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Unread 02-22-2021, 09:20 AM   #4
ss3964spd
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Location: Fairfax, Va
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Welcome, Cliff,

My first guess is the wall probably isn't load bearing but hard to say from here without seeing the roof structure above. Finish removing the drywall up to the ceiling, if you find a correctly sized header up there you'll have to have a closer look in the attic.

Since it appears your joists are spaced 16" OC your 3/4" OSB should be fine for ceramic. If you wanted natural stone you'd need 1.25" of structural subfloor. If you plan to cover the OSB with Ditra it should protect the OSB just fine as long as the other details, like the shower curb, are appropriately addressed.
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