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Why Skylights Are So Leak‑Prone

There's nothing worse than when an attractive feature becomes a repair problem. Many skylights fall into this category.

Leaks around skylights are one of the most common, and frustrating, roofing problems because skylights combine an opening in the roof, glass, framing and complex flashing. When any of those fail, natural light isn't the only thing coming through the skylight. Water takes the path of least resistance straight into your home.

If you're in this situation, the first step is understanding the reasons behind a leaking skylight. From there you can figure out what skylight leak repair measures need to be taken.

Skylights are inherently more vulnerable than a standard roof plane because it's a large penetration point that interrupts the natural flow of water down the roof. Each of the transitions from glass to frame, frame to flashing and flashing to shingles is a potential weak spot.

Common reasons this area is so susceptible include:

A large concentration of seams, fasteners and sealants in a small footprint.
More exposure to UV rays, temperature swings and ponding water than flat roof sections.
Less structure and support.

Just imagine if the skylight wasn't there, and it becomes more clear why this spot of the roof is more prone to leaks.

Main Causes of Skylight Leaks

It's clear that skylights are a vulnerable spot of the roof. A number of issues can be at play when leaks are spotted. You can group most skylight leaks into one of five buckets:

1. Improper Installation

If the skylight is poorly installed it won't be set square, level and at the right height. This allows gaps to open between the frame and roof deck. Missing or incorrectly layered underlayment allows water to run under, not around, the skylight.
2. Flashing Problems

Poorly installed flashing around skylights lets water bypass the intended channels. Instead, it goes into the roof assembly. On low‑slope roofs, inadequate cricket or diverter design behind a wide skylight leads to water pooling and eventually leaking at corners.
3. Aging or Failed Domes, Seals and Gaskets

Rubber gaskets and sealants around the frame of a skylight can dry out, crack or shrink from UV exposure and temperature changes. When it does it creates pinhole leaks and weeping corners. Older plastic or acrylic domes can warp over time, pulling away from their frames and opening up joints.
4. Roofing Issues Around the Skylight

Missing, cracked or improperly cut shingles and tiles that are next to the skylight frame let water track sideways into the opening. Debris buildup traps water around the frame, turning the area into a tiny pond that eventually finds its way inside.
5. Condensation Misdiagnosed as a Leak

Warm, moist indoor air rises, hits the cold skylight surface and condenses. The resulting water can drip from the frame or drywall, mimicking a roof leak. Poor ventilation, blocked weep holes and inadequate insulation around the shaft can make condensation worse.

What Skylight Leaks Can Do to a Roof and Interior

Water leaking from a skylight is a serious issue that shouldn't be ignored. When it's caught quickly it can be a simple fix, but leaks that are allowed to continue often require more expensive repairs to remedy:

Ceiling and Wall Stains: The most visible sign is brown rings or streaks on drywall near the skylight opening.
Rotting Deck and Framing: Persistent leaks at the curb or corners soak roof sheathing and rafters, leading to soft spots mold, and eventually structural weakening.
Insulation Damage: Wet insulation around the skylight shaft clumps together and loses R‑value. This increases energy costs and encourages more condensation.
Mold and Indoor Air Quality Issues: Chronic dampness in the shaft or attic space around the skylight promotes mold growth that can spread beyond the immediate leak area.
Skylight Failure: Long‑term water exposure can degrade the frame, cloud the glazing and corrode fasteners, sometimes forcing full replacement sooner than expected.

Leaky Skylight Repair: Steps to Take to Fix the Problem

A good repair starts with pinpointing the source of the leak rather than just caulking everything and calling it a day. It's a multi-step process but one that will help the skylight perform as expected so that it's an enjoyable feature, not a source of stress.

1. Diagnose the Source of the Skylight Leak

Inspect the skylight from the roof to look for: rusted, loose or missing flashing pieces; cracked shingles/tiles; ponding behind the skylight; gaps between the frame and roofing.
Inspect from inside to look for: water stains; damp insulation; where drips originate – top, sides, corners or along the shaft.
Differentiate true leaks from condensation by watching when it occurs. If it only happens during rain that suggests an exterior leak. If it appears in cold weather regardless of rain, it points to condensation.

