If this is a new installation and you have not grouted yet, one choice is tile grout, sanded or unsanded.
If you are removing old and replacing, same would apply but also be sure to remove all of the old grout, clean out the joint well and then regrout.
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For extra protection, (against mold and mildew) seal the grout.
If the space is less than 1/8 inch, you should use unsanded grout. Spaces larger than 1/8 inch need sanded grout. The sand in the composition of this type of grout helps to keep these larger areas from cracking.
A rule of thumb is sanded grout for floor tiles and unsanded grout for wall tiles. But, I recently ran into a tile guy that I haven't seen in a while at the Home Depot and we had this conversation--he says he mixes both sanded and unsanded together in a mixture for all tiles. Take it for what it's worth, he does it everyday. Seal the tile job after grout has dried for extra protection.
If this is a new installation and you have not grouted yet, one choice is tile grout, sanded or unsanded.
If you are removing old and replacing, same would apply but also be sure to remove all of the old grout, clean out the joint well and then regrout. ...»
For extra protection, (against mold and mildew) seal the grout.