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jghg

Need help in confirming grade of plywood

jghg
9 years ago

We are remodeling our bathroom and everything's been demo-ed down to the 1x6 wood plank subfloor. Getting ready to install the tub, which recommends installation directly on top of subfloor. Our plumber is recommending we tear out the old subfloor and replace with new ply-wood because if the subfloor ever gets wet ( and most likely it will at the joint between the tub and the finish floor), there could be rot and failure of subfloor. This makes sense, but I wonder if there is an alternative to just tearing everything out. Can I put in a 1/4" or even a 3/8" layer of exterior grade plywood on top of the existing subfloor, install the tub over that and then place the underlayment for the finish floor next to the tub? My logic is that the thinner extra layer of subfloor will provide protection from any water above. Does anyone have any advise? Thanks!

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