How to repair a skylight dome

Written by alexander callos
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Skylight domes are one form of skylights. Along with flat skylights, they are usually found on houses. Skylights with domes add natural sunlight to a room and can brighten up a room that does not normally get much sun. Rain and hail damage can cause the plastic domes on skylights to crack and need to be repaired. Replacing the entire skylight, even where one is already installed, can be a difficult and costly job. For a quick repair to a skylight, there is a method that can save you time and money.

Skill level:
Moderately Easy

Things you need

  • Ladder
  • Ruler
  • Silicone sealant
  • Caulk gun
  • Scissors
  • All weather tape

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  1. 1

    Climb up a ladder to the roof and locate the dome skylight. Run your hands over the dome to check for any cracks or seams in the plastic. Locate all the plastic seams and measure with a ruler to determine the width of the gaps.

  2. 2

    Put a tube of silicone sealant in a caulk gun. Line up the tip of the gun on the edge of the first crack and push down firmly to release the silicone. Run the gun along the entire crack and repeat the procedure for all of the other cracks on the skylight. Wait one hour for the sealant to dry and harden in place.

  3. 3

    Peel off the all weather tape from its backing and cut it to size with scissors so it is slightly bigger than the first seam. Place it directly over the first seam and push down firmly to adhere it in place.

  4. 4

    Cut the second piece in the same manner and continue until all of the seams have been covered with the tape. Feel along the bottom of the dome where it meets the roof and check for any gaps or cracks there. Repair these the same way the cracks on the dome were repaired, using the caulk gun and waiting one hour for the sealant to dry and harden in place. Finish with all weather tape placed directly over the seam, pushing down firmly to adhere it in place.

Tips and warnings

  • The all weather tape is effective for three years and can withstand the outdoor elements.
  • Always be very careful when using a ladder on a roof.

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