Should I use sanded or unsanded grout?

It depends. Sanded grout should be used for any joint larger than 1/8 in. For joints smaller than 1/16 in. an unsanded grout must be used. Sanded grouts are harder and resist cracking much better. Some polished stones and glass require the use of unsanded grouts but if unsanded is used the joint must still be < 1/8 in.

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