Skylight Installation and Roof Integration: What North Windham Homeowners Need to Know

A skylight is a hole in your roof — and in North Windham, where fall rain gives way quickly to freeze-thaw cycles and heavy wet snow, that hole has to be sealed perfectly or it will leak. Most skylight failures are not product defects. They are flashing failures caused by poor integration between the skylight unit and the surrounding roof materials.

Why Skylight Leaks Are Almost Always a Flashing Problem

Nearly every skylight leak traces back to flashing, not the glass or dome itself. Flashing is the system of metal pieces that bridge the gap between the skylight frame and the roof deck, directing water away from that opening.

A skylight installation involves four specific flashing components. Sill flashing goes in first at the base. Step flashing runs up both sides, with individual metal pieces woven between each shingle course — this is the most failure-prone area on any installation. A cricket, or saddle, is a small peaked diverter installed on the upslope side of the unit to redirect water and debris around the skylight instead of letting it dam behind it. Head flashing closes the top and overlaps everything below.

The cricket is the piece most often skipped on budget jobs. Any skylight wider than 30 inches needs one per industry standard. Without it, ice and debris build up behind the unit, and water eventually forces its way under the head flashing. If you see water staining above your skylight on the interior ceiling, a missing cricket is the likely cause.

Deck-Mounted vs. Curb-Mounted: How the Type Changes the Integration

The mounting style determines exactly how the flashing must be installed, and mixing up the approach leads to gaps. Deck-mounted skylights sit directly on the roof deck with a built-in flashing kit; they rely on shingles being woven precisely around the unit. Curb-mounted skylights sit on a raised wooden frame that gets flashed independently, making the unit easier to service but requiring the curb itself to be sealed correctly.

Deck-mounted units are more common on standard-pitched roofs but are more vulnerable when shingles are not correctly integrated with the flashing kit. Curb-mounted units are better suited to lower-slope roofs. Either way, if the flashing sequence is not followed in the right order, water finds the gap — often within the first winter.

For help evaluating your full GAF-certified roofing contractor options and understanding how certification affects installation standards, that credential matters specifically because it governs how penetration flashing around skylights must be handled to keep manufacturer warranties intact.

How Do You Know If You Need Re-Flashing, a New Skylight, or Both?

Re-flashing alone may be enough if the skylight glazing is intact, the unit is under 15–20 years old, and the leak visibly traces to a flashing gap rather than unit failure. You can often spot this: water staining beside the skylight rather than directly below it usually points to step flashing gaps, not glass failure.

Full replacement — unit and flashing together — is the right call when the glazing is fogged or cracked, condensation appears between panes, the curb is rotted, or the skylight is original to a roof that is itself being replaced. This last point is critical: never re-roof around an old skylight. Installing new shingles without evaluating and replacing the skylight means the flashing integration is compromised from day one.

Old flashing left under a new skylight is one of the most common causes of chronic leaks that a new unit alone cannot fix. A thorough inspection should always include fully removing the original flashing before any new material goes down.

Why Fall Is the Right Time to Address This in North Windham

Acting before Connecticut winter arrives protects both a new installation and an existing one. Connecticut winters are the right stress test for any flashing failure — freeze-thaw cycling forces water into any gap and expands it, a slow drip in October becomes active water intrusion by January.

Skylights interrupt the thermal plane of the roof, meaning heat escapes around the rough opening and contributes to localized ice dam formation right at the skylight perimeter. Proper insulation of the interior light well shaft reduces this risk, but it only helps if the flashing is already sound. Making sure your snow removal plan accounts for ice loading near skylight perimeters is one more layer of protection through the North Windham winter.

GAF-certified contractors in the area book up in fall. Homeowners who wait until a leak is active in January face limited scheduling and higher emergency pricing.

The Case for One Contractor Handling Both the Skylight and the Roof

When a skylight company and a roofing crew work separately, accountability splits. If a leak appears, the roofer says the skylight unit failed; the skylight company says the roofer flashed it wrong. Neither warranty covers the gap between them.

Proper integration requires the skylight installer and roofer to coordinate shingle courses, flashing layers, and deck preparation in a specific sequence. When those are two different crews on two different schedules, steps get skipped or done out of order. Velux and Fakro — the two dominant skylight brands — both require their flashing kits to be installed per a published sequence to keep the product warranty valid. A contractor who owns both trades can satisfy both requirements at once.

The same principle applies more broadly: matched products and coordinated installation protect the whole system. You see this logic in how windows and siding products work best when the materials and installation are handled together rather than piecemeal.

Questions to Ask Before You Hire Anyone

A few direct questions will tell you quickly whether a contractor is qualified to do this work correctly.

• Do you handle both the skylight installation and the flashing/roofing work, or do you subcontract one?
• Will you use the manufacturer flashing kit or fabricate custom flashing — and why?
• Is a cricket included for a skylight this size, or is it treated as optional?
• Will the old flashing be fully removed before the new installation, or will new material go over it?
• What warranty do you provide on the flashing work specifically, separate from the product warranty?
• What is your process if a leak appears within the first year?

A contractor who hesitates on the cricket question or who plans to install over existing flashing is telling you something important before any work begins.

Getting the flashing right the first time protects the roof deck, the framing around the rough opening, and the interior finish below — failures in any of those areas compound into repairs far more expensive than the original skylight installation.

Schedule your skylight inspection this fall before the first hard freeze, and make sure the contractor you choose owns both the skylight and the roofing work from start to finish. Contact Swift Water Gutter and Roofing to plan your skylight integration project before North Windham winter weather closes the scheduling window.