When is back finishing or sealing required for casework?

Back finishing or sealing of casework is required primarily as a protective measure to prevent moisture damage and enhance durability. This process is especially critical for factory-finished casework prior to delivery because it helps ensure that the surfaces are adequately protected during shipping and handling. When the casework arrives at the installation site, proper sealing on the back prevents moisture from seeping into the material from the environment, which could lead to warping or other damage over time.

The requirement for back finishing is closely tied to industry standards and practices, as well as the nature of the materials used. Factory-finished items are often more vulnerable during transport and installation, and ensuring they are properly sealed increases their longevity and performance in the installed environment. Therefore, option B accurately reflects the responsibility of manufacturers to provide well-prepared products that will withstand the stresses of being moved and used in varied conditions.