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Old 06-02-2005, 06:17 AM   #2
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Join Date: Jul 2002
Posts: 30,274
Grout line width is controlled by 3 things: 1) The "Look" and, more importantly, 2) how accurately calibered the tiles are, and 3) how flat the floor is. If the tiles are extremely well calibered, meaning that they are exactly the same size, then you can use a narrower joint. If the floor is not very flat, then you need a wider joint to help compensate. Expansion is not the issue at all.

3/16" joints are common for that size tile.
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