Yes it is seagrass limestone, Im curious as to what caused the cloudy damage between the thinset dots, moisture collecting in the voids under the tiles? and then wicking up salts?

I've seen this before. I can't tell if this is limestone from this picture but it most likley is. We have a demolition service and thats where I encountered this problem before. In our case, and it looks to me like this is the same situation, the installer put 9 dots of thinset on the back of each tile instead of back buttering the entire thing. Also in our case, and most likely in this case as well, he (assuming gender...not politically correct...sorry...not really) didn't even bother to put thinset on the concrete (assuming it is a concrete slab). If he had there would have been a more uniform staining and maybe nobody would have noticed. 

It's likely poorly bonded to the concrete.  I'd rip it out before I tried to fix it but then again, not everybody has a demo service. Having said that, I agree with Baird. I would probably try a good enhancer but managing expectations would be my priority.

Jeff Hammons

Managing Partner

Cutting Edge Flooring Services LLC

dba Cutting Edge Surface Pros

dba Cutting Edge Concrete

dba Cutting Edge Tile Removal - Certified DustRam Contractor

4125 Hollister Suite P

Houston, TX 77080

Phone: 281-704-2819

Virus-free. www.avg.com

On Fri, Jun 2, 2017 at 8:44 PM, Baird Standish <bairdstandish@gmail.com> wrote:

Is that limestone?  Looks like glue or mastic coming through perhaps. I would twst a few tiles with a good color enhancer. May not remove the issue but may make it easier to live with.
B


________________________________________
From the desk of
Baird Standish
Managing Partner
Facility Specialists, LLC
15 West Highland Ave. Suite E
Philadelphia, PA 19118
Phone: 215-732-7505
Fax: 215-546-9160
www.facspecs.com

> On Jun 2, 2017, at 9:36 PM, Stephen Webb <stephen@newlifemarblerestoration.com> wrote:
>
> Greetings All, Can anyone explain what we are seeing and what caused it?  I don't think its practically restorable .
>
> thanks
>
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