Step 6: Step-Flash The Sides

install watertight skylight overlap shingles over sill flashing with step flashing
Photo: Anthony Tieuli
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Overlap the top half of the shingles that cover the sill flashing with a piece of L-shaped step flashing. Drive one nail near the top outside corner and a second one a few inches below that. Cover the flashing with a shingle, add the next piece of flashing atop that, and so on, up both sides of the skylight.
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    Tools List

    • fall protection harness
      Fall-protection gear
    • chalk line
      Chalk line
    • drill
      Drill/driver
    • 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