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DeVonSwi t1_je8utgn wrote

MDF (particle board) should never be used for floors (or anything for that matter). Particle board will swell and break up with any moisture. I would suggest plywood (OSB as a second choice) and yes the 19/32 would be fine as a replacement.

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bad2behere t1_je92mov wrote

I'm not a professional, but I was taught by one and have helped do the work on every home we've repaired/redid for 52 years. @DeVonSwi is right. Plywood instead of particleboard is definitely the way to go on flooring. I've seen particleboard fall apart far, far more often than plywood. Shimming is also the way pros used to level things. Cardboard shims disintegrate faster than wood.

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