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Replacing pine subfloor and oak in Bathroom

12 years ago

We are remodeling our 1930-50's bathroom that had an addition in the 50's. We have discovered many rotten places in the flooring in both the origanal and addition, so we will be replacing the floor from the joists up. The subfloor is 3/4" 1x4 TG pine with 3/4" T&G oak. So we need to replace a full 1 1/2". What should we use, plywood? We do want to finish off with 1/2" hardi backer and vinyl tile. We want to do this right, any other suggestions for a good water resistant floor. I have read so many conflicting answers to which subflooring is right. Any help will be appreciated. This will be DIY. TIA for any help.

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