What Is a Deck Ledger?
Deck Ledger is a horizontal board that attaches a deck to a building and supports the deck framing at that connection. The ledger transfers part of the deck load to the structure. Proper placement, fasteners, flashing, and drainage details help keep water from entering the wall behind the board.
Quick Facts About Deck Ledger
Category
Deck framing component
Used for
Connecting attached deck framing
Common confusion
Often confused with a deck joist
Also called
Ledger board
Often discussed with
Deck Installation
Key Takeaways About Deck Ledger
- A ledger connects the deck to the building.
- Flashing helps protect the wall connection from water.
- A ledger is not the same as a deck joist.
How Deck Ledger Works
A Deck Ledger sits against the building and connects the deck frame to the structure. Deck joists meet the ledger and extend outward to support the deck surface. The ledger carries part of the frame load at the building connection.
Related glossary terms: Deck Joist, Deck Post, Deck Railing.
Installers check the ledger's position against the building layout and the planned deck height. They also plan the connection so water can move away from the wall. Flashing covers vulnerable areas and helps limit water entry behind the ledger.
The ledger must align with the rest of the frame. A mismatch can affect the deck surface, stairs, railing layout, and drainage. The connection also needs to work with the building's siding and existing structure.
Expert Note
When we install a deck, we check the ledger location against the building structure and finished deck height. We also review the joist layout, flashing path, siding, and drainage details. These checks help the ledger connect cleanly without trapping water behind the deck frame.
Deck Ledger in Practice: A Real-World Example
For a raised deck beside an Issaquah home, the ledger sits along the house wall at the planned deck height. The joists connect to the ledger and run outward to support the deck boards.
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Related Terms
Deck Joist
Deck Joist is a horizontal framing member that supports deck boards and transfers their load to…
Deck Post
A Deck Post is a vertical support that carries a deck’s framing and transfers its weight…
Deck Railing
Deck Railing is a barrier installed along the open edges of a raised deck, stair, or…
Footing
A footing is a widened base that supports a deck post, pier, wall, or other structure…
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