What is the maximum spacing for a 2 x 6 in a bearing wall that supports a roof and ceiling?

The maximum spacing for a 2 x 6 in a bearing wall that supports a roof and ceiling is indeed 24 inches on center. This spacing is based on the structural requirements and load considerations for typical residential construction. A 2 x 6 lumber is capable of supporting significant loads when adequately spaced.

The 24-inch on-center spacing allows for proper load distribution and effective use of materials while ensuring that the wall maintains its structural integrity under the weight of both the roof and any additional loads from the ceiling. It also allows adequate space for insulation, electrical wiring, and plumbing if needed.

In the context of construction codes and best practices, this spacing meets the standards set for building safety and durability, ensuring that the overall structure can withstand the stresses imposed by the roof and any environmental factors. This configuration is commonly used and accepted in residential building practices.