What is the maximum span for a 2 x 8 nominal floor joist (southern pine #2) installed in a sleeping area with a dead load of 10 psf?

The maximum span for a 2 x 8 nominal floor joist made of southern pine #2, specifically when installed in a sleeping area with a dead load of 10 psf, is determined based on engineering guidelines and building codes which account for factors including wood species, size, load conditions, and the purpose of the space.

For southern pine #2, when considering a typical live load and dead load scenario, the span tables provided in the International Residential Code (IRC) specify that a 2 x 8 joist can effectively span up to 13 feet 3 inches in a residential application such as a sleeping area. This value ensures that there is adequate support and structural integrity while accommodating anticipated loads.

In this context, the choice of 13'3" aligns with common construction practices and safety standards, allowing for the necessary deflection limits and load-bearing capabilities of the joist. This ensures that the floor will be stable and safe for occupancy.

In contrast, spans shorter than this may not utilize the material's full potential while spans longer would exceed the recommended safety margins, potentially risking structural failure. Thus, selecting 13'3" is not only correct but reflects considerations important to sound engineering and good construction practices.