With a ground snow load of 30 psf and a dead load of 10 psf, what is the maximum rafter span for 2x6 southern pine #2 rafters?

To determine the maximum rafter span for 2x6 southern pine #2 rafters, it's essential to consider both the snow load and dead load, as they combine to form the total load that the rafters must support.

A ground snow load of 30 pounds per square foot (psf) adds considerable weight, and when combined with a dead load of 10 psf, the total load equals 40 psf. Building codes often provide span tables that indicate the maximum spans for specific lumber types and sizes under varying load conditions. For 2x6 southern pine #2, these tables are based on bending and shear strength, as well as deflection criteria.

In this case, when searching the span tables for 2x6 southern pine rafters subjected to a total load of 40 psf, you'll find that they can safely span up to 14 feet. This specific span meets the requirements for structural integrity under the combined loads provided in the question.

Thus, the correct choice reflects the maximum allowable span that balances safety, structural requirements, and the lumber used in construction.