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My tiled shower needs to be repaired only where the walls meet the floor. While preparing for this by taking out the old grout, two small pieces of floor tile came out. Each piece that came loose is a corner piece (triangles - 2" x 2" by 2" - other tiles are 4" x 4"). Do I need to use thinset or can I use the same silicone I'll be using for the rest of the project?

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marked as duplicate by Niall C., ChrisF May 17 '13 at 21:27

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1 Answer 1

If you are going to regrout the pieces that came off, you should use thinset.

If you are going to grout with silicone, you could affix the loose tiles with silicone. I don't like silicone for use in wet areas, once moisture gets behind it, the area never dries out. With grout/thinset, moisture can escape. Sealing grout is like using a moisture blocking/vapor permeable housewrap over your sheathing.

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So, if I affix with silicone, it's possible to get water leaking to the subfloor, but the thinset first won't allow any water sepage? Looking at my options on-line, I haven't found any thinset in small enough quantities to be practical for these 2 small pieces? Am I looking in the wrong places for the thinset? –  Cecilia May 17 '13 at 19:55
    
You won't find less than 25 lbs. You could substitute a latex enhanced patch cement, comes in 5 lbs buckets. Be sure the base (under the tile) is dampened. After grouting, be sure to seal the grout (usually after 48 hrs. –  HerrBag May 18 '13 at 1:01

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