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Old 02-23-2009, 01:30 PM   #1
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Add backer to slab floor?


I am installing ceramic tile in a basement bath. The current floor is just the concrete slab. Do I need to put 1/4" cement board or Hardibacker between the tile and slab? Or can I just set the tile directly on the concrete? There are all sorts of scarey article out there about floor sealers, moisture and steel trowels, so I figured I should ask.


Last edited by Bubbagump; 02-23-2009 at 02:05 PM.
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Old 02-23-2009, 02:14 PM   #2
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Add backer to slab floor?


Do not use backer board over cement. You can tile directly over clean cement. That means no paint, sealers or chemicals. If the cement contains any of those, grind down to fresh cement, then tile.
If you really want some kind of underlayment, look at Ditra.

http://www.schluter.com/6_1_ditra.aspx

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Old 02-23-2009, 02:17 PM   #3
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Add backer to slab floor?


You do not install cement backers to concrete.....ever. If the slab is in good shape, flat and no cracks, you can thinset the tiles direct. It is better to install a membrane like Ditra first, but not necessary if it's in good shape.

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Old 02-23-2009, 02:20 PM   #4
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Add backer to slab floor?


Excellent... less time and expense to apply it directly. This is a 10 year old slab in good condition, so thin set directly to it it is. Many thanks!
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Old 02-25-2009, 03:43 PM   #5
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Add backer to slab floor?


This answered my unasked question as well. Thanks
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