Dark patches in limestone grout - TilersForums.com

[SOTON STEVE]

Hi Guys

I've just completed a job (grouted last wednesday, finished Thursday) where I used BAL Superflex Wide Joint Limestone. I have just been back to the house as the client has complained about random dark patches on the grout. It looks like damp spots, but I know its definitly not that. Please have a look at the pics provided. I know I havent done anything wrong with the mix. Please help me identify this problem.

Many thanks

Steve

 

[DHTiling]

Hi steve...

You need to call the rep out...don't let them say it's efflorescence...

 

[doug boardley]

hard to tell for sure what it could be steve, I'm assumig you used a white adhesive and it's not discolouration bleeding through

 

[SOTON STEVE]

The adhesive used was Bal Grip which turns pretty much white when dry. If it was a bleeding problem surley it would show up everywhere?

Steve

 

[Time's Ran Out]

:welcome:Steve - its the 2nd thread this week on Bal limestone grout and discolouration. That must tell you something!

Timeless John.

 

[Diamond Pool Finishers]

what was the substraight

 

[White Room]

Aqua mix grout colourant may be an idea if it's not sorted

 

[SOTON STEVE]

I've just read the other thread about this problem. Whats the best way to tackle BAL?

 

[DHTiling]

Before you do steve...

How long was the adhesive left to set and how deep did you go with it...?

 

[SOTON STEVE]

It was left to set for about a week before I got round to grouting.

 

[enduro]

You may have mixed it correctly, but was i cleaned off with to much water, to quickly? were the joints totally clean of adhesive before grouting?

 

[DHTiling]

It was left to set for about a week before I got round to grouting.

And how big a tile and how deep was the adhesive bed.?

 

[kaharrison9]

I replied on the other thread with this same problem i've experienced 3 times now with Bal superflex limestone.
I have followed the instructions exactly as said previously.
To add to my earlier comments i've used this grout on porcelain,ceramic and slate.
The drying time of adhesive has been 2 days,1 week and a regrout that was tiled one year later.
The substrate has been plaster and hardiebacker.
Quite a wide array but have had this problem every time.
Trying a differant brand next time.
Should have contacted Bal but assumed as nobody else had really mentioned it somehow i was at fault
Kev

 

[Perry]

bal grout used to always darken when the moisture comes out when the wrong adhesive ie bucket or to deep and or the substrate is non porous or gets wet ete

 

[basshunter]

bal grip?