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    • #39600

      My husband is installing ceramic tile on our kithchen floor and tiles keep popping up. he used thinset to bond it to plywood and that didn’t work. so he used mastic and that worked on some then the last try, the mastic didn’t stick to the tiles. so now we are missing tiles on the floor and scraping the old mastic up is very difficult. can anyone please help?

    • #201987

      It sounds like the substrate is not rigid enough for your flooring material. Ceramic tile needs a very rigid sub-floor to remain in place. My guess is that you probably have only 3/4″ sub-floor. If this is the total thickness under the tile, it is insufficient. Also, the floor joist spacing is significant for rigidity. What do you have, 24″ or 16″ O/C? I did a bathroom tile job a while back and I had to add additional joists between the existing ones because the house was on 24″ centers.

    • #202025

      You dont say where the thinset failed. If it is sticking to plywood and not the tiles, my guess would be that you applied the tiles dry. When using thinset for tile, the back of the tile needs to be damp so that the thinset does not dry out before adhering. If it dries quickly, the tile will come loose as you have seen. I assume in this response, the adhesion failure is at the tile, not the floor.

      Rather than use the mastic, I would clean the floor and return to using the thinset, but soak the tile before replacing. Let excess water drain off as you butter the floor with thinset, then place the tile and slightly twist while adding pressure to set the tile. It should stick.

      Finally, on your next project, consider using a cement backer board under the tile. It provides a more stable surface and is ideal for thinset and mastic adhesion.

    • #202252

      sounds like your subfloor is bad

      has movment in it

      rigid tiles wont stick to a floor that flexes when soneone walks on it, no matter what you do

      if this is indeed the case, your sub floor is not going to support the tiles

      you probally have to start over

      did you put and sub floor down to start this job?



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