Hi
 
Hopefully its not to late I just saw the e-mail. I would use Nano- grout. They don't use sand in the aggregate.
 
http://www.buildingsystems.basf.com/p02/USWeb-Internet/buildingsystems/en_GB/content/microsites/buildingsystems/products/items/Nanogrout
 

Nanogrout

Nanogrout is a multi-purpose joint grout for all ceramic tile that can be installed in grout joints of 1/16" - 1/2" (1-12 mm). Nanogrout’s unique binding agent combination with nanotechnology provides excellent workability, superior ease of application and cleanability. This unique formulation offers temperature independent hardening properties and a surface which is easy to clean and is stain resistant.
 

 
On Mon, Jul 9, 2012 at 9:14 AM, Eric - DGG <eric@dirtygroutguys.com> wrote:
   Rescuing a bad tile job for a contractor. Marble tile with quarter inch sanded grout lines. He's willing to pull out the existing grout, but the question is, what should go back in? Unsanded won't hold up that wide.
 
   I forget the reason, not financial, but starting over is not an option.
 
 
Eric Lewis, Technical Mgr
DirtyGroutGuys.com
West Chester, PA 19380


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Wilfredo DeJesus
561-350-3076
Elite Flooring Inc.
Website / www.eliteflooringandrefinishing.com