The MIA design manual does not have a spec for grout..All they say is if you use sanded grout on marble to tape the marble. I know I cant believe it either!   However I believe  the TCA states that unsanded grout should be used on grout joints 1/8 inch or less and sanded grout for wider grout joints.

On Tue, Jul 27, 2010 at 9:53 PM, Mike Marsoun <nulifesc@bigpond.com> wrote:
Does anyone have the MIA or TCA specifications for grout, what is used (sanded or non sanded) and specified for joint size 3mm or less. Their websites require memberships to access the info. Thanks!
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