What is the maximum spacing for an interior bearing wall framed with 2 x 6's supporting a roof and ceiling?

The correct spacing for interior bearing walls framed with 2 x 6 lumber, particularly those supporting both roof and ceiling loads, is 24 inches on center. This maximum spacing is specified because 2 x 6 framing provides adequate structural support when positioned within these parameters.

Framing members must be capable of transferring loads efficiently; hence, the selection of spacing is crucial for maintaining the wall's strength and stability. When spaced more than 24 inches on center, the risk of structural failure increases because the wall may not adequately support the roof and ceiling loads, especially under additional stresses such as wind or snow.

The choice for 24 inches on center provides a balance between material efficiency and structural integrity, thereby meeting the standards prescribed by the building codes. Using this spacing allows for appropriate load distribution and ensures compliance with safety requirements for residential construction.