What is the maximum allowable span for header joists framing openings in steel floors?

The maximum allowable span for header joists framing openings in steel floors is correctly identified as 6 feet. This span is determined based on the structural engineering principles and building codes intended to ensure safety and stability within a construction project.

Header joists serve a critical function, as they redistribute loads surrounding openings in floors, such as doorways or windows. The 6-foot span allows for adequate support of the loads without causing excessive deflection or potential failure of the flooring system. This measure helps in maintaining the integrity of the structure, particularly in steel frameworks where proper load distribution is essential due to the materials involved.

Understanding these specifications is crucial for compliance with construction standards and ensuring the safety of the building's occupants. Knowing the limitations of header joist spans not only assists in optimal design practices but also in adherence to local building codes that govern structural components in construction projects.