Leaking Skylight Fix: Causes, Solutions & Prevention Tips


Skylights are a beautiful addition to any home or sunroom, allowing natural light to pour in and brighten up the space. However, when a skylight starts leaking, it can quickly turn from a design feature to a frustrating and costly issue. A leaking skylight fix is essential not only for preserving the aesthetic appeal of your space but also for preventing structural damage, mold growth, and interior deterioration.

In this blog post, we’ll explore the common causes of skylight leaks, step-by-step solutions, and tips for preventing future problems. Whether you’re dealing with minor drips or major leaks, this guide will help you take the right steps.

Common Causes of a Leaking Skylight

Understanding why your skylight is leaking is the first step toward a long-lasting fix.

Faulty Installation

One of the most frequent causes of leaks is poor installation. Improper alignment, insufficient flashing, or the use of low-quality materials can leave gaps around the skylight frame, allowing water to seep in.

Damaged or Worn Flashing

Flashing is the metal barrier installed around the skylight to divert water. Over time, it can crack, rust, or lift due to weather exposure, leading to leaks during rainstorms.

Cracked or Broken Glass

Impact from debris, temperature shifts, or aging can cause cracks in the skylight glass. Even a tiny crack can let water in, especially during heavy rainfall.

Failed Seals or Caulking

The seal around the skylight can degrade with age or exposure to UV rays, causing it to shrink, crack, or peel. This can allow water infiltration even if the rest of the unit is intact.

How to Fix a Leaking Skylight

Let’s look at a step-by-step process for addressing the issue.

Step 1 – Inspect the Source of the Leak

Begin with a thorough inspection. Sometimes the leak may appear to be coming from the skylight, but it could actually be due to nearby roofing issues. Use a flashlight to check for damp spots, mold, or water stains around and below the skylight.

Step 2 – Clean the Skylight Area

Dirt, leaves, and debris can trap moisture and make leaks worse. Clean the exterior of the skylight thoroughly, including the flashing and surrounding shingles. A clean surface makes it easier to detect problems and apply repairs.

Step 3 – Reseal with Caulk

If the problem lies in deteriorated caulking, use a high-quality, weatherproof silicone caulk to reseal the edges. Remove old caulk using a putty knife before applying the new sealant. Ensure full coverage around the frame to prevent any gaps.

Step 4 – Replace Damaged Flashing

If flashing is damaged or improperly installed, it may need to be replaced. This involves removing shingles around the skylight, lifting the old flashing, and installing a new, properly-fitted piece. For major flashing repairs, consider professional help.

Step 5 – Repair or Replace the Skylight

In cases where the skylight glass is cracked or the entire unit is failing, replacement may be the only solution. Look for energy-efficient, double-glazed skylights with durable seals and quality flashing kits.

When to Call a Professional

Some skylight leaks are simple enough for DIY fixes, but others require expert intervention. Here’s when to bring in the pros:

Complex Roofing Structures

If your skylight is part of a larger sunroom or custom roof structure, improper handling could cause more damage.

Persistent Leaks After DIY Fixes

If leaks continue even after sealing or minor repairs, the problem may be deeper than you can see. A professional assessment can uncover hidden damage.

Skylight Replacement Needs

A full Leaking skylight fix may require removing and replacing the unit. Professionals ensure proper fit, sealing, and structural integration.

To find a trusted repair service near you, visit Alumwave’s skylight and sunroom services for experienced solutions tailored to your home.

Preventing Future Skylight Leaks

Prevention is key to avoiding costly repairs in the future. Here are practical steps you can take:

Regular Inspections

Check your skylight and surrounding roofing at least twice a year. Look for signs of wear, especially after major weather events.

Maintain Clean Gutters

Clogged gutters can cause water to back up onto the roof and leak into the skylight. Clean your gutters regularly to ensure proper drainage.

Re-Caulk as Needed

Sealant wears out over time. Inspect and replace caulking every few years to maintain a watertight barrier.

Consider Skylight Covers

Installing skylight covers or UV-protective films can help extend the life of the glass and seals by minimizing sun and debris exposure.

Final Thoughts

A skylight can enhance the beauty and value of your home, but it comes with the responsibility of maintenance and timely repairs. Whether it’s a cracked pane, failing seal, or improperly installed flashing, tackling a leak early can save you thousands in damage.

For expert repair and replacement services, including sunroom and skylight upgrades, trust local professionals like those at Alumwave who specialize in efficient, lasting solutions.

By following the right steps and seeking professional help when necessary, you can enjoy the natural light and aesthetic appeal of your skylight without the headache of leaks.

Location: Canada

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