How to Repair a Leaking Skylight

By: Danny Lipford

I had my roof reshingled and the skylight len replaced, but my skylight is still leaking. Is there was some sort of sealant I can apply to fix it? -Robert

Hi Robert,

There are several possibilities as to why your skylight is leaking. The leak might not be a leak at all, but the result of condensation forming on the inside of the glass during cold weather. It could also be caused by an unrelated roof leak above the skylight that is finding its way out through the ceiling opening around the skylight.

If the leak appears to be coming from the skylight itself, start by cleaning around the skylight to remove any leaves or debris. Next, examine the exterior of the skylight and flashing carefully for any gaps or flashing that may have been improperly installed.

If you still can’t find the source of the leak, use a garden hose to try and reproduce the leak and narrow it down. Is the water coming from the lens, the frame, or the flashing around the skylight?

Depending on the location of the leak, you may need to:

  • Use roofing cement (can or tube) to seal any gaps or holes in the flashing.
  • Apply 100% silicone caulking (tube) to seal leaks around the skylight lens.
  • Replace or repair the metal flashing around the frame of the skylight.

Try making the easier repairs with roofing cement or silicone caulking first before tackling more difficult fixes, like replacing the flashing.

Good luck with your project,

Danny

Further Information

Print


Comments

Please Leave a Comment

7 Comments on “How to Repair a Leaking Skylight”

You can follow comments to this article by subscribing to the RSS news feed with your favorite feed reader.


  • CHETHAN Says:
    May 19th, 2016 at 4:08 am

    Hi Am an architect, one of project we got leakage problem, its very hot area in summer between April to May it reaches 40 to 45 degree temperature. The skylight which we have given is one side its is inserted to 1 1/2″ deep, this is upper end, lower end is free, skylight size is 1 1/2″ x 18′. There is joint in glass too. We have applied sealant and other waterproof materials still its coming out. When it rains at few point, please anyone recommend me the solution.



  • maggie Says:
    January 23rd, 2016 at 7:00 am

    sun roof extension… rubber roof installed (shingled as well????) flashing also installed (2 years ago.).. now have drip from ceiling fixture.. ironically this was not the reason for the roof replacement….. no attic access … roofers (2) could not locate source of leak… tarred entire roof.. still have drip from fixture.. now what????



  • Joe Colcasure Says:
    August 22nd, 2015 at 9:14 pm

    Our skylights were functioning without problems until we had roof shingles replaced. Now we have marked leakage from 2 of our 3 skylights. We had some leakage in years past but I resolved personally with application of silicone paste around the periphery of the skylight. They have been functioning without lead for over a year until we had the roof repaired. After roof repair, we now have marked leakage from two of the three skylights.

    Contractor says that skylights are not his reponsability and that the skylights are old—bubble type and need top be replaced–which he will be happy to arrange. I have stated that the skylights were not leaking prior to his repair. The skylights now leak after his repair. I believe it his reponsability to leave the roof completely water repellant after his repair as it was before his repair.
    Your comments?
    Joe



  • CHETHAN Says:
    May 19th, 2015 at 7:15 am

    we have 4 skylights. One end glass is fixed to wall, other end is free end. We used lot of silicon and there is leakage. How to solve this? Please help with best materials and best methods.



  • Randy Says:
    January 2nd, 2015 at 11:50 am

    The sky light only leaks when there is frost or ice etc. When it rains the sky light doesn’t leak at all. When frost is gone no leaking, one corner only (bottom). Any fixes for this???
    Randy



  • cindy flanders Says:
    August 28th, 2011 at 11:49 am

    trying to find an episode, i think you did on the weather channel on replacing a skylight and how to flash around it, could you supply information on how to view this again?



  • Alma Says:
    June 21st, 2010 at 7:46 am

    I have sky lights & they do not leak.But they make the room really hot in the summer.You can tell a temperature difference from the other rooms that do not have sky lights.Also they fade the furniture.The sky lights are new & they are not glass.Please help.
    Hot in South Carolina


We want to hear from you! In addition to posting comments on articles and videos, you can also send your comments and questions to us on our contact page or at (800) 946-4420. While we can't answer them all, we may use your question on our Today's Homeowner radio or TV show, or online at todayshomeowner.com.