California Residential Inspector Practice Exam

What is the maximum allowable span for a 2x8 header in an exterior bearing wall supporting a roof and ceiling with a ground snow load of 30 psf?

1. 5 feet

2. 5 feet 9 inches

3. 6 feet

4. 6 feet 3 inches

The correct answer is: 5 feet 9 inches

The maximum allowable span for a 2x8 header in an exterior bearing wall supporting a roof and ceiling is determined by various factors, including the type of load it must support and the material properties of the lumber. In the case of a 2x8 header with a ground snow load of 30 pounds per square foot (psf), the correct span of 5 feet 9 inches reflects the structural calculations based on typical load-carrying capacities for standard lumber. The span limit accounts for both the roof and ceiling loads as well as any potential additional loads that may affect the structural integrity of the header. For 2x8 headers, typical maximum spans are informed by local building codes and engineering tables that specify allowable spans based on material grade, load conditions, and safety factors. Since 5 feet 9 inches falls within these guidelines for the specific load conditions mentioned, it is recognized as the appropriate measurement for this scenario. Understanding these spans helps ensure the safety and durability of the structure while adhering to building code requirements, which are designed to mitigate risks associated with structural failure due to excessive load or material fatigue. Having accurate spans for headers is crucial in residential construction and can influence the overall design of the framework and roof support.