Flashing a Deck Ledger.

2 • FOLLOW THE CHALKLINE Align the top of the flashing tape with the snapped line and start bonding the flashing tape 3 in. to 4 in. beyond the end position of the ledger. Finally, a rigid metal or plastic cap flashing sits on top of the ledger and the flashing tape to shed the bulk of the water. My strategy for waterproofing the ledger is installing a redundant flashing system that uses self-adhering flashing tape and rigid cap flashing. This rigid flashing protects the flashing tape from UV-light exposure and covers the clearance space between the top of the deck boards and the bottom of the siding. [Extracted from the article]