Why Is My Skylight Leaking Only During Storms?
Last updated October 25, 2026
The short answer
Common Causes of Storm-Only Leaks
Your skylight is designed to handle rain, so a leak only during storms points to a specific failure. The sealant around the glass or frame can degrade over time, creating tiny gaps. High winds during a storm can drive water sideways into these openings. Debris like leaves or pine needles can also block drainage channels, causing water to back up and enter when rainfall is heavy.
Flashing, the metal strips that seal the skylight to your roof, is another weak spot. If it's corroded, loose, or improperly installed, it won't create a watertight seal. The intense wind and rain pressure of a storm can push water underneath compromised flashing. This problem often goes unnoticed until a significant weather event tests its limits.
The Role of Wind and Pressure
Storm conditions create forces that normal rain does not. Strong winds can push water upward against gravity, forcing it under shingles and into gaps around the skylight. This is known as wind-driven rain, and it exploits any vulnerability in your roof's defense system. The pressure difference between the inside and outside of your home during a storm can also suck moisture inside through small openings.
If you live in Katy, its humid subtropical climate with hot humid summers and a Gulf hurricane season means your home faces these intense conditions regularly. The cyclical expansion and contraction of materials from heat and moisture can worsen small cracks over time. A leak that appears only during the worst weather is a clear sign that your skylight's defenses are failing under pressure.
- Wind drives rain sideways and upward into gaps.
- Low atmospheric pressure can pull moisture indoors.
- Debris blocks drainage, causing water to pool and seep.
- Damaged or shrunken seals open under stress.
- Loose flashing allows water to be forced underneath.
- Condensation can worsen with rapid temperature drops during storms.
Immediate Steps to Minimize Damage
When you notice a leak, your first move is to protect your home's interior. Place buckets or containers under the drip to catch water. Move any furniture, rugs, or electronics away from the affected area immediately. If it's safe to do so, you can try to gently clear any visible debris from the skylight well or the roof area around it from inside your attic.
Use towels to soak up standing water on floors or sills. Increase air circulation in the room by turning on fans, but avoid using electrical appliances if water is near outlets. Document the leak with photos or video, noting the time and weather conditions. This information can be helpful for a roofer or your insurance company. Policies vary, and your insurer decides what is covered.
When to Call a Professional Roofer
Diagnosing and repairing a skylight leak often requires a professional roofer. They have the expertise to safely inspect the flashing, seals, and integration with your roof deck. A temporary patch might stop water for now, but a roofer can identify the root cause and provide a lasting solution. They can also check for related issues like rot in the roof sheathing or framing that you cannot see.
Addressing Interior Water Damage
Water that enters your home needs proper drying to prevent secondary damage. Moisture in drywall, insulation, and ceiling materials can lead to mold growth within 24 to 48 hours. If the leak has soaked into walls or ceilings, local water damage pros can use professional-grade equipment to dry the structure thoroughly. They assess moisture levels in materials you cannot see to ensure a complete dry-out.
Ignoring wet building materials compromises your home's structure and air quality. The pros can also handle necessary repairs, like removing and replacing damaged drywall or insulation. If you suspect mold growth from a persistent leak, it's wise to consult a mold assessment professional. For any health symptoms like increased allergies, see a doctor to discuss your concerns.
- Wet drywall and insulation must be dried quickly to prevent mold.
- Professional drying equipment extracts moisture from deep within materials.
- Stagnant water can damage structural wood and framing.
- Musty odors often indicate hidden moisture or early mold.
- Ceiling stains may need professional repair after the leak is fixed.
- Always ensure the area is completely dry before any repainting.
Talk to someone now
Phones are answered 24/7 for Katy and nearby communities.
Call Now (832) 979-5241Frequently asked questions
Can I just caulk around the skylight to stop the leak?
Applying caulk from the inside is usually a temporary fix. The primary leak is often on the roof exterior at the flashing. Exterior caulking on roofing materials also fails over time. A roofer should identify and fix the actual source for a permanent solution.
Could the leak be condensation and not rainwater?
Yes, condensation is possible, especially if the leak appears as fog or drips on clear, cold days. However, a leak that only happens during storms strongly suggests wind-driven rain is the cause. A professional inspection can determine the exact source of the moisture.
Will my homeowner's insurance cover skylight leak repairs?
Coverage depends on the cause. Sudden damage from a storm may be covered, but wear and tear or lack of maintenance often is not. You should report the damage to your insurer and get an inspection. Policies vary, and your insurer decides what is covered.