I have long brown stains in the centre of my tiles, why? - TilersForums.com

[clarkey123]

I have recently had my house renovated, and had underfloor heating put in. In the kitchen, hallway, utility room and small study room, we have had white with grey marble effect tiles layed, with a high glass sheen and the make is colour-tile (glazed vitrafied tile) with a velvet finish. Over the past few months, brown stain marks have started to appear in the middle of the tiles and they are getting darker and more frequent as time progresses. I have been advised this could potentially be because the adhesive (the wrong colour or not allowed to go off). Would anyone know if this is correct or have any other suggestions? Many Thanks in advance.

 

[Anthony]

It’s not adhesive. You might have had a case if it were natural marble, but they’re not. I’ve had the unfortunate pleasure of working with that brand, utter garbage, would be highly surprised if it’s anything but the tile.

 

[Dave]

Is it wet heating system?