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It attaches the deck to your house and it is also provides the reference point for laying out the deck for construction. Because of its importance, the ledger must be correctly positioned and fastened very securely to the house.
Pressure-treated lumber is the preferred material for the ledger. It is very sturdy and resists rot and pests. It should be secured directly to a header joist or to a masonry foundation for maximum strength. For installation into a header joist, you will use lag bolts. Masonry installation requires anchors that expand as the lag bolts are screwed in.