Indian Stone / Jointing Compound Staining

Question

Good morning.

I hope that you are well.

I am looking for a bit of advice please.

We had some Indian Stone paving laid in mid-November 2023. We haven't actually used it, as such yet, as the landscaping work is still ongoing.

We have noticed discolouration of the jointing compound / potentially the flags themselves, around some of the flags.

As far as we are aware, the tradesmen working on the project have not used any cleaner on the flags. It has just had the occasional jet wash with water throughout the project.

Does anyone have any idea as to what the build up / discolouration is please and any advice about how I can go about removing it? The issue is only present around certain flags, not all of them.

The two videos here highlight the issue better than I can describe it :-

https://youtu.be/dmBaGrDwe0o

https://youtu.be/KhIEw1UHGvA

The stone used is brand new.

Any advice on the root cause or solution to this problem would be much appreciated.

Many thanks
Jimmy

Ricardo · Accepted Answer

Hi Jimmy, I can almost guarantee that it is the salts coming through. Just dont seal it until the salts have gone through completely. Process can take up to 2 years from my experience. May have something to do with using the slurry primer on cold temperatures. I would ask them about that maybe. Good luck.

Robert · Answer

Totally agree with the last answer so to be honest  the flags are so poures maybe a different  type of grout  could of been used  but unless you want to drag it all out and spend time and money   the best option would be wait it out

Wayne · Answer

Well likely be the salt coming up. Just don't seal it until the salt have dissolved completely.

Michael · Answer

It would be the salt from the stone. It will take time to bleed through

Samuel · Answer

You can sue black spot which will clean the slabs off perfectly and then seal the slabs which will leave a new drag look to them

Peter · Answer

The jointing compound could be discoloured as water might not be leaving the joints which could cause an ideal environment for mold/algae build up it would be more noticeable on light colours,  same with the stone, worse in shaded areas or north facing gardens a good spray and leave product should work.

Indian Stone / Jointing Compound Staining

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