Wooden supports for boxes in concealed work must be at least what nominal size?

The nominal size for wooden supports used in concealed work, such as boxes, is set to ensure adequate strength and durability while also fitting within the acceptable practices of construction. A nominal size of 1" x 2" is generally considered sufficient for providing the necessary support in a variety of concealed applications. This size balances the need for stability with the overall dimensions and space considerations within the structure.

In this context, wooden supports function to stabilize fixtures and maintain alignment while being hidden from view, which is why the specified size is crucial for building codes and safety standards. Smaller sizes, like 1" x 2", are typically adequate for lighter applications, whereas larger sizes like 1" x 3" or 2" x 4" might be excessive and impractical for concealed settings. Consequently, 1" x 2" offers a practical compromise for supporting various fixtures without taking up unnecessary space or resources.