According to IRC regulations, what are the maximum dimensions for using steel for floor framing in residential structures?

The maximum dimensions for using steel for floor framing in residential structures according to the International Residential Code (IRC) are determined based on structural performance and safety considerations. The correct choice indicates that steel framing can have a maximum length of 60 feet, a width of 40 feet, and can support up to 3 stories.

These dimensions are derived from a balance between structural integrity, material properties, and practical considerations in design. Steel is favored for its high strength-to-weight ratio, allowing longer spans with fewer supports. However, there are limits to ensure safety, minimize deflection, and maintain proper load distribution.

In residential construction, defining these limits helps to standardize practices and ensure that buildings can withstand various loads while remaining economical and manageable in construction. This reflects best practices within the industry and the IRC's attempt to provide guidelines that ensure both safety and efficiency in residential building design.

Understanding these pivotal dimensions can also inform builders and inspectors about when to consider alternative framing options or to reinforce structures where necessary.