Flashing A Roof Ledger Board

Snap a chalk line cut out the siding and tack up the ledger board.

Flashing a roof ledger board.

This first piece of flashing needs to extend up at least 2 inches behind the deck ledger board. Make the outline large enough to include space for the deck boards on top the ledger and any trim boards on the sides. Properly installing a ledger board for your deck is one of the most important structural components of building a safe and strong deck. Galvanized steel and aluminum flashing can experience accelerated corrosion when in contact with treated lumber.

Then slip flashing behind the siding covering the top edge of the ledger. Metal or plastic cap flashing covers the top of the ledger with a drop leg of 1 2 in. When slipping the flashing under the siding be sure to slide the flashing to the left or right of the ledger by at least 2. Or more on the face of the ledger and a 6 in.

Slip the siding up and around the door slip the back flashing under the siding at least 3 at the top and the sides. You then attach the ledger board to the wall using approved through bolts not lag bolts. This will ensure water doesn t infiltrate behind the flashing. Flashing a patio roof ledger unless it will be protected from rain by the house s eaves or a solid roof a roof ledger that is fastened directly to a house with wood siding should be capped with galvanized metal z flashing that tucks up under siding to prevent water from seeping in behind it.