Apply Thin-set Mortar to Niche Back Wall

What happens here

Begin by applying thin-set mortar to the back wall of the shower niche using a notched trowel. Ensure that the mortar is spread evenly to create consistent ridges, which will allow for proper adhesion of the first tile. This step is crucial for establishing a flat and secure base for the tiling.

Goal: Prepare the niche's back wall with adhesive for tile installation.