What is a ledger commonly used for in construction?

A ledger is a horizontal board typically fastened to a structural element of a building, and its primary function in construction is to support the joists of a deck. When constructing a deck, the ledger is attached to the side of a building or an existing structure, providing the essential support needed for the deck joists to rest on. This helps distribute the weight of the deck evenly and ensures stability, making it a critical component in the overall structure of the deck.

In contrast, the other options pertain to different construction applications that do not involve the specific purpose of a ledger. Securing roof rafters involves differing methods such as the use of collar ties or ridge beams. Attaching siding would generally require different components like furring strips or sheathing to properly secure the siding material. Framing window openings usually involves structural framing techniques that provide the necessary support for the window units, which is also separate from the role of a ledger. Therefore, recognizing the unique role that a ledger plays in supporting deck joists is essential in understanding construction terminology and methods.