Azusa, CA), 05/24/2019

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