Underlay for Ceramic Tile

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Old 07-23-08, 11:36 AM
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Question Underlay for Ceramic Tile

I've just gutted an old bathroom and have removed peel & stick tiles. I'm getting conflicting info. re what to use on top of the plywood sub floor before I lay ceramic tile. Should I use plywood or cement board?? It's a fairly small space - 5' x 7'. Also, I've removed old tub - should whatever I'm putting down be run straight through and underneath where the new tub is going?? I appreciate any help that you can provide.
 
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Old 07-23-08, 03:25 PM
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A deflection calculation needs to be done first, to determine if your current wooden subfloor is up to par. You can do a calculaton here. You will need to know your joists sizes, species, length, and unsupported span.

How thick is your current plywood subfloor? It should be at least 5/8" thick.

If your subfloor meets requirements, you then install a cement backer board, like Hardiebacker, over a bed of thinset, then you screw it down. After the board is installed, you can begin tiling on top of it.

Let us know what you have for a subfloor, in as much detail as you can provide.
 
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Old 07-23-08, 05:46 PM
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Thanks Mark - The floor joists are 16" on centre. 2 x 8 floor joist. The sub-floor is 5/8" plywood, tongue & groove. I've taken out a metal tub and am replacing with an acrylic (5' x 32"). Should the cement board go underneath the tub so that the ceramic tile can butt-up against the new tub or should plywood go underneath the new tub??
 
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Old 07-23-08, 05:55 PM
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You don't have to install the board under the tub.
 
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