proper floor prep for bathroom tile

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Old 05-16-16, 09:48 PM
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proper floor prep for bathroom tile

To get the floor height I need after tiling my bathroom I am planning on: 1/4" ply, 1/4 durock, and then tile. Thinset between the ply and durock. Is this ok? thanks.
 
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Old 05-17-16, 04:57 AM
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Why are you putting down 1/4" plywood? What is there for a subfloor now?
 
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Old 05-17-16, 05:20 AM
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I think 1.25" plywood thickness is what is recommended under tile which would mean 1/2" plywood over 3/4" subfloor. I doubt there would be any benefit using 1/4" - that is mostly for vinyl floors. The size/span of the floor joists can also come into play.
 
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Old 05-17-16, 05:34 AM
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Regardless of floor height, you should never use 1/4" plywood as part of the subfloor under tile, as it is too flimsy.

As Dane asked, what's the subfloor now? Additionally, what's the size, spacing and unsupported span of the floor joists? Finally, ceramic/porcelain or natural stone tile?
 
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Old 05-17-16, 05:47 AM
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The joists are 2x10's on 16 centers. Then there is 23/32 T&G on the joists. On top of that was originally 5/8 particle board with the tile on that. So originally the only thing between the T&G and the tile was the 5/8 particle board. I want to use durock/hardibacker but want to avoid putting thinset directly on the T&G, therefore I thought thw 1/4 ply would work. Yeah, it does seem pretty thin though. I was just trying to keep the same floor thickness to avoid adjusting door/base trim.
 
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Old 05-17-16, 06:01 AM
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You've removed the particle board, right?
 
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Old 05-17-16, 06:30 AM
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Yeah, the particle board has to go. If you have the 1 1/2" and need 1 3/4" you could use 1/2" durock or hardiebacker, but not the 1/4" plywood.
 
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Old 05-17-16, 06:42 AM
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Yeah, I took it all the way down to the T&G. So this build up should be good?: Joists, T&G, 1/2" ply, thinset, 1/4" durock, tile.
What would you recommend for fastening the 1/2" ply to the T&G?
 
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Old 05-17-16, 06:57 AM
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Screws into the T&G but missing the joists. Deck screws are a good choice, drywall screws are not.
 
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Old 05-17-16, 06:58 AM
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1 to 1 1/4" decking screws, but not into the joists. Keep this row of screws into the subflooring only. You had a concern about the 1/4", so is that still in play, or do you plan on living with it?
 
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Old 05-17-16, 07:00 AM
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I'm thinking 1/2 ply on the T&G and 1/4 durock on top of that
 
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Old 05-17-16, 03:28 PM
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1/2" ply and 1/4" cbu is good.
 
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