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Cathy Hamm 10-06-2012 07:30 AM

floor tile - Question about subfloor?
I have taken up a damaged subfloor in a small bath. Do I need to replace subfloor, even if I'm using backer board too. Can the cement backer board act as subfloor?

JazMan 10-06-2012 07:04 PM

Absolutely not, concrete backer can not be the subfloor. Please tell us more in detail.


Cathy Hamm 10-06-2012 07:13 PM

Thanks for your reply and info. Why do I still need to install a sub-floor below the cement backer board that will have tile on top? Thanks!

joecaption 10-06-2012 07:20 PM

Tile board used on a floor is only 1/4 and offers 0 strength. It's just to bond the tile to.
Your going to have to let us know several things. What's on the floor now for a subfloor and underlaymant. (thickness and what it's made of)
What the width and spans of the joist are.
All very important when it comes to a tile floor.

JazMan 10-06-2012 09:18 PM


I was hoping you'd have supplied some info so we knew what you've got and how to proceed. For all we know what you're calling a subfloor may be your underlayment in which case it's possible to do what I think you wanna do.

If you were thinking of replacing the subfloor with concrete backer, you'd end up in the basement with the first step bruised and dazed.

Please answer Joe's q's and also include the joists type and size, spacing and unsupported span. And of course what is over the joists, how thick and how many layers etc.


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