This facing stone can be laid with or without grout depending on your preferences and the look you want to give your walls. Make sure the surface is clean, dry and flat. Apply the adhesive to the wall and the back of each stone. We recommend using all-purpose stone adhesive for better adhesion. Place the stones, alternating sizes, starting from the bottom, and press them down firmly. Next, apply the sealant (or not), let it dry slightly, then remove the excess with a trowel or a damp sponge for a neat finish. Finally, to protect your natural stone, we strongly advise you to apply a water repellent to your walls