05/03/2026
Here's some great info for the DIYers out there
Deck Ledger Attachment and Waterproofing
This technical illustration demonstrates the critical interface where an exterior deck meets a residential structure. It highlights the layered assembly of structural framing, moisture barriers, and shedding mechanisms necessary to prevent water intrusion into the building's envelope while maintaining structural integrity between the deck and the house.
Key Components & Features
Foundation and Sills: The system begins with a concrete foundation supporting a Sill Plate (1), which provides a level transition to the wood framing. The Band/Rim Joist (2) sits atop this, forming the perimeter of the floor's structure.
Wall Framing: The vertical load-bearing structure consists of a Wall Bottom Plate (3) and Wall Studs (4), which are secured above the floor platform.
Deck Integration: A Ledger Board (5) is bolted through the house wrap and sheathing into the rim joist using heavy-duty fasteners (6). This board supports the deck joists via metal hangers.
Moisture Protection: House Wrap (7) provides a primary water-resistive barrier over the sheathing. This is integrated with Flashing (6)—the red metal component—which is tucked behind the house wrap and over the ledger to direct water away from the house.
Finish Materials: The Siding (8) is installed with a gap above the flashing to allow for drainage, ensuring the exterior aesthetic doesn't compromise the water-shedding system.
Design Summary
The image effectively illustrates the "shingle-lap" principle of construction, where each layer overlaps the one below it to ensure gravity carries water down and away from the structural wood. Proper ex*****on of the ledger-to-rim joist connection is vital for safety, while the integration of flashing and house wrap is the primary defense against rot and long-term structural failure.
