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Discussion Starter #1
Hey everyone, first time here so be gentle.

Did my bathroom about six months ago. Put 12x12 tiles on the floor. I am getting "dark" areas on/in the grout. It's not dirt or mold, it appears as though the grout is wet. I've noticed it for the last few days so it's not drying, assuming it's wet. Today I ran the hair dryer on it for about 30 minutes and that didn't appear to have an effect. I'm concerned that it is getting wet from below but there is not plausible explanation for how it's getting to this place and not making anything else appear the same.

Does anyone have any thoughts?
 

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Tileguy
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Sounds as if the toilet could be leaking water between the substrate and the tile. Sometimes once grout gets wet the color can change and not return to its original color due to dirt migration into the porous grout.:) Just a thought.
 

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Did you seal the grout?
Where are the stains showing up.
 
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Tileguy
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Well it is still anyone's guess as to what your issues are but if you are sure there is no leak finding its way under your tile then the next possibility is "moisture migration" through the slab. This (moisture migration) of course would be impossible if you had a wood structure but with concrete it is very possible.

I would first check the water meter to be sure there is no leak occurring in the supply system. Turn of anything that may call for water then monitor the meter for a time. This assumes you have a meter that can be monitored. Then there are the drainage systems, are they intact? This includes leaking toilet seals.

Next thing would be; What is your water tabel's elevation at present? How about the weather, any rains lately? Then there is the water drainage-management system of your home. Do you have proper gutters and downspouts and is the water from the roof moved quickly away from the homes foundation/slab when it rains? What about underground sprinklers, are they working properly and not experiencing leaks? There could be any number of possibilities.

You didn't bother to complete your profile so we have no idea what area of the country you live in, assuming you are living in the U.S.
 
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