Ledgers, or “ledger boards”, are arguably the single most critical structural component in a deck. Ledger failure is the cause of the majority of catastrophic deck collapses.
Table 5 provides critical information on the required fastener type and spacing for a ledger based on the joist span, fastener, and wood species.
Figures 19 and 20 detail the proper placement and selection of ledger fasteners.
While the ledger attachment details are not always visible, it is essential to understand the requirements. Figures 14 and 15 provide that.
DCA6 requires so-called “lateral load devices” for decks attached to the house. The installation requirements depend on the relationship of the house and deck joists. Figure 22 is for when the joists are parallel.
Figure 23 provide installation details for when the joists are perpendicular.