How to Grout a Pebble Stone Backsplash

Protect the underside of the upper cabinets with a layer of masking tape adjacent to the backsplash surface. Ensure the tape is stuck securely to the cabinet surface to keep the grout from staining the wood. If the countertop surface is not tile or you do not want the countertop tile joint stained, include a similar protective layer of tape on the countertop.

Mix grout in one of the containers. Add an appropriate amount of water based on the instructions on the side of the bag, as different grouts have different water requirements. Allow the grout sufficient time to slake (stand for several minutes) so the chemicals have a chance to mix. After 10 minutes, remix the grout.

Spread the grout across the surface of the backsplash with a grout float. Spread the grout in several directions so it is pushed fully into the spaces between the stones. Scrape excess grout off the face with the edge of the float and return it to the container. Allow any standing grout to sit for at least 20 minutes before you wash it off the surface.

Dampen a sponge in a bucket of water and use it to clean the surface of the pebbles while at the same time smoothing the joints between the pebbles. Do not apply too much pressure as this will pull the grout out of the joints. Instead apply just enough pressure to clean the surface and smooth the joints. Rinse out the sponge frequently as you work across the entire surface and change the water if necessary. Let the backsplash sit for roughly one hour.

Check for additional streaks. Wipe them off with clean water and a sponge and remove the masking tape from the countertop and the underside of the cabinets. Allow the grout at least 72 hours to dry before you allow water to come into contact with it.