From Rot To Tile In Japanese Bath

timberframer

hello, i am a timber framer by trade but have started into japanese style bath houses which brings me here it is an older home: on the joists sits 2x12 sub floor and on it sits 3/8" plywood then linoleum. Lino is up and out, there was a bit of rot into the plywood and 2x12. The 2x12 runs part under the wall and is 80 there so i feel i can keep it and add some kind of fill/patch to level it off, then patch in the 3/4" plywood. Questions: what do you generally use for patch material, one suggested 'Poly Underlay Plus Floor Leveler', it is cement based? With the 2x12 subfloor and 3/8" plywood, do i put my membrane/liner on this, then mud floor sloping to drain at about 1 degree, then thinset, then tile? OR does the floor need more underlay? it seems pretty stable at this point. kind thanks, michael hollihn, prana timber frames

Floorwizard

maybe too much deflection if your plywood is not at least a total of 1 1/8 thick.

Either that or install concrete board on top of the plywood subfloor.

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