One of the traditional distinctions you’ll see is between sanded and non-sanded grout. As the names imply, sanded grout has some grit to it, while unsanded grout does not. But making the correct choice is not just about the feel and texture: Sanded grout is the right move for wider grout joints, particularly floors, since it is more stable and resists cracking and shrinkage. Unsanded grout, which has a thinner consistency, is appropriate for joints that are an eighth of an inch or narrower. It’s ideal for soft, polished tiles such as marble and limestone (which can be scratched by sanded grouts) and for vertical surfaces like showers and backsplashes.