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Question:

why tile installed was defective?

newly installed ceramic tiles did not adhere to the tile adhesive

Answer:

Installing Tile can be a beautiful thing, but it can also be a terrible mess if not done correctly. A few things that could cause this is: Did you use mastic(glue) or thinset(concrete)? If you used Mastic that is not a good thing for an entire install on a floor, it should only be used as a repair or on small tile on a wall as it never truely dries gue to the outsite of the glue crusts and the center of the tile stays wet. If you used thinset was it mixed properly as that can be an issue due to coverage and set time. Did the back of the tile have dust on them from the box (the mill making these is dusty and sometimes tiles need to be cleaned before install) was the surface properly preped before you started? It needs to be a clean porus surface, if it is sealed or painted the tiles will not stick. Those are the most common issues, I hope this helps
were they walked on before they dried? .. or maybe the thinset wasnt put down thick enough to make a good bed or mixed incorrectly .. all i can think of .. sounds like a mess ..

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