Underlayment requirements


Old 05-21-04, 02:52 PM
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Underlayment requirements

I will be demo-ing a tiled bathroom floor. I am assuming the underlayment will be pulled up in the process. Do I need to intall a 1/4 plywood then the backerboard or can I intall backerboard directly to the PLYWOOD subfloor?


Last edited by jimaymn; 05-22-04 at 06:27 AM.
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Old 05-21-04, 05:29 PM
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I'm sure that a bunch of people are just about to ask you what your subfloor is made of.
Old 05-21-04, 06:35 PM
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That would be what comes to mind
Old 05-24-04, 07:12 PM
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Further info...

The subfloor is plywood. Do I need to put down 1/4 plywood underlayment or can I go strait to 1/2" backerboard and mastic?
Old 05-24-04, 07:38 PM
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1/4 plywood isn't much good for anything ...3/8 or more would be better. But if you have 2x10 floor joists, 16 inches on center, with 5/8 tounge and grove plywood, you can usually get away with just the cement board. Forget the Mastic though...it's not much good on floors at all. You'll need thin set for the cement board(yes, under it before you fasten it down) so you may as well use it on top too to set the tile.
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