Hi I came down this morning to 2 tiles looking like this, looking underneath the boards there doesn’t look like anything is wet, tried cleaning but nothing is working Does anyone know what causes this and what it could be?
We moved in 4 month ago, We were told we have underfloor heating, that comes on with the heating , although we can’t feel it often
Leak in wet underfloor heating, the blue being central heating additive leaching up? What do you think @Wayners?
Don't jump the gun yet, just a suggestion. Just looking at the photo again it does look as though the stain pools out from a straight line following the lay of the tiles which may be indicative. Wait for experienced plumbers on here, there are a number. You don't know whether you have a blue additive in your heating system I suppose?
Believe it or not some cleaning products can cause blue staining, you hardly had a spillage and it was left on it overnight
Just to monitor it take a couple of close up pics to see if it is spreading over time. I was going to suggest drawing a line round the stains but don't want you to risk marking the tiles. Edit - just saw Astra's post!
Is it wet/damp to touch, compared to the tiles that aren’t stained. Zooming in it doesn’t look like the grout is wet/stained. What is the pressure on your boiler reading? What type tile are they?
Not damp or wet, pressure is 1 and not sure on the type as haven’t been here long and floor was already in