this has worked well for me, score the joint 1 side cutting blade width,3/4" deep, to score the concrete , then I fill the line the line half full of caulk,carve a small scerde out of a toung depresser, let set up. then mix Latacrete epoxy grout "almond" with 1/2 of the filler powder, diamond restoration to selected finish.

the flex caulk allows for expantion and keeps the epoxy from seeping low, and the epoxy grout finishes nicely , not saying this is the right way , but I know it works , even in harsh exterior conditions in the Fl Keys, where the beating sun causes a lot of slab movement, hope this helps  Scott Wilson

 

Hi,
I have a project just finishing up restoring a travertine floor.
Right above a set of steps there is a grout line that continues to
crack and we would like to replace it with a flexible material that
matches the travertine tiles.  Have tried putting a caulk seam in and
matching the color, but the caulk is weak and doesn't stand up to the
foot traffic.  Also having a hard time color matching.  Any thoughts?
Thanks.
Baird

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________________________________________
From the desk of
Baird Standish
Managing Partner
Facility Specialists, LLC
1616 Walnut St.
Philadelphia, PA 19103
Phone: 215-732-7505
Fax: 215-546-9160

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