Skylight Repair: Fixing Leaks and Maintaining Your Skylights

Skylights bring natural light into homes but are also common leak sources. Understanding skylight problems and repair options helps you maintain these valuable features.

Understanding Skylight Systems

Skylights integrate with roofing in complex ways.

Skylight Components:: - Frame (typically aluminum) - Glazing (glass or plastic) - Gaskets and seals - Flashing kit (factory or site-built) - Curb (elevates skylight above roof) - Interior trim

Skylight Types:

How Skylights Leak:: Water entry points: 1. Flashing failure at roof integration 2. Seal deterioration around frame 3. Condensation from temperature differences 4. Cracked or failed glazing 5. Frame corrosion or damage

Diagnosing Skylight Problems

Accurate diagnosis guides proper repair.

Is It Really a Leak? Condensation is often mistaken for leaking:

Signs of condensation: - Water only appears in humid conditions - Moisture on inside of glass - Water on interior surfaces, not coming through - Occurs with temperature differences

Signs of actual leak: - Water during or after rain only - Water on frame exterior - Staining on drywall around skylight - Drips from same location

Leak Source Identification:: During rain, carefully observe: - Where does water first appear? - Does it follow a path before dripping? - Is water entering at edge or center? - Does wind direction affect appearance?

Flashing Inspection:: Check exterior flashing: - Visible gaps or separation - Rust or corrosion on metal - Missing sealant - Shingles lifted around skylight - Debris accumulation

Common Skylight Repairs

Many skylight problems are repairable.

Seal Replacement:: For deteriorated perimeter seals:

Process: 1. Remove old sealant completely 2. Clean surfaces thoroughly 3. Apply primer if specified 4. Install backer rod if gaps are deep 5. Apply appropriate sealant 6. Tool smooth for water shedding

Sealant selection: - Silicone for most applications - Polyurethane for movement areas - Avoid latex/acrylic outdoors

Gasket Replacement:: Many skylights have replaceable gaskets: 1. Identify gasket type and source 2. Remove old gasket carefully 3. Clean gasket channel 4. Install new gasket 5. Verify proper seating

Gasket sources: - Skylight manufacturer - Specialty weatherstripping suppliers - Home improvement stores (standard sizes)

Flashing Repair:: For minor flashing issues: 1. Clean area thoroughly 2. Apply roofing cement to gaps 3. Press flashing into cement 4. Apply additional cement over edges 5. Maintain water-shedding contours

Weep Hole Clearing:: Skylights have weep holes for condensation drainage: 1. Locate weep holes (usually bottom of frame) 2. Clear any blockages with thin wire 3. Verify water can exit 4. Clean debris from around openings

Professional Skylight Repairs

Some repairs require professional expertise.

When Professionals Are Needed:: - Complete flashing replacement - Shingle integration work - Glazing replacement - Curb reconstruction - Significant roof work required

Professional Repair Costs:

Flashing Replacement:: When flashing fails completely: 1. Remove shingles around skylight 2. Remove old flashing 3. Install new step and counter flashing 4. Integrate with ice and water shield 5. Reinstall shingles properly 6. Seal all critical points

Condensation Solutions

If condensation is the issue, different approaches apply.

Reducing Condensation:: - Improve ventilation in room below - Reduce indoor humidity levels - Upgrade to insulated glazing - Consider condensation channels

Ventilation Improvements:: - Install bathroom fans if applicable - Use dehumidifier in problem areas - Improve HVAC circulation - Consider vented skylight replacement

When Condensation Indicates Problems:: Excessive condensation may indicate: - Failed insulated glazing - Poor attic ventilation - Inadequate skylight insulation - HVAC imbalance issues

Skylight Maintenance

Regular maintenance prevents most problems.

Maintenance Schedule:

Cleaning Tips:: - Use mild soap and water - Avoid abrasive cleaners on plastic - Clean exterior when safely accessible - Check for damage while cleaning - Don't pressure wash directly

Seasonal Care:: - Spring: Check for winter damage - Summer: Clean and inspect - Fall: Clear debris before winter - Winter: Monitor for ice dam effects

When to Replace vs. Repair

Skylights have finite lifespans.

Replace When:: - Frame is corroded or warped - Glazing is cracked or failed - Flashing problems are chronic - Seal failure is widespread - Energy efficiency is poor - Skylight is 20+ years old

Repair When:: - Problem is localized - Skylight is relatively new - Component replacement is possible - Flashing can be repaired - Frame is sound

Upgrade Considerations:: When replacing, consider: - Better glazing (low-E, insulated) - Improved flashing systems - Vented options for ventilation - Solar-powered operation - Larger or different configuration

Skylight Installation Issues

Sometimes problems stem from original installation.

Common Installation Deficiencies:: - Inadequate curb height - Improper flashing integration - Missing ice and water shield - Sealant instead of proper flashing - Shingles not properly integrated

Correcting Installation Problems:: Often requires: - Complete reflashing - Curb reconstruction - Proper underlayment installation - Sometimes skylight replacement

Safety Considerations

Skylight work involves specific risks.

Working Around Skylights:: - Never step on skylight glazing - Use proper roof safety equipment - Be cautious near edges - Consider working from inside when possible

Professional Access:: For difficult or dangerous access: - Hire professionals with proper equipment - Consider boom lift for high skylights - Don't take unnecessary risks

Multiple Skylights

Homes with multiple skylights need coordinated approach.

Common Issues:: - If one leaks, others may be aging similarly - Repair techniques should be consistent - Consider addressing all simultaneously - Group replacement may be economical

Evaluation Approach:: 1. Assess each skylight individually 2. Note age and condition 3. Identify common problems 4. Plan coordinated repairs or replacement 5. Consider budget for comprehensive solution

Working with Contractors

Skylight work requires specific expertise.

Finding Qualified Help:: - Roofing contractors with skylight experience - Skylight installation specialists - Manufacturer-certified installers

Questions to Ask:: - Have you repaired this brand/type before? - What warranty do you provide? - Will you address both flashing and seals? - What if the repair doesn't work?

Red Flags:: - Recommending replacement for minor issues - Not examining flashing system - Quick fixes without proper diagnosis - No written warranty

Find contractors experienced in skylight repair and installation.

Conclusion

Skylights require attention to maintain their benefits without water problems. Accurate diagnosis distinguishes leaks from condensation and identifies the actual failure point. Many repairs are straightforward, but complex flashing or replacement work requires professional expertise. Regular maintenance prevents most problems and extends skylight life.

Need professional skylight repair? Connect with qualified roofing contractors who specialize in skylight work.