06:43PM | 08/02/07
Member Since: 08/01/07
1 lifetime posts
I have asbestos tile on cement. we want to put cermaic tile on it. The tile is loose in spots. Can we put backerboard over the current old tile. We know that most backerboard don't suggest placing on concrete, but has anyone done otherwise? Any help or advice is appreciated!!



07:22PM | 08/02/07
Member Since: 07/03/05
283 lifetime posts
No, you cannot put cement board down on a cement slab. They are not meant to be merely bandaids to cover up something. Cement boards need to be screwed or nailed in place over a bed of thinset that takes up the voids under the board, Trying to countersink a tapcon in a cement board will cut right through the board. You would need about 70 screws per board.


07:59AM | 08/06/07
Member Since: 10/28/05
312 lifetime posts
while you can not isntall a cement backer unit over a cenemnt floor, you may be able to use use a cleavage, uncoupling, load distribution, and vapor management membrane such as schluter ditra. It is a little more exensive than cbu's but when compared top the cost of asbestos abatement, its a no brainer.

here is some more information:


There are two ways to do any job.

The right way and the wrong way.

Do it right everytime.


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