How to mix and add grout to a brick wall. The wall has thin bricks placed up with mortar, each separated and held in place using spacers. Then when the mortar on the back of the bricks dried my wife Sara mixed and added grout in between the bricks. She finished all of the brick wall except for the top row and asked if I could help. I did but I used the mortar instead of grout and was a different color. Months went by and she asked me if I was ever going to fix the wall so in 2017 I decided to give it a shot. I used the same grout she used last time for the rest of the wall and think it turned out great.