We do provide some guidelines to tile installations that you can download as a pdf file. The sanded grout provides more resistance to cracking for joints larger than 1/8" wide. Sanded grout won't fit into a grout joint less than 1/8" wide. Industry standards state that minimum grout joint width should be 1/16" wide, but that requires that you have very precisely sized tiles and that you use a non-sanded grout. I never recommend going with a grout joint less than 1/8" wide because it is hard to fully fill a grout joint if it is less than that. You could go with a smaller grout joint, but you will have to sort through your tiles and not use those that vary too much in size which will waste some of the tile so you may need to buy extra tile. Also the more narrow the joint the more it accentuates any tile lippage (one edge of an adjacent tile higher than the other). If the grout joint is too narrow then the variations might show up by not making the grout joint look completely straight. The width of the grout joint is based on being wide enough to completely fill it and to compensate for the dimensional variations of the tile. ANSWER ANSWER - Grout joints are meant to support the edge of the tile.
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