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MOS95B t1_j6niwwb wrote

(Unless the construction/formula has changed recently) You don't want particle board anywhere where you might even think water can get. Even if you manage to nail it down well enough that it doesn't eventually work loose, particle board does not handle water damage well at all. Particle board is glued together "scraps", that are them compressed. Nails don't work well in it, and it doesn't take much water for it to start to swell and crumble. And the thinner it is, the worse it is

Follow the manufacturer's recommendation, and spring for real plywood. It may cost you more now, but in the long run you'll spend a lot less

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No-Nobody-273 OP t1_j6nusai wrote

Thank you for responding.

EDIT - I pulled up the 1/2 in particle board subfloor and this was under it. Assuming I should pull up all particle board and re-lay down OSB or plywood. Would 1/2 inch plywood suffice to match height of adjacent hallway?

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MOS95B t1_j6nv4ho wrote

I personally wouldn't want particle board in any part of my flor, but...

As long as the uppermost layer of subfloor is plywood, it should be acceptable/good enough.

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