Sand down the surface of the wall using an electric sander with a medium-grain sanding belt. This creates an even surface on the wall.
Vacuum the wall with a shop vacuum to remove debris from the area.
Spread a 2-inch-thick layer of rough grout over the entire wall using a trowel. Apply the grout in an even layer.
Press faux brick facings halfway into the grout, spacing each brick facing one-half inch apart. Grout will squish up in between the bricks.
Scrape the trowel over the entire brick-covered wall to smooth the excess grout into areas that contain less grout.
Wipe off the grout from the front of each brick facing with a washcloth.
Allow the brick-face wall to air dry for 18 to 24 hours.