Tile on new concrete slab - underlayment?

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  #1  
Old 04-17-03, 04:20 AM
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DIY James
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Tile on new concrete slab - underlayment?

What tips do you have for installing 12" ceramic tile on a new slab in a bathroom? Should I put down some type of underlayment to prevent the tile from cracking if the slab cracks? Also, do I need to wait a certain length of time to let the slab cure?
 
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Old 04-18-03, 09:08 AM
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Ceramic tile on concrete

Tile can be installed on concrete as soon as you can walk on it. Use a premium grade latex thinset mortar. Whether new or old concrete, the concrete should be free of contaminants like sealers or curing compounds that tend to interfere with adhesion. If cracking is a concern, there are fracture resistant membranes available that can be installed under tile.
 
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Old 04-19-03, 07:27 PM
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ee3
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If you are talking about a slab it typicly needs to cure 28days (moisture 3#per 100sf ) if you mean mortar bed then 24-70 hrs. is reccomended.
there are crack isolation membrane used to prevent tile from cracking. see www.noblecompany.com
 
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Old 04-20-03, 09:32 AM
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floorman
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if it is an older slab and no cracks are visible then by now you are ok for tile if there is a cold joint cut in the slab to reduce cracking of the slab then you need to membrane that crack to isolate it.Then there are the tiny spider type cracks that occure from stress on the slab you can use mesh tape on those and thin-set with theflat side of the trowel to isolate those.Hope this helps
 
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Old 04-21-03, 07:34 PM
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DIY James
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This is a new 4.5" concrete slab poured on top of the existing garage slab. Do I really need to wait the 28 days before installing tile flooring?
 
  #6  
Old 04-22-03, 06:55 PM
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ee3
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The real answer is, the slab in most cases needs to have a moisture reading of 3# per 1000sf. tested with a calceium cloride test. What you can do is duck tape a 2'x2' peice of poly to the floor(tape around edge)let it alone for 24hrs. then check for moisture or wet concrete under it. if its dry start tiling if wet wait..
 
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