Step 5: Sill-Flash The Bottom Edge

install watertight skylight put flashing over roofing shingles
Photo: Anthony Tieuli
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Nail roofing shingles over the bottom membrane; the membrane will seal around the nails. Now place the U-shaped sill flashing over the shingles, as shown, and slip it over the skylight's bottom end. Nail the piece to the roof, at the top outside corners of the U, and cover the exposed sides with shingles.
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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