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I have floor tiles in my conservatory which also doubles as our kitchen. Over he past week or so we have noticed a discolouring of the grout. It looks like a white/yellow mould but is only present in the area of the conservatory that was extended beyond the original house footings.
I am wondering if this is a sign of damp that has got through the damp-proofing laid when the extension was built about 6 years ago?
I have not treated the grout with bleach etc and was seeking some advise before I call in a proffesional for help.
many thanks to anyone who can give me advise on this subject

Hi Andy and welcome to the forum.

You could do with a hand held damp meter really to test the grout as this would give you an indication as to how damp it actually is.

http://tinyurl.com/5s5ng3c



You can get them at most of the DIY retailers or hardware shops.

Hi Guys, could be efflorescence from either damp or a cleaning product

Are the tile &/or grout newly laid?

If not, is this the 1st time you have seen it in the 6 yrs?