Grout discolouring

[derekg]

Hi guys

Anyone got any idea why bal charcoal grout in porcelain mosaic on walls is discolouring.ie:

some of the grout is almost black and other parts are quite grey in appearance

this is happenning on a job i am working on now so far i have only grouted some of the job.

my suspicion is it is because the area in which i am working is very damp.:dizzy2:

Any thoughts

 

[DHTiling]

Is this happening as it is drying after grouting..?

 

[Ajax123]

Efflorescence??

 

[Gazzer]

Is the area where the problem is, damp while you are grouting or after you have grouted ?

 

[Paul the tiler]

D,
This may be as a result of adhesive in the joints "killing" the grout, what make of grout is it????? Dont say mapie please.
Paul

 

[DHTiling]

read again paul..he does say which..:smilewinkgrin:

 

[White Room]

Bal Paul

 

[Paul the tiler]

OOPs, thats what you get when you are reading and fighting off 5 year old twins, any how back to topic.
D does this effect go when you wet the grey areas? if so I would let it dry out completely and take a fresh view, as I say if the adhesive is present in the joints close to the surface of the tile/mosaic it can cause this.
Paul the deslex dislex bad reader

 

[derekg]

Hi all
Yes the area is damp it is toilets in a restaraunt in a basement in london.There has been a problem with water leaking in although not in the actual area in which we are tiling the tiling is all on new stud walls.This weekend just gone the whole basement flooded they have sorted the leek now but the water was 6 inches deep on sunday.But the problem started before the flood.

Discolouring started the day after grouting and is getting more patchy by the day i still have about 30 mtrs to tile and grout and dont want loads of problems.

I had a similar problem with bal charcoal a couple of years ago where the grout actualy got like a blue film over it and bal said it was due to cold conditions drawing out the Efflorescence.But this is not a blue film it just looks like some of the grout is drying a lighter colour.but i suppose it could be the Efflorescence.anyone suggest a product to get it right without to much work because im on a tight budget for this job.ie:Efflorescence remover.

obviously i Cant change grout half way through.

 

[White Room]

Surprised they even tiled in such a short time with that amount of flooding