Concrete as thinset

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Old 02-01-16, 02:50 PM
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Concrete as thinset

Old bathroom (1950s) with leak damage less than a square foot of mosaic tile in the corner behind the toilet. We have lived here about 6 months. The project is to repair the mosaic tile and we have a pretty good match. Question is can I just use concrete to level the slight variation (0-1/2 inch) for the minor repair and set the tile in that. No chance that this would ever be walked on based on the location. Thank you.
 
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Old 02-01-16, 02:58 PM
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I would opt for thinset, since concrete isn't the same formulation. Going against my grain, I would even use a premixed thinset in such a situation, for repairs, rather than spending $15 for a bag of thinset powder.
 
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Old 02-01-16, 04:22 PM
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I wouldn't use concrete. You would waste a lot of time sifting out the aggregate.
 
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Old 02-01-16, 07:49 PM
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mumble under breath making note - Larry recommended mastic 1/2/16....

Concrete is indeed a base material but not a setting material. This need to be done in two steps. First, skim the indent with thinset to smooth it out to base coat level. Then return and thinset the tiles in place. Trying to float the tiles in a thick bed of thinset will do nothing buy frustrate you. You can but small boxes of thinset (labeled glass mortar) it is a little stickier than regular thinset. Just make sure you mix from a powder not a ready mixed product.
 

Last edited by czizzi; 02-02-16 at 06:51 AM. Reason: typo
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Old 02-02-16, 04:14 AM
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Larry recommended mastic 1/2/16....
Ewww, hopefully, never, but I did recommend pre mixed thinset for a small repair in a not wet environment.
 
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Old 02-02-16, 08:05 AM
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Thank you for the responses, now for the fun part.
 
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Old 02-02-16, 08:38 AM
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You can buy thinset mortar in a 1 or 2 lb tub at HD.
 
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Old 02-02-16, 12:47 PM
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Premixed thinset is basically mastic. If it can stay soft in a tub, how is it going to cure when you bury it under tile and inch thick? Use Powdered thinset.
 
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