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We're doing 12 by 12 natural stone (marble) on the tub surround and floor, and want a very narrow grout line. All the photos I've seen are this way, but our contractor insists everyone he's ever done it for hated it. Opinions, please?
All the marble floors I've ever seen or had installed had 1/8" or less grout lines. With natural stone floors, you want the beauty of the stone, not the blight of the grout. Grout is necessary to seal the joints, but you don't need big thick lines of it to accomplish that.
I say go with the narrowest grout line possible, if your stone setter can't do that, find one who will. As I mentioned, the tile companies that I've used over the years have had no problem with narrow lines.
here I have 1/4" and 1/8" grout lines in my floors, I would prefer a much smaller grout line too.