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Porcelain Tiles Unbonded
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[QUOTE="Asc, post: 804754"] I have underfloor heating and a concrete floor. I cleaned the floor then PVAd it. I followed instructions on the bag of adhesive (cement based, highly polymer, modified, thin bed tile adhesive) The underfloor heating was turned off in advance. It was tiled using the trowel which was advised on the instructions from the adhesive bag (6mm square notched trowel). After around 10 days we heard some cracks and bangs but did not realise what this was. We turned the underfloor heating on, at the lowest setting after two weeks and we continued to hear cracks and bangs - we discovered that this was the tiles letting go. We have had to lift the whole floor, the tiles have come up with no effort at all. There is no adhesive stuck to the tiles (38m2 of 600 x 600 porcelain tiles) but it is stuck well to the floor. We have spent days taking the adhesive up with a hammer drill. On inspecting the granite tiles in the bathroom today they have also done the same and we are also going to have to take all these up and remove the adhesive from the floor. Does anyone know what the problem could be? The tiles appear to be quite powdery on the back - could it be this? Or is it a problem with the adhesive? Or something else we've done? We have recently laid tiles ceramic tiles upstairs using different adhesive and have had no problems at all. (Although there is no UF heating there) Would it help to clean then PVA the backs of the tiles before trying to lay them again? Thanks for any help anyone can offer. [/QUOTE]
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