After removing the wall on the jacuzzi, I have a better idea of what
the floor is really composed of. It looks like there is a 12/16" or
13/16" plywood over the joists, then there is 8/16" or 9/16" plywood
over the first layer.
The second layer is more or less level with the carpeting in the
master bedroom. I would like to keep the master bathroom as close to
level as I can with the master bedroom level. If I put 1/4" or 1/2"
cement board on top of the 2nd layer of plywood, I think the change
will be sore to look at and will be a tripping hazard
Can the second layer or plywood be replaced with 1/2" cement board?
Some research on the internet makes me think that it will not be a
problem for ceramic tile surface cracks.
One thing to keep in mind is the larger tile you use, the stiffer your
floor needs to be. Whoever remodeled my bathroom did not keep this in
mind, and laid 6" tile on a floor that undoubtedly originally had the
1940's style little tiny mosaic tiles on it. There's several cracked
tiles in the area of the can, although I think the remodel was likely
done back in the 1980s.
replace "roosters" with "cox" to reply.
When I did this, I added 3/4" plywood under the subfloor spanning the space
between the joists to provide the needed stiffness. 2x4s glued to the joists and
the extra plywood, plus lots of screws hold it all together. Tile places seem to
usually recommend at least 1 1/4" of wood under the backer board.
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