What is the difference between sanded and non-sanded grout?
Sanded grout has sand added to it to increase the strength in a larger grout joint. It stops the grout from shrinkage and adds strength so that the grout will not crack. Non-sanded grout is used in many wall applications because of its non-abrasive texture. If the grout joint is going to be more than 1/8″, you need to use sanded. The only time a non-sanded grout is used on the floor is with the installation of polished marble.