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Discoloured tiles

Asked by Susan Allen from Derby: Our wetroom floor tiles have darkened in patches around the drain area and nowhere else. They are not wet as the underfloor heating has been on and we haven't used the room for approx 4 weeks.

TileProf says: Hi Susan, Did the Tiler use a White cement Based Floor adhesive as Grey Adhesive on Light coloured Stones Like Limestone and Marble will darken these sort of Stones, if so there is no cure for this apart from lifting them and replacing with new. Regards Russell at Tile Doctor

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