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What is the thinnest grout line on a large porcelain floor tile you can get away with without running into problems?
Discuss grout line width question in the DIY Tiling Forum area at TilersForums.com.
I do 2mm regularly on floors with rectified porcelain and never had a problem but I'm just a sprout compared to some of these oldies2mm on a high quality rectified tile, but in my opinion anything 750x750 and above looks better with 3mm.
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