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Unread 10-21-2012, 01:37 PM   #2
Kman
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Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
Posts: 11,847
Grout lines 1/8" or less should be unsanded, more than 1/8" should be sanded.

The mildew problem you have is not related at all to whether or not it's sanded or unsanded grout, though. That problem is related to moisture that is trapped behind the tile. The problem won't be solved by changing the type of grout, and cleaning it with bleach only makes it look better for a little while. The mildew will return, sooner or later, regardless of the grout you use.

To fix the problem, you need to find out why the moisture is trapped and alleviate that problem.
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