Skylight Repair
Skylight Repair
Finding where the leak actually starts.
Commercial skylight repair in Winchester, KY deals with one of the most predictable leak points on a low-slope roof — the curb where the skylight unit meets the membrane, which takes more thermal movement and weathering than almost any other roof detail.
Where Do Commercial Skylights Actually Leak?
Almost always the curb flashing or glazing seal, not the glass itself — which is why most leaks are a flashing repair, not a replacement.
A skylight curb sees more expansion and contraction than the flat field of the roof, because it’s a raised box exposed on four sides. Sealant at the glazing joint dries out and cracks first, followed by flashing that’s pulled loose or corroded at the fasteners. True glass or dome failure is comparatively rare.
What We Check
- Curb flashing condition and fastener corrosion on all four sides
- Glazing seal and gasket condition around the skylight perimeter
- Membrane termination where it ties into the curb base
- Ponding water or debris buildup against the curb’s low side
- Interior signs — staining, condensation trails on the frame
Repair vs. Full Unit Replacement
Most leaks are solved by reflashing the curb and resealing the glazing, not replacing the skylight itself. Full unit replacement generally comes up when the frame has corroded through, the glazing has delaminated, or the unit predates current insulation and energy code standards. The National Roofing Contractors Association publishes technical guidance on curb flashing details relevant to skylight and other roof penetrations.
Typical Cost
Reflashing and resealing a single commercial skylight curb typically runs $300–$900 depending on access and curb size. Full skylight unit replacement runs $1,500–$4,000+ per unit depending on size and glazing type. These are typical Winchester-area ranges, not a quote for your building — see our commercial roofing cost guide for other repair types.
Common questions
Is a leaking skylight always a full replacement?
No — most skylight leaks trace back to curb flashing or the glazing seal, both repairable without replacing the unit itself.
Can this wait until my next scheduled roof inspection?
A slow leak can, but water tracking down through insulation causes damage well before it shows up as an obvious drip, so we’d rather look sooner.
Do you work on all skylight types?
Yes — curb-mounted, flush-mounted, and dome-style units on commercial low-slope roofs.
Related: roof leak detection · curb & penetration flashing · repair vs. replace. Back to Winchester Commercial Roofing.
Winchester Commercial Roofing · Serving Winchester, Mount Sterling, Paris, Lexington & Clark County, KY · Call or text (859) 310-1209
Last updated September 3, 2026