Hey debbie, look on the back of a non-sanded bag of grout for the AREA OF USE: (rule of thumb) non-sanded grout is used where joint widths will not be inexcess of 1/8"; use sanded grout if your spacing tile over an 1/8". To keep you from getting out a measuring tape, basically all standard 4-1/4" wall tile have little 1/16" spaces molded to the sides of the tile. Use non-sanded, because of its very fine texture, is an exellent grout for highly glazed tiles to produce a smooth, dense joint. Sanded is too thick to fill such a small joint. Now I tiled my old wood coffee table with a 4-1/4" shower wall tile but I put a 1/4" spacer between each. I had to use sanded grout to keep the joints thick and dense. Dial me up at firstname.lastname@example.org if I can help in the future.