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Old 07-05-2003, 06:14 PM   #1
John Perlette
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Concrete slab questions

Hi John and everybody,

I have a concrete slab that I want to tile, 12x12's. I've picked up some good pointers here already, like how to handle the carpet tack strips and any "potholes" that may be left behind, as well as slab levelness, etc.

The slab was primed and painted with 1 coat of concrete paint a year or two ago - is this going to be a problem?

I have heard about underlayments - is this necessary, or can I tile right over the existing slab?

Finally, the thinset....I've heard Versabond is the stuff to use, rather than cheaper stuff at half the price. Correct?

Thanks for your help!
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Old 07-05-2003, 06:31 PM   #2
tileguytodd
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Hi John, Welcome aboard.
Paint on concrete.do you know what kind?Painted concrete scares me and I generally remove it.you can do a test with a piece of scrap tile and thinset if you have the time to let it cure completly and then remove it.
Or, you can remove it by chemical or mechanical means.I generally prefer mechanical .Chemicals have a way of sometimes causing more problems then they cure.
A Large floor buffer with a grit sanding pad and some silica sand(get it wet) will make short work of even very stubborn paint.You should be able to rent one from a rental center.

Versabond is a good thinset.John swears by it.There are others that are also very good.Laticrete and Mapei are 2 other companies with excellant products.
Look for laticrete 253 au gold or Mapei Ultraflex2 or Kerabond/Keralastic.<---watch out for this stuff its very very good but a bit spendy
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Old 07-05-2003, 06:35 PM   #3
tileguytodd
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Oops i missed one
Underlayments for Slab
Ditra is one.Its an uncoupling membrane that can be used.It will add aproximatly 1.50-1.60 per s/f to your installation
If your slab is real wavey with high and low spots, you may want to consider a self leveling cement poured 1/4" Nominal.It may be 3/4" Deep in some area's but 1/4" Over your high points. This will add aproximatly 2.00 s/f to your installation.
Hope this helps!!
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Old 07-05-2003, 06:50 PM   #4
Davy
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John, I'am with Todd about the paint, it needs to go. If you have only minor leveling to do check the slab with a 6 ft straight edge and fill in the low spots with thinset. Rub it down lightly the next day with a rub stone. The holes from the tack strip can be filled with thinset.
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Old 07-05-2003, 07:16 PM   #5
John Bridge
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Welcome aboard, John.

Nothing left for me to say. Unless you have a lot of cracking, I don't think you need the membrane.
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Old 07-05-2003, 08:37 PM   #6
John Perlette
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Thanks fellas. First order of business will be getting that paint and primer off the floors.

I appreciate your replies.
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