Floor Ledger Design

After the concrete has cured workers mark the design height of the floor on the walls and lift the ledger into position.

Floor ledger design.

Standard detail for attaching a ledger to the side of a floor truss gable. Strong drive sdws screws fasten the lvl ledger to the wall. Standard detail for attaching a ledger to the side of a floor truss gable. The workers run screws through each cradle driving them through the ledger board and into the face of the connector.

Proper attachment of the deck ledger to the house is critical for ensuring that an attached deck is safely and securely supported at this location. The inner stud wall that the floor system attaches to sits on the concrete slab which in turn is poured over amvic silverboard insulation. Because this connection is critical to the safety of the deck s occupants both the 2015 irc and the latest edition of the american wood council s dca 6 prescriptive residential wood deck construction guide provide detailed structural design guidance on fastening a deck ledger. When both vertical and horizontal loads are applied the resulting load will be at an angle to the bolt that is somewhere between 0 degrees for purely horizontal loading and 90 degrees for purely vertical loading.

One steel cradle goes around the ledger board at each connector location. With a compressive strength of 35 psi the foam is more than adequate to handle the additional 5 psi from the weight of the floor system. Horizontal loading might come from diaphragm action such as the floor system dragging lateral wind or seismic load into the ledger.