Fixing a Skylight Leak

Complete Guide to Fixing a Skylight Leak

Keeping a home in good condition can be a labor of love, and one area that many homeowners overlook is their skylights. Not only do these windows provide natural lighting and an elevated view of the sky or stars above, but they also contribute to your home’s overall insulation. But when you have a leaky skylight, it can result in compromised air quality along with water damage inside your home – both potentially costly repairs. Check this out. It’s an article to guide you through the steps of properly fixing your leaking skylight so you can enjoy all the benefits that come with having one.

Before discussing how to fix the leak on your skylight, first, Here’s an overview of the reasons for a leaking skylight.

Faulty Skylight

A defective gasket on the skylight glass may be the cause of a leaky skylight. For instance, if there is an accumulation of debris or mold, it can prevent the skylight from closing properly. In this situation, you need to check the gasket and replace it with a new one if necessary. On the other hand, if the skylight glass is cracked, then you need to replace the glass itself.

Faulty Roof Flashing

The roof’s flushing is a metal sheet that surrounds the skylight, chimneys, and other roof penetrations. It is designed to deflect water away from the roof’s surface, which keeps it from penetrating into the home. If the flashing is damaged, broken, or missing in any way, it won’t be able to keep water from entering the house.

Worn Water Sealant

The skylight has a sealant to prevent water from seeping in around the edges of the frame. As with any sealant, it can wear over time and become less effective. Thus causing water to penetrate the skylight frame.


Sometimes, condensation can form on the inside of the skylight and run down the glass. This is not a leak in itself but can cause a leak if it is not addressed. To prevent this from happening, ensure there is proper ventilation in the skylight area to allow air to circulate.

Now that you know the potential causes of a leaky skylight, let’s move on to the steps of how to fix it.

Climb The Ladder

First, ensure that you have a sturdy ladder handy to climb up to the roof. It should be high enough for you to check the skylight from close range and make necessary repairs. Be careful not to place it on power lines or to obstruct doorways.

Inspect The Skylight

Once you are on the roof, check for any visible cracks or damages in the skylight glass. Also, inspect for the presence of debris, mold or other particles that could be preventing the skylight from closing properly.

The Leak May Be From The Roof.

If you don’t find any damage in the skylight itself, check the roof. You may be surprised to note the leak originates from the roof. Missing shingles and clogged gutters could all be potential culprits.

Flashing Leaks

As earlier mentioned leaks can occur due to faulty flashing, so check for any signs of damage such as cracks, holes, or missing pieces. If you observe small cracks, sealing them with silicone or caulk may be enough to fix the issue. For more severe damage, however, it is best to replace the entire flashing or you can call a professional to replace the skylight window.

Skylight Gasket Leaks

If you observe that your skylight is not opening and closing properly, check the gasket for debris or mold. Replacing the gasket with a new one may do the trick.

Worn Water Sealant

When the sealant wears out, replacing it is the best solution. On the other hand, if the damage is not extensive you may opt to add a layer of caulk around the edges of the frame.

Poorly Installed Skylights

If a contractor recently installed the skylight, but you are already seeing a leak, then the leakage could be due to poor installation. In this case, you can ask the contractor to check the installation and make any necessary repairs.

Skylight Replacement When You Need It

Skylights have a lifespan of about 15-20 years. So, if your skylight is too old, replacing it is the most cost-effective solution.

Get A Professional Skylight Roof Installer

If you are dealing with a complicated roof repair, it is best to contact a professional roofing contractor. A qualified roofer will have the right skills and tools to complete the job safely and correctly.

A leaky skylight can be an annoying problem, but it doesn’t have to be. With the right knowledge and guidance, you can fix leaks in your skylight yourself or get professional help if necessary. With proper maintenance and care, you can keep your skylight functioning for years to come.

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