What level of finish is most commonly used in places not in view during normal use?

The most commonly used level of finish in places not in view during normal use is economy grade. This designation refers to a finish that prioritizes cost-effectiveness and sufficient functionality over aesthetic appeal. Areas that are not in direct view or are less frequently accessed typically do not require the higher quality and more visually appealing finishes associated with custom or premium grades. Therefore, opting for an economy finish in such locations is a practical choice for maintaining budgetary constraints while still providing a satisfactory level of performance.

On the other hand, custom and premium grades are designed specifically for areas where aesthetics and high-quality finishes are critical, such as in visible living spaces or high-profile projects. General grade can be somewhat ambiguous but often falls between economy and custom grades, making it less applicable for spaces that are out of sight and do not necessitate high-quality finishes.