Skylight Leaks: Flashing, Units, and Condensation

We start indoors: stain location, seasonality, and whether moisture appears on glass versus drywall edges. Attic review checks for daylight at curbs, wet insulation pockets, and exhaust air hitting the skylight well.

On the roof we inspect step flashing integration, headwall seals, and dome or glass unit condition. Photos distinguish drip paths from condensation streaks.

Older tube skylights and curb-mounted units fail differently; age and brand guide next steps.

Flashing problems show as leaks only during wind-driven rain along the uphill side. Unit seal failures may weep in gentle rain or after snow melt when ice dams back water up.

Cracked domes, fogged insulated glass, and failed factory gaskets point to unit replacement even when surrounding shingles are sound.

Reflashing without replacing a failed unit wastes effort; we match the fix to the actual component.

Winter condensation on cold glass drips into wells and stains ceilings below. Bath and kitchen humidity worsens the effect in tight bathrooms with skylights.

Improved ventilation, insulated curbs, and sometimes unit upgrades with better thermal breaks reduce condensation. We explain humidity control alongside roof work.

Distinguishing condensation from intrusion prevents unnecessary roof tear-off.

Running a bath fan during showers reduces winter drip on glass below skylights.

Replacement includes removing the unit, inspecting curb decking, installing ice and water membrane at the opening, new flashing kits integrated with shingles, and the specified unit with proper insulation.

Sizing changes may need framing adjustments; we note structural limits before ordering.

Interior trim repair is often a separate finish trade after roof work dries the assembly.

Moderate temperatures help sealants and shingle integration.

• Plan replacements before winter when openings must stay dry overnight
• Address active leaks with temporary cover until full replacement schedules
• Coordinate interior painters after roof completion
• Order custom-size units early—lead times vary
• Avoid heavy snow periods for curb work on steep colonials

1970s–90s ranches in Elmwood and split-levels in the Acre often have original plastic domes past service life. Newer vaulted ceilings near West Hartford Center use larger glass units sensitive to wind exposure on open lots.

Tree shade reduces UV on domes but keeps surfaces cool—condensation risk rises in shaded baths.

Townhomes with shared roofs need neighbor notice before crane or ladder staging blocks driveways.

Vaulted ceilings in newer West Hartford builds use larger units with higher wind exposure.

Nor'easter wind drives rain uphill at headwalls on homes facing open western lots.

Townhome rows may share downspout runs—coordinate cleaning with neighbors when possible.