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How to Add Missing Flashing to a Deck

One of the most crucial elements to building a deck is ensuring that there is flashing covering the ledger board along the edge of the house. The ledger board is the only part of the deck that is flashed, and it is the board on top of which the deck boards rest, along with the other deck joists. The flashing runs underneath the siding, over the top of the ledger board, and down over the face to protect the wall of the house from water penetrating. Before you can install the deck boards, you have to install any missing flashing.

Things You'll Need

  • Z-flashing
  • Silicone caulking
  • Siding removal tool
  • Hammer
  • Drill
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Instructions

    • 1

      Pry up the bottom edge of the siding that is in place above the ledger board. With vinyl siding, you can use the curved siding removal tool to hook up under the edge of the vinyl siding. For other types of siding, you can either pry with your hands or use the claw of a hammer to help pull the siding up and out of the way. Remove any nails or screws as necessary to loosen the bottom row of siding.

    • 2

      Apply silicone caulking along the top edge of the ledger board as well as up on the wall under the bottom edge of the lowest piece of siding. Install the Z-flashing in the bed if you're using silicone caulking. Slide the top, vertical edge of the flashing up under the bottom row of siding, with the horizontal section resting on top of the ledger board and the other vertical section down over the face of the ledger board.

    • 3

      Reattach the siding according to the manner in which it was initially installed, either with nails or screws. After the siding is reattached, install your deck boards according to the manufacturer's installation instructions, based upon if you are working with composites, wood or vinyl. In all cases, the edge of the boards will rest on top of the flashing where they butt up against the house.

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Remodeling Plans
  1. How to Mount a Carport to Siding
  2. How to Add Stringer Stairs to a Small Porch Deck
  3. How to Maintain Deck Flashing
  4. How to Install a Deck Against Siding
  5. How to Add a Rain Shade to a Deck
  6. How to Add Small Handrails to Deck Stairs
  7. How to Flash a Deck
  8. How to Add Decking to a Deck
  9. How to Add Shade on a Deck
  10. How to Connect a Deck Ledger Flashing to a House
  11. How to Add Foam Board & Siding
  12. How to Add a Ledger for a Deck

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