Replacing skylights during a roof replacement is a common homeowner decision that can impact energy efficiency, water protection, and overall roof longevity. This guide examines when it makes sense to replace skylights as part of reroofing, what to consider, and practical steps to ensure a durable, watertight result. readers will learn how to weigh costs, select the right skylight type, and work with qualified contractors to achieve a long-lasting installation.
Benefits of Replacing Skylights During Reroofing
Combining skylight replacement with reroofing offers several advantages. A new roof and new skylights share a single installation window, reducing labor duplication and potential punch list items after the roof is complete. Modern skylights typically feature improved energy efficiency, better UV protection, and enhanced insulation, which can lower heating and cooling costs over time. Additionally, a roof replacement is an opportune moment to address structural issues around obstructions, flashing details, and venting that affect skylight performance.
- Improved waterproofing — New flashing and roof deck integration reduce the risk of leaks around the skylight.
- Better energy efficiency — Modern skylights offer low-E coatings, double or triple glazing, and improved glazing-to-frame seals.
- Aesthetic alignment — A new skylight style can better match the roof profile and interior lighting goals.
When to Replace vs Repair
Deciding between repair and replacement hinges on skylight condition, age, and the roof’s overall health. If a skylight has extensive flashing damage, warping, persistent leaks, or the curb is rotted, replacement is usually prudent. If the skylight frame and glass are in good condition, and the leaks originate from the roof deck or flashing rather than the skylight itself, a targeted repair might suffice. Consider the following criteria:
- Age — Skylights with seals aged beyond 15–20 years often justify replacement.
- Leak history — Recurrent leaks after optimal flashing adjustments suggest replacement.
- Energy performance — Older skylights may create drafts and heat loss that a modern unit can cure.
- Roof deck condition — If the deck under the skylight is compromised, replacement is more cost-effective than patching.
Types of Skylights to Consider
Choosing the right skylight shapes and glazing affects performance and price. The most common options include:
- Fixed skylights — Simple, energy-efficient, often the most affordable; no opening mechanism.
- Vented skylights — Provide natural ventilation; include manual or electric opening.
- Pitched vs. curb-mounted — Curb-mounted skylights sit on a framed curb above the roof, improving waterproofing; pitched skylights follow roof angle.
- Skylight materials — Glass offers durability and clarity; acrylic or polycarbonate is lighter and may be less expensive.
- Energy efficiency features — Low-E coatings, double or triple glazing, tempered glass, and argon-filled cavities boost performance.
Cost and Timeline Considerations
Costs vary based on skylight type, size, roofing material, and labor rates. When planning reroofing, homeowners should budget for both the roof replacement and skylight installation. Below is a typical range to guide decisions, noting that regional differences and roof complexity influence final pricing:
| Item | Estimated Cost Range (Residential) |
|---|---|
| Basic fixed skylight | $500–$1,500 per unit |
| Ventilated skylight (manual) | $1,000–$2,500 per unit |
| Ventilated skylight (electric) | $1,800–$4,000 per unit |
| Labor for skylight install with reroof | $1,000–$3,000 per unit |
| Reroofing (materials only, asphalt shingles) | $5,000–$12,000+ per roof |
Timeline depends on roof size, weather, and accessibility. Planning for a multi-day project is prudent, and scheduling skylight installation to sync with roof deck sealing and flashing work minimizes leaks and backtracking.
Choosing the Right Contractor and Installation Tips
Selecting a skilled contractor is critical for a leak-free outcome. Prospective homeowners should seek contractors with proven skylight and roof replacement experience. Key steps include:
- Experience and references — Look for installers who regularly complete both reroofing and skylight projects.
- Written scope and warranty — Ensure details cover flashing, underlayment, curb construction, insulation, and system warranties.
- Inspection of surrounding systems — Verify attic ventilation, insulation levels, and attic access for a smooth installation.
- Weather considerations — Schedule during dry, mild weather to prevent moisture intrusion.
- Flashing details — Require continuous flashing along with proper integration to the roof plane and skylight curb.
Installation tips:
- Prefer curb-mounted skylights on pitched roofs to ensure proper water shedding and flashing compatibility.
- Ask for a detailed installation diagram showing flashing, underlayment, and how the skylight interfaces with the new roof deck.
- Request energy performance data, such as U-value and Solar Heat Gain Coefficient (SHGC), to compare efficiency.
- Ensure interior trim and insulation around the skylight are sealed to prevent convective air leakage.
Common Pitfalls and Maintenance After Replacement
Being aware of common mistakes helps ensure longevity and performance. Typical pitfalls include inadequate flashing around skylights, mismatched roof materials, and insufficient attic ventilation. Maintenance after installation focuses on keeping seals intact and monitoring for condensation or glazing wear. Regular inspections—especially after heavy storms—can catch issues early. Consider these maintenance actions:
- Inspect flashing and seals at least once a year and after major weather events.
- Keep around-the-skylight vegetation trimmed to prevent moisture retention.
- Clean skylight glass to maintain clear light transmission and inspect for microcracks or fogging.
- Check interior skylight trims for gaps that could transfer drafts into living spaces.