What is the primary purpose of a ledger board?

The primary purpose of a ledger board is to support floor joists and effectively distribute their load to the underlying wall structure. By providing a stable and secure anchoring point for the joists, the ledger board helps maintain the structural integrity of the flooring system, ensuring that weight is transferred appropriately and safely to the walls. This is critical in construction, especially in multi-story buildings or decks, where the load-bearing capacity is essential for safety and durability.

The other options do not accurately describe the role of a ledger board. Decoration, insulation, and weather barriers are separate elements within building design and construction, each with distinct functions that do not pertain to the core purpose of a ledger board in supporting and distributing loads.