Wall Mount For Bath Sink： The included hardware will work with multiple construction materials including concrete and standard dimensional lumber. A wood backing may be required if not fasting into a solid stud or a concrete wall. If the installation of backing is necessary refer to the fixture and local plumbing codes for proper spreads and elevations (DO NOT FASTEN DIRECTLY INTO PLASTER OR DRYWALL WITHOUT ANCHORING TO A SOLID STUD OR ADEQUATE SOURCE) Use caution when drilling as plumbing or electrical lines may be present behind walls.