Step 2: Protect the Ledger

protecting the ledger on an on-grade deck
Photo: David Carmack
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Cut a strip of self-adhering waterproof membrane 6 inches wide and the same length as the ledger.

Fold the membrane lengthwise along its center line to form a right angle. Apply it over the ledger-to-house joint so one leg covers the top of the spacer blocks and ledger and the other leg extends up the wall.

Cut a strip of metal flashing at least 6 inches wide and as long as the ledger. (If more than one strip of flashing is needed, overlap the ends by 3 inches and bed them in siliconized acrylic caulk.)

Fold the metal lengthwise to form a right angle. Apply it over the waterproof membrane.

Drive roofing nails through the flashing’s top edge every 8 inches.

Fasten concealed-flange double joist hangers at both ends of the ledger and flush with its bottom edge, using joist hanger nails.
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    Tools List

    • hammer drill
      Hammer-drill with masonry bit
    • drill
      1/2-inch drill with 3/8-inch bit
    • socket wrench
      Socket wrench
    • plumb bob
      Plumb bob and string
    • circular saw
      Circular saw
    • two-foot level
      Level
    • chalk line
      Chalk line
    • concrete mixer
      Concrete mixer,
      or mixing trough and hoe
    • hammer
      Hammer
    • impact wrench
      Impact wrench
    • flat blade shovel
      Shovel
    • 16-foot tape measure
      Tape measure
    • utility knife
      Utility knife

    Shopping List

    1. 5X4-INCH DECKING LUMBER

    2. 2X8 PRESSURE-TREATED LUMBER for the joists

    3. 2X10 PRESSURE-TREATED LUMBER for the ledger, beams and rim joists

    4. FIBERBOARD PIER FORM

    5. PLASTIC FOOTING FORM

    6. CONCRETE

    7. LEDGER FASTENERS lag screws and/or carriage bolts

    8. POLYURETHANE MARINE SEALANT

    9. FACE-MOUNTED JOIST HANGERS

    10. POST BASES

    11. MASONRY EXPANSION BOLTSto fasten post bases to concrete piers

    12. SILICONIZED ACRYLIC CAULK

    13. METAL FLASHING

    14. 6D, 12D, AND 16D GALVANIZED OR STAINLESS STEEL COMMON NAILS

    15. 8D GALVANIZED OR STAINLESS STEEL FINISH NAILS

    16. 5/8-INCH ROOFING NAILS

    17. SELF-ADHERING WATERPROOF MEMBRANE

    18. CONCEALED-FLANGE AND FACE-MOUNTED DOUBLE JOIST HANGERS AND HANGER NAILS

    19. CONSTRUCTION ADHESIVE