Limestone tiles colour change

Jagweb · Sep 1, 2019

Hi, I have recently had Jerusalem Light Limestone tiles installed over a brand new wet underfloor heating system laid on the original floor (concrete over 10 years old). A decoupling mat was put down first. The appearance has significantly changed during the process of laying including severe cloudy patches. What could have caused this?

Spare Tool · Sep 1, 2019

Seems to be a reoccurring issue with limestone at the moment, not leaving them long enough to completely dry out seems to be the issue, notice yours are grouted so must have been sealed now trapping in the moisture I'd presume..

Jagweb · Sep 1, 2019

Andystiletiling said:
Seems to be a reoccurring issue with limestone at the moment, not leaving them long enough to completely dry out seems to be the issue, notice yours are grouted so must have been sealed now trapping in the moisture I'd presume..

Just wondered what happens during the laying process that makes the moisture darken the tiles?

Spare Tool · Sep 1, 2019

The 6 litres of water mixed in with every bag of adhesive has to go somewhere, and as you've got an uncoupling mat down only place is up and out through the stone..

Dumbo · Sep 1, 2019

Moisture . . . .

J Sid · Sep 1, 2019

Also most of these tiles are stored outside, even if the pallet has plastic around it it will sweat and the stone will take in a lot of moisture. That all need weeks of drying time after being layed before sealing and grout. Customers need to be patient, most out there sadly don't want to wait and then they end up with this.

Jagweb · Sep 2, 2019

JulianSidney said:
Also most of these tiles are stored outside, even if the pallet has plastic around it it will sweat and the stone will take in a lot of moisture. That all need weeks of drying time after being layed before sealing and grout. Customers need to be patient, most out there sadly don't want to wait and then they end up with this.

Thanks for all the comments. So... if they are now sealed/grouted/sealed, will they ever dry out or is the colouring permanent?
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Andystiletiling said:
The 6 litres of water mixed in with every bag of adhesive has to go somewhere, and as you've got an uncoupling mat down only place is up and out through the stone..

thanks for the comments. The adhesive that was used was Tilemaster Adhesives Ultimate Grey C2 F S2 20kg. This is supposed to be rapid set - would moisture from the mix still have caused this do you think?

J Sid · Sep 2, 2019

I would expect over the coming months the tiles to lighten,

Dougs Third Go · Sep 2, 2019

they will dry out eventually but my guess is it will take quite a long time as the only evaporation egress will be through the grout joints, unless they were sealed too

Tiler Durden · Sep 3, 2019

Why did you use Grey Adhesive? Should be white.

Unused Account 1 · Sep 3, 2019

If its limestone ,should of been white adhesive ,watch out for shadowing ,porous tiles ,

J Sid · Sep 3, 2019

Well spotted... . . .

Bill · Sep 3, 2019

Grey adhesive will not always discolour limestone........ before adhesive, limestone was fixed in sand and cement and that was hardly ever white!

Some limestones are more porous than others so you probably just need to wait.

Dumbo · Sep 3, 2019

If we're going to pick on adhesive , shouldn't of used s2 on dural

J Sid · Sep 3, 2019

Jerry, didn't someone post on here that dural recommend S2? Read it somewhere
But I agree wouldn't use a S2 on mat.

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