Step 7: Counterflash The Sides

install watertight skylight cover step flashing with counterflashing to keep out elements
Photo: Anthony Tieuli
Cover the vertical legs of the step flashing with strips of counterflashing—they snap right onto the rim of the skylight. Counterflashing is the key to sealing out wind-driven rain and snow.
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    Tools List

    • fall protection harness
      Fall-protection gear
    • chalk line
      Chalk line
    • drill
    • circular saw
      Circular saw
    • hammer
      Coil roofing nailer or a hammer
    • snap-off utility knife
      Utility knife

    Shopping List

    1. Skylight kit (includes counterflashing)

    2. Flashing kit (includes self-adhesive membrane; step, saddle, and sill flashing)

    3. Deck screws

    4. Extra roofing shingles

    5. 1½-inch galvanized roofing nails