In particular, the NTCA has provided new or replacement documents for insertion in their reference manual. The first is a lighting placement document that explains why harsh shadows often act as a “wall wash” that can impinge on the beauty of a ceramic tile wall. This document offers suggestions to alleviate shadow problems.
In general, there are three suggested means of addressing wall shadow problems. The first is to locate light fixtures at least 24 inches away from the wall, preferably in the center of the room. The second suggestion is to avoid the use of ceramic mosaics and scored tile where wall lighting is necessary. And the last suggestion says that maintaining smooth, flat wall or floor surfaces within the standard tolerances established by the American National Standards Institute (ANSI) will reduce shadows.