Wash wall lighting installation recommendations from NTCA Technical Trainer Mark Heinlein

Proper preparation of substrate to ensure flatness requirements and installation of tile with acceptable lippage are key components for a successful wash wall lighting installation.  Determination of grout joint size and layout and location of lighting prior to the installation are critical.  Creating a mockup with lighting placed as it will be in the final installation and having all responsible parties review the mockup, make adjustments, or sign acceptance is strongly advised before proceeding with such an installation.
NTCA Reference Manual Chapter 6, pages 113 – 120 provide an excellent discussion on Critical Lighting Effects on Tile Installations.  Page 114 lists a series of 12 recommended tips for the tile contractor to prevent issues resulting from lighting