When attaching a wood ledger board to a structure, the IRC provides fastener information for which type of fastener?

The International Residential Code (IRC) specifies that when attaching a wood ledger board to a structural element, it is essential to use appropriate fasteners to ensure the stability and safety of the installation. The IRC recommends the usage of hot dipped galvanized or stainless steel 1/2 inch lag screws or through bolts with washers for this application.

This choice is correct because these types of fasteners provide superior resistance to corrosion, which is crucial in scenarios where the wood may be exposed to moisture or other environmental factors that could lead to rusting and failure of the fastener over time. Additionally, using lag screws or through bolts allows for a more secure attachment, which is essential for supporting loads effectively.

The specific dimensions and types, such as 1/2 inch, indicate the strength and durability needed to safely support the ledger board when it is subjected to various loads, including live loads from the deck or structure it supports. The inclusion of washers also helps distribute the load more evenly and prevents the potential for damage to the wood or loosening of the fastener over time.

Overall, this option aligns with the structural integrity requirements set forth in the IRC for ledger board applications.