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wood subfloor in bathroom

I have a small 5 x 11 bathroom in 1961 coop/condo, wood subfloor (pictured) is not level. We don’t think water damage just building settling. This is a gut job, all fixtures being replaced. Would it make sense to use purlins then 3/4 plywood to level floor, then place new tub on new plywood? Or backer board & tile entire floor and put tub on top of tile?

Can’t put tub on joists or current subfloor as uneven. Can’t use self leveling compound as depth of pitch too deep (1/2 an inch or more).

Joe
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Assuming your plan is to level the entire floor area, I feel that using tapered shims with the 3/4" ply would be the best of the options presented. You will have to deal with the extra floor height. I just don't like extending tile under the tub.

Anyhoo, if you were to level backerboard you would need leveled plywood under it anyway, for support, no?

Jimmy Fix-it
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