Step 1: Mark and cut a rough opening

Mark the skylight opening and cut out rough opening with a drywall saw
Photo: John Nasta
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Start by marking the rough opening of the skylight on the ceiling and knee wall. Position the bottom of the sill 38 to 44 inches above the floor. Align the side of the opening with the inside edge of a rafter. Cut along the lines with a drywall saw and pull the drywall from the rough opening.
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    Tools List

    • 16-foot tape measure
      Tape measure
    • hammer
      Hammer
    • drill
      Drill-driver
    • drywall saw
      Drywall saw
    • reciprocating saw
      Reciprocating saw
    • drywall knife
      Drywall knife

    Shopping List

    1. Venting skylight with flashing kit

    2. 2x4s
    used to reframe sill

    3. 2x12
    used to form a header over the skylight

    4. 15-pound roofing felt

    5. Drywall
    used to cover the interior surfaces around the skylight

    6. Corner bead
    used to protect the drywall corners

    7. Joint compound

    8. Drywall tape

    9. 1 1/2-inch drywall nails
    used to attach corner bead

    10. 1/2-inch plywood
    used to create viewing shelf

    11. Primer and paint