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I removed the carpet from the second floor and I noticed that I had termite issues. After replacing the bad plywood subfloor with a new one and I've noticed that it's slightly thicker than the old one. The new one is 3/4" and it's less than 1/4" thicker than the old one, do I need to level it? I'm planning to get hardwood floors nailed down. Also, would the old subfloor, 5/8", be enough for hardwood flooring?

Thank You!

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  • What's your joist interval?
    – isherwood
    Jan 9, 2019 at 16:23

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3/4" subfloor is more inline with modern practices, but you do need to level the step, if only to prevent an abrupt visual slope and potential noise. I'd feather out some leveling compound about 24".

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  • Thanks for your answer. Wouldn’t the self level compound break with the nail down flooring Instalation? Would a thin plywood over everything work?
    – Rodrigo Soares
    Jan 9, 2019 at 23:30
  • Self-leveling compound isn't appropriate, because you aren't leveling anything. Find a product that claims to do what you need.
    – isherwood
    Jan 10, 2019 at 13:37
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Yes, you should replace your 3/4 inch patch with 5/8 so it is level and a 5/8 inch thick subfloor is sufficient for the hardwoods.

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  • You're suggesting that he tear up the newly-installed subfloor with thinner plywood?
    – isherwood
    Jan 9, 2019 at 16:22
  • Well details were sketchy and I had pictured a small patch of 3/4 inch ply in one spot of the room. If that were the case, then yes, remove the patched spot and replace it with the same thickness as the rest of the floor.
    – Gary Bak
    Jan 10, 2019 at 0:36

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