Step 4: Seal The Sides

install watertight skylight seal sides with membrane
Photo: Anthony Tieuli
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Cover the bottom flange with a strip of membrane that extends 6 inches past the skylight's sides. Cut the extensions at a 45-degree angle out from both corners of the skylight. Wrap the top part around the skylight's frame, as shown, and press the other part against the roof. Cover the side flanges, then the top, in the same way.
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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