[header] How to regrout tile [title] Decide what type of grout you will be using. [step] This is dependent on the size of your grout's joint (the space between the tiles where the grout lies). There are two types of grout for regrouting tile: sanded and unsanded. 
If your grout joints are larger than 1/8 inch (. 3175 cm) use sanded grout to fill in the space; if your joints are going to be less than 1/8 inch (.