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Old 09-25-2004, 11:36 AM   #1
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hardibacker:thin set required?

So I'm laying down 1/4 hardibacker over old 3/4 plywood subfloor- 12" travertine tiles to go on next- my question- do I need to use thinset between the plywood and the hardibacker or can i just screw/nailit down?

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Old 09-25-2004, 11:38 AM   #2
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I believe that you can just screw it into the joists, use plenty of screws, 6" apart
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Old 09-25-2004, 11:44 AM   #3
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WRONG WRONG WRONG!!!

THe thinset must be used under the CBU. It helps to fill the minor imprefections and supports the CBU over it's entire surface.

You probably should double-check your sub-floor, too. Stone needs a very strong sub-floor, and (normally) 3/4" of plywood is not enough.

How thick are your joists, how long is the longest unsupported length, and how far apart are they? At the top of the webpage, click on Deflecto. It will help you determine if your subfloor is acceptable for stone.
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Old 09-25-2004, 12:52 PM   #4
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What Jim said.
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Old 09-26-2004, 03:05 PM   #5
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thanks for all the advice! I used the thinset-I'm working on a bathroom and the longest span im working on is only 6 feet so i think im good!
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Old 09-26-2004, 03:30 PM   #6
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Nope, won't do. We don't care how wide is the space on top of the joists, we need to know the span of the joist between supports below it. It's important, as is the rest of the information Jim axed for. The further you go before you find out your subfloor isn't suitable for tile without improvement, the more you gotta tear out. Either now or later when the cracking starts.

And please register and give us a first name to use. There are a lot of "unregistered"s on here at any given time and you could get lost inna shuffle.
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