Bathroom project coming up. Part of it is to replace a wood parquet
floor with ceramic tile. Parquet is 3/8" thick over 1/2 or 5/8"
particle board over 2x8 T&G subflooring (nominally 1-5/8" thick). I'm
concerned about achieving the same level on the new floor.
Can I remove the particle underlayment and screw concrete backer board
(Durock aka Hardi-backer, etc.) directly to the T&G subfloor? My
instinct says it is stiff enough without additional plywood
underlayment. If I have to put a plywood base on top of the T&G I have
no hope of getting the tile floor to the same level as the current
That raises a further question: I need a vapor barrier somewhere above
the T&G subfloor, I would have put it directly on top of the T&G then
put the Durock on top of that. Obviously, mastic is going to do no
good on top of the vapor barrier. Does the Durock, taped, provide a
OK, one last followup (I hope).
Can I use thinset as a leveler over the 2-by subfloor? There is some
uneven-ness between the boards, maybe 1/8" at most and I'd like to use
the 1/4" wonderboard if possible (the subfloor is very solid, btw).
If I sand down the subfloor a bit, will the adhesion be sufficient for
the thinset? Then I plane to use tile mastic on top of the thinset
skim coat, wonderboard (durock) nailed on top of that and taped with
fiberglass tape and thinset. Lastly, the floor tiles.
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