What is a ledger board?
A horizontal board bolted to the house rim joist that anchors a deck structure and transfers its weight and load forces to the home's foundation.
The ledger board is a horizontal member fastened to the house's rim joist or band board. It serves as the anchor point where the deck attaches to the structure, and it carries half the load of the entire deck, including the weight of the framing, decking, railings, and snow load in the Greater Charlotte area.
Proper installation requires lag bolts or through-bolts spaced according to code, typically 16 inches on center along the full length of the ledger. These fasteners must penetrate the rim joist and reach the house band or rim band board to transfer the deck load securely into the home's foundation system. Undersized fasteners or loose bolts create a serious structural risk, as the ledger can separate from the house under stress.
Flashing is equally critical. Water must not be allowed to sit between the ledger and the house, as moisture will rot the rim joist and the ledger itself, compromising the connection. Metal flashing must be installed under the ledger and extend down the rim joist before bolting, and the top edge must be sealed with caulk or roofing cement to direct water away from the house.
Local building codes in the Charlotte area require this work to be done right because a failed ledger connection can cause deck collapse. When planning a deck project, work with an experienced builder who knows how to run the flashing correctly and space fasteners to code.