Skylight leaking after a new roof can be frustrating and costly. This article explains the most common reasons a skylight leaks following roof replacement and provides practical inspection steps, repair options, cost expectations, warranty considerations, and prevention tips. Readers will learn how to determine responsibility and when to hire a professional.
| Problem | Likely Cause | Typical Fix |
|---|---|---|
| Leak At Skylight Frame | Improper flashing or sealant failure | Re-flashing or resealing |
| Leak Between Roof And Skylight | Incorrect shingle placement or underlayment gaps | Shingle repositioning, underlayment repair |
| Interior Condensation | Poor ventilation or thermal bridge | Improve ventilation, install thermal breaks |
Why Skylights Leak After A New Roof
Skylights may leak after roof replacement for several reasons, including improper flashing installation, damaged or misaligned shingles, or disturbed underlayment. Even competent roof replacements can expose pre-existing skylight issues. Understanding the root cause helps determine whether the roofer, the skylight manufacturer, or another contractor should address repairs.
Initial Inspection Steps Homeowners Can Take
Perform a basic inspection immediately after detecting a leak to gather facts before contacting contractors. Document damage with photos and notes on weather conditions and when the leak occurs. This information is valuable for warranty claims and contractor assessments.
- Inspect the attic or ceiling around the skylight for stains, drips, and wet insulation.
- From outside, look for visible gaps in flashing, lifted shingles, or sealant cracks around the skylight perimeter.
- Check interior trim and glazing for cracks or failed seals.
Common Leak Locations And What They Indicate
Identifying the leak location narrows down likely causes. Different leak patterns point to flashing, roofing, glazing, or condensation problems.
Flashing Interface
Leaks that track down the skylight frame usually indicate faulty or improperly installed flashing. New roofing can disturb existing flashings or reveal flashing that was already failing.
Shingle And Underlayment Junction
If water appears under shingles near the skylight, the issue may be shingle misplacement or damaged underlayment installed during the re-roof. Improper lap sequencing allows water to bypass shingles.
Skylight Unit Or Glazing Seal
Leaks originating from the center of the skylight or between panes often signal seal failure or a cracked dome. New roofing work does not cause glazing failure, but it can reveal it by removing protective layers.
Condensation Vs. Leak
Condensation can mimic leaks. If moisture forms only during temperature swings or high humidity, evaluate ventilation and insulation before assuming roof work caused penetration. Condensation requires building-envelope fixes, not roofing repairs.
How Roofers Should Install Skylight Flashing
Correct flashing is essential to prevent leaks. A proper installation uses step flashing, counterflashing, and a continuous underlayment transition. Flashing must integrate with the roof’s starter, underlayment, and shingle pattern.
- Underlayment should extend up and under the skylight flange.
- Step flashing should be interwoven with shingles on the sides.
- Head flashing or counterflashing should protect the top edge and divert water over the shingles.
DIY Repair Options For Common Problems
Minor issues may be addressed by confident homeowners, but safety and roofing experience are essential. Temporary fixes can stop damage until a permanent repair is scheduled.
- Reseal Exterior Seams: Use a high-quality, UV-resistant roofing sealant around the skylight flange for small gaps. Clean surfaces first.
- Replace Damaged Shingles: Reposition or replace misaligned shingles that direct water under the flashing.
- Interior Patch: For cosmetic ceiling damage, dry and patch drywall after eliminating the leak source.
Professional Repair Methods
Complex leaks or flashing replacements require professional work to ensure lasting results. Licensed roofers or skylight specialists follow best practices and local building codes.
- Full Re-flashing: Remove the skylight flange flashing and install new step and counterflashing integrated with new underlayment and shingles.
- Skylight Replacement: If the unit’s glazing or frame is compromised, replacing the skylight may be more cost-effective than repeated repairs.
- Underlayment Repair: Replace torn or poorly lapped underlayment around the skylight during a re-roof.
Warranty, Responsibility, And Claim Tips
Determining responsibility involves reviewing the roofing contractor’s workmanship warranty, the skylight manufacturer warranty, and roofing material warranties. Proper documentation and prompt communication increase chances of covered repairs.
- Check The Roofer’s Warranty: Most roofers warranty their workmanship; flashing errors after a new roof often fall under this warranty.
- Manufacturer Warranty: If glazing or frame defects cause the leak, the skylight maker’s warranty may apply.
- Document Everything: Keep photos, receipts, and written communication. Request a written inspection from the roofer.
When To Hire A Professional Immediately
Hire a qualified contractor when leaks persist, water stains expand, mold appears, or structural elements are wet. Quick professional intervention reduces long-term damage and mold risk.
- Persistent Leaks After Temporary Fixes
- Water Saturation In Structural Elements
- Signs Of Mold Or Mildew
- Multiple Leak Points Or Complex Flashing Work
Cost Estimates And Factors That Affect Pricing
Repair costs vary widely based on the cause and scope. Typical ranges help set expectations. Costs increase if the skylight requires replacement or extensive roof repairs are needed.
| Repair Type | Typical Cost Range (USD) |
|---|---|
| Reseal Or Minor Flashing Repair | $100 – $400 |
| Partial Re-flashing | $300 – $900 |
| Full Re-flashing Or Skylight Replacement | $600 – $2,500+ |
| Extensive Roof Repair Around Skylight | $1,000 – $5,000+ |
Preventive Measures After A New Roof
Prevention extends the life of both the roof and skylight. Simple steps reduce future leaks and protect warranties. Inspect and maintain skylights annually and after severe storms.
- Schedule a Post-Roof Inspection: Request the roofer to inspect skylight flashing immediately after completion.
- Maintain Sealant: Replace aged sealant and inspect flashing seams regularly.
- Improve Ventilation: Reduce condensation risk by improving attic ventilation and insulation around the skylight.
- Trim Nearby Branches: Prevent impact damage and reduce debris buildup around the skylight.
Frequently Asked Questions
Is A Skylight Leak Covered By A New Roof Warranty?
Coverage depends on the warranty terms. Workmanship warranties typically cover flashing errors from roof replacement, while manufacturer warranties cover defects in the skylight unit. Homeowners should review contracts and request on-site inspections.
Can Resealing Stop All Skylight Leaks?
Resealing can fix small gaps but will not address structural flashing failures or degraded underlayment. A professional diagnosis ensures the correct repair method.
How Long After A New Roof Should A Leak Appear If Caused By Installation?
Installation-caused leaks often appear during the first heavy rain after roofing or within the first year. Promptly report new leaks to the roofing contractor for faster resolution.
Resources And Next Steps
Homeowners should collect photos, keep warranty documents, and request a written report from any contractor who inspects the leak. Obtaining two or three estimates helps compare solutions and confirms the best course of action.