In wall installations, plywood backing should be installed at what distance above the finished floor?

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A solid backing behind the wall surface is needed so you have a reliable nail/screw anchor for devices and brackets, especially where you don’t have a continuous stud at every spot. Placing the plywood backing about 6 inches above the finished floor puts it in a practical, accessible zone that clears the baseboard and floor finish and provides enough depth behind the wall for secure fasteners. This height also helps align mounting for common low-position devices and keeps the backing out of the path of future trim or flooring transitions. If the backing sits too low, it can be damaged by furniture, cleaning, or floor materials; if it sits too high, you lose usable mounting area and risk interference with baseboards. Six inches above the finished floor balances these considerations and ensures a stable mounting surface.