Sealant reapplication
If the flashing is sound but the sealant has cracked or failed, resealing the flashing around the skylight curb is the fix. This is the least expensive repair and works when the flashing itself is not damaged.
Expert repair of leaking skylights, including flashing, sealant, and replacement if needed.
Fastest: call (833) 751-2102. Or send this and we call you back.
Gloucester Roofing connects you with roofers who specialize in skylight leak repair. A skylight is a roof penetration with flashing and multiple seals that can fail. Repair usually involves resealing or replacing the flashing; replacement of the skylight itself is sometimes needed. Call (833) 751-2102.
A skylight is a large opening in the roof for light and ventilation. That opening has to be sealed with flashing and sealant to keep water out. When the sealant dries or the flashing fails, water comes in through the skylight faster than through shingles.
Skylight leaks are common because the flashing and sealant are under constant stress from heat, cold, wind, and water. The skylight curb, which is the frame holding the window, also moves with the roof structure, stressing the seals.
On the Middle Peninsula, wind-driven rain and salt spray accelerate the failure of skylight seals. A skylight that is leaking is not a minor issue; interior water damage spreads fast from the ceiling below.
Do not climb onto a roof to inspect or repair a skylight. A roofer with proper equipment and fall protection should handle it.
Skylight leak repair ranges from a few hundred dollars for resealing to $1,000-2,000+ for flashing replacement or skylight replacement.
| Job | Typical range | What it includes |
|---|---|---|
| Sealant reapplication around existing flashing | $200-500 | If the flashing is sound, resealing is the cheapest fix |
| Flashing replacement | $500-1,500 | Removing and installing new flashing; some shingle removal needed |
| Skylight window replacement | $1,000-3,000+ | New window and flashing; more involved and expensive |
| Interior damage repair from prolonged leak | Can be significant | Drywall, insulation, and structural repair costs add up if water has been coming in |
The longer a skylight leaks, the more interior damage costs. Address leaks quickly.
If the flashing is sound but the sealant has cracked or failed, resealing the flashing around the skylight curb is the fix. This is the least expensive repair and works when the flashing itself is not damaged.
If the metal flashing is bent, rusted, or separating, it is replaced with new flashing. This is more involved than resealing but results in a longer-lasting repair.
If the skylight window itself has failed seals (fogging, condensation) or the glass is cracked, the entire skylight is replaced. This is the most expensive option but results in a new window and flashing.
Most skylight leak repair calls are scheduled the same day when a technician is free, and you approve the price before any work starts.
Many skylight leaks can be repaired by resealing the flashing. If the flashing itself is damaged, replacing the flashing fixes the leak without replacing the entire window. Full skylight replacement is needed only if the window is old, the frame is failing, or previous repairs have not worked.
Resealing is usually the first attempt and costs the least. If that does not stop the leak, flashing replacement is the next step.
Ask the roofer whether they think resealing will hold or whether they recommend replacing the flashing.
If the skylight has been leaking for a long time, the interior damage may determine whether repair or replacement is more economical. A roofer can assess the interior water damage and advise accordingly.
5-10 years in most climates, 3-7 years in a coastal climate where UV exposure and salt air accelerate deterioration. A skylight that is in the sun all day will need resealing sooner than one in shade.
Plan for periodic resealing as part of roof maintenance. Catching a failing seal early prevents water damage.
High-quality sealant lasts longer than budget sealant. Ask the roofer what type they recommend.
On the Middle Peninsula, where skylights get full sun exposure and salt air, the 3-7 year window is more realistic than the 5-10 year inland estimate. Budget for regular maintenance.
Installation problems. The flashing may be installed incorrectly, the sealant may be applied wrong, or the skylight may have been installed without proper underlayment. A roofer should inspect and correct the installation.
Do not accept a leaking skylight as normal. The installer should stand behind the installation and fix it.
Ask the installer whether they warrant the skylight against leaks, and if not, hire another roofer to assess and fix.
No. A skylight is designed to handle normal rain and wind. Covering it is not necessary and blocks light. If a skylight is prone to leaks, the problem is the seal or flashing, not the window itself. Fix the leak rather than covering the skylight.
A skylight in good condition does not leak during storms. If it does, something is wrong with the installation or the window itself.
The roofer inspects the skylight from the outside to see condition of flashing and sealant, and from the inside to identify where water is entering. Flashing and sealant often both need attention.
If the sealant is cracked or the flashing is bent or rusted, repair is possible. If the skylight is old and the seal is failing repeatedly, replacement may be more cost-effective.
Removal of old sealant and application of new high-quality sealant around the skylight curb. If flashing is damaged, it is replaced. Both steps are necessary for a permanent fix.
If the skylight window has failed seals (interior condensation, fogging), the window may need replacement. A leaking skylight and a failed window should both be addressed.
The roofer tests the repair by spraying water around the skylight or waiting for rain to confirm the leak is stopped.
Skylights on Middle Peninsula homes get intense sun exposure, which accelerates sealant degradation. Coastal UV and salt air make resealing more frequent than inland. Plan for periodic maintenance.
Wind-driven rain during nor'easters and tropical storms tests skylight seals. Leaks often appear after a significant storm, when seals that were barely holding fail under water pressure.
In winter, if warm interior air is escaping through a failed skylight seal, you may see condensation or frost accumulating. This indicates a seal failure and indoor air is being lost.
Not sure if you're covered? Check your ZIP code.
Spot repairs to valleys, flashing, shingles and dormer joints, arranged through one call to Gloucester Roofing and carried out by a local technician.
Expert flashing repair at valleys, chimneys, vents and walls where roof components meet and water enters.
Immediate roof leak repair and tarping service to stop water damage in your home, available day and night.
Expert roof inspections for sale readiness, storm damage assessment, and insurance coverage evaluation.
Temporary, maybe. But a proper repair requires identifying the exact source of the leak and using the right sealant. Hire a roofer for a permanent fix.
Polyurethane or silicone caulk rated for exterior use. The roofer should specify the product and apply it properly. Cheap caulk will fail in a few years.
Some condensation is normal. But excessive condensation or fogging indicates the window seal has failed. This is separate from the roof flashing leak but should be addressed.
The window frame and glass last 20-30 years or longer. The sealant around the frame lasts 5-10 years. The flashing lasts 15-25 years. All three components need attention at different intervals.
This is an active leak. Call a roofer immediately. Water damage is accumulating in the insulation and framing around the skylight. The longer you wait, the more damage occurs.
Regular inspection and resealing every 5-7 years helps. Keeping debris off the roof near the skylight prevents clogging and water pooling. But eventually, aging sealant will need replacement.