2. Address Flashing and Roof Integration Issues

If it's a true leak at the roof–skylight interface you'll need to: remove the roofing material around the skylight to expose the flashing; replace incorrectly installed or damaged flashing with a proper kit or site‑built system, ensuring correct step‑flashing sequence, head flashing and apron flashing is used; on low‑slope roofs or wide skylights, install or improve a cricket/diverter to move water around the uphill side instead of letting it pool; re‑roof around the skylight, weaving roofing materials correctly with the new flashing.

3. Repair or Reseal the Skylight Unit

If the frame, sash or seals are an issue you'll also need to: remove old, failed sealant and gaskets then clean the surfaces thoroughly; apply manufacturer‑approved sealants and replace worn gaskets to restore a watertight bond at frame joints and frame‑to‑curb transitions; for cracked domes or glass with broken seals, replacement of the glazing unit or the entire skylight is often the most reliable long‑term fix.

4. Fix Condensation-Related "Leaks"

Improve attic and room ventilation to reduce humidity. Add or upgrade insulation around the skylight shaft and ensure an air‑tight air barrier so moist interior air doesn't reach cold surfaces. Clear factory weep holes in the frame so any incidental water drains outside instead of into the interior.

5. Repair Related Interior Damage

Once the exterior leak is resolved, remove any wet insulation, dry the cavity completely and install new insulation. Cut out water‑damaged drywall or plaster, treat any mold and patch or paint as needed.

What to do to Prevent Future Skylight Leaks

Insist on Proper Installation: Use experienced installers and follow the skylight manufacturer's flashing and underlayment details precisely.
Use Quality Units and Flashing Kits: Modern, curb‑mounted, factory‑flashed skylights from reputable brands have much lower leak rates than old site‑built assemblies.
Maintain the Roof: Roof maintenance is a great idea for the entire roofing system, including skylights. Keep roofing materials and underlayment around skylights in good shape by clearing debris, leaves and ice that can trap water.
Inspect Regularly: Check seals, flashing and the surrounding roof annually and after major storms. Reseal or repair at the first sign of wear.
Manage Indoor Humidity: Use ventilation, dehumidification and proper insulation to minimize condensation, especially in bathrooms, kitchens and high‑moisture spaces with skylights.

Skylights don't have to leak, but they demand precise installation and regular maintenance. Most leaks can be traced back to the skylight installation and whether it's maintained as carefully as the rest of the roof.

If you've noticed signs of a leak around your skylights or any other issues, contact the professional roofing contractors at LOA. We can provide a free inspection that determines if the issue is due to regular wear or if the old skylight wasn't installed correctly. You can schedule an inspection online or over the phone.

We're One of the Highest Rated
Roofers in Austin for a Reason

At LOA, we believe success is defined by customer satisfaction. We're proud to say we have some of the happiest clients in the roofing industry! You can find hundreds of 5-star reviews like the ones below online.

"I got three inspections and decided to use LOA Construction for a new roof. LOA's Dan Harvey worked with my insurance inspector to make sure all the hail/wind damage was accounted for, gave us a good choice of shingle colors, and was great at communicating. The workers did quality work, found and repaired rotted wood and cleaned up. Highly recommend!"

— Brian McFarlin, 5-Star Google Review

"Brandon at LOA construction made replacement of our roof very easy. He was the only roofing contractor that I could find that would work directly with our insurance company. They showed up on time and made the whole process very easy. And we have a great looking high quality roof! I Would definitely recommend them to anyone looking for a new roof. Give them a call if you need a roof or think you might have wind or hail damage. I had several other bids that were higher cost and didn't think our insurance would cover it. Our insurance did cover it, I think they were just unwilling to work with the insurance company. Not Brandon, not only was he will to work with our insurance he met with the adjuster and made the whole thing a breeze. Thanks again LOA and Brandon!!!!"

