Discoloured Limestone

[faceman]

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I have a problem with a limestone floor which shows discolouring after grouting. It was sealed twice with LTP Mattstone before I grouted it but I.m worried I've caused some irreversible damage. I've seen other pictures of framing caused by grout but this is different. It is mainly lengthways down the two sides. I've tried some intensive cleaners (alkaline based) and they did very little. As a last resort I tried bleach on one and this worked quite well. Unfortunately it's still not good enough and you can still see the shading, especially in the sunlight. I'm looking for advice from people who have positive things to say other than fitter error (my ego took a bashing on this one). I'm really hoping someone has experience in rectifying this problem as removing and replacing is simply not an option. Cheers

 

[peteablard]

How long ago was this fixed / sealed / grouted??

 

[Rookery]

And did you use fast set or slow set, grey or white?

 

[Turkish tiler]

how long between sealing and groting ?

 

[CJ]

Looks like moisture from grout/washing off. Had the same a few times myself. It can take a few days/week to dry out properly.

 

[faceman]

This was a job I did back in the summer last year and the discolouration happened when I grouted it. I original just thought it was just moisture and would dry out. It didn't and since then they got darker mainly from dirt. I had a chap who works for vitra seal come and look and he had some success. Unfortunately it came back. I can't remember the exact times between grouting and sealing but I did it the way I always do. Flexible rapid white adhesive, Bal limestone grout. The thing I find unusual is its mainly the sides and not the ends which we're grouted the same way. Anybody know intense cleaning products for light limestone?

 

[beanz]

I'd be tempted to get one of those specialist stone cleaning companies in, at least to have a look and give you an opinion.. Hopefully someone on here will be able to come up with something. Best of luck with it