Wonder board over existing tile to raise floor level?


Old 05-13-07, 02:57 PM
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Wonder board over existing tile to raise floor level?

I'm tiling a kitchen floor and an adjacent entry area - the entry has tile over concrete, very solid. The tile floor is just a little lower than the kitchen floor and a layer of wonder board is just right to bring the tile floor flush with the kitchen floor.

Will this work?

How do I best attach the wonderboard to the tile sub-floor?
Mortar or thin set, etc?
Should I also screw through the backer board into tile?

Is there something special I should do to prepare the tile? Scuff it up, etc?

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Old 05-13-07, 03:16 PM
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You would have to use tapcons if you planned on screwing the wonderboard down to the subfloor. The existing tile is not going to be thick or strong enough to hold screws.

You can you thinset with added acrylic instead of water to subfloor.

You would have to scuff up the old tile to make it adhere better, but my preference would be to rip up this floor anyways. One defect in the old tile could spread to your new floor.
Old 05-13-07, 03:36 PM
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Here is a thread you may want to read. It was a fairly lively discussion among the pros here as to this very question, but not over doing this over tile. It was over doing this on a concrete slab. I don't believe I'd try this over tile mainly due to the fact that you're relying on the tile under it for your final bond and stability, but that has to be your call in the final analysis. As to whether or not it will stick, my guess is that it will, but is it worth the risk that the tile under it will remain well adhered? http://forum.doityourself.com/showthread.php?t=283078
Old 05-14-07, 01:54 AM
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Thanks for the replies guys!

The floor has been rock solid for 40 years - no cracks or loose tiles in all that time.

I think we'll try it with the acrylic trick.

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