— Mike A., 5-Star Google Review

LOA Construction has exceeded my expectations again. This is the second roof installation with them and I couldn't be happier. Specifically, Tyler Griffiths is professional, attentive, and made the entire process of working with my insurance company effortless. My tenant sent a glowing account of their experience as well. Knowing it was a rental, they still diligently protected all property and plants. They were on time every time and went out of their way to not inconvenience the residents. LOA Construction has integrity and takes pride in their work. I couldn't recommend them more.

— Sheri Moran

"Worked with Zac and his team. Zac did an outstanding job working with the insurance company to ensure all damage was covered. Roof and gutters installed each were on time and all work was top of the line. This is a company that really does put the customer first. With out question I would recommend loa construction and roofing."

— Tony Smith, 5-Star Google Review

From the very start, I knew I was in good hands. The professionalism was top-notch, but most important, was the caring attitude of the project manager, Dan Harvey, the roofing supervisor, Ambrocio, and the roofing crew. They made sure every detail was covered. They are definitely an asset to LOA Construction. I highly recommend them. Dennis and Suzy S

— Dennis Sanger

Andrew was very great at getting myself and my wife all the information and getting us started from start to completion. His workers were friendly and professional. If ever I had to contact him, he was quick to respond back. We are very happy with the finished product. Yes, I would and have recommended him and his company to get their work by LOA Construction and Austin. Andrew made sure my wife would be satisfied with whatever roof she liked. Can't thank you enough Andrew and LOA Construction.

— Paul Coleman

As a first time home owner with no experience in how to make claims and start the process of getting a new roof I was scared to the point of avoiding what needed to get done after the bad hail storm. August Walker did an amazing job walking me through each step along the way. He answered all my questions and calmed my concerns. They inspected my roof and drove from Austin to Belton just to be there with the ins inspector, and followed up with me in person after the roof was installed. He also made a special trip back to drop off samples! I'm grateful to August and LOA construction for being highly professional and friendly!

— Angela Baker

From start to finish Lee and his team took great care of us. He made us feel comfortable during the process and answered any and all questions we had. I would definitely them recommend to anyone.

— Taneisha Jones

Arthur Harris and his team with LOA Construction did an excellent job on our roof. They finished it in one day. Arthur was very good in explaining all the information to us.

— Crystal Hill

Will, has been so awesome and easy to work with he gets everything we want done the way we want it and also keeps us updated as we are over the road truck drivers !!! Hands down to LOA Construction for their great service and great customer service !!!

— Tanya Dudkiewicz

Dan Harvey is Very Knowledgeable and directed me straight to the products that will save us money in the next 3 years the savings on energy costs alone will pay for the installation itself. I highly recommend LOA Construction and Dan Harvey! Actual Customer Jefferson Fara

— Jefferson Fara

Mark from LOA roofing was very professional from the git, the initial estimate process, he quickly identified all the issues that needed to be addressed. The company was very prompt, to coordinate the crew, and for a very reasonable price, got my roof repaired without any hassle. They also took care of all the cleaning, so that it all looked like nothing happened. I would recommend Mark from LOA to anyone needing a roof repair, with no kind of hesitation.

— Ale León

Loa Construction provides quality services in installing roof and related repairs. I'll recommend it to my friends and family.

— Peijie Li

Thanks to Landon Wells of LOA Construction for the beautiful new roof! It was all completed in one day including a meticulous clean up job afterwards. The workers were all polite and professional. Landon made sure everything went smoothly and that all of our questions were answered. I am thrilled with our new roof. I would definitely recommend Landon and LOA Construction to all of my friends and family. Thank you Landon!

— Renee Johnson

Choose an Austin Roofing Company that can help you make a lasting investment in your house or business.

Schedule a FREE Inspection

Dedicated to excellence, our Austin roofing company ensures quality in every project. Contact our skilled Central Texas roofers for a same-day, hassle-free inspection. Call +1 (512) 375-3654 to book your free inspection.

Common Roofing Problems: Leaks Around Skylights