Manchester's humid continental climate brings heavy snow loads and repeated freeze-thaw cycles that drive water under skylight curbs on commercial roofs. Buildings in the Amoskeag Millyard and Downtown often feature older metal or masonry curbs with original flashing that has fatigued after decades of exposure. Technicians check for ice dam formation along the lower edge first, because meltwater backs up under the skylight frame long before interior staining appears.
Edge cases include multi-pane units on low-slope roofs near the Currier Museum of Art where thermal bridging causes condensation inside the frame even when the exterior seal remains intact. Hillsborough County code requires any curb height modification to maintain proper cricket slope and positive drainage; skipping this step during repair frequently leads to ponding that accelerates membrane failure. We always verify the existing roof assembly thickness before specifying new flashing heights to avoid creating new low spots.
Replacement work in the North End and Rimmon Heights commonly involves coordinating with property managers to stage lifts on narrow side streets without blocking SNHU Arena event traffic. Material selection favors thermally broken aluminum curbs with EPDM or silicone gaskets rated for continuous snow cover rather than standard residential units that lack the required load ratings.
Technician insight
In Manchester the thing that catches most people out with commercial skylight repair is underestimating how quickly snow load on low-slope roofs in the Millyard pushes water under old curbs during the first February thaw. Many owners assume a visible interior stain means only a new seal is needed, but the real issue is often missing cricket slope or rotted decking from repeated ice dam cycles that only shows up once you open the curb.
Downtown Mill Conversion Leak
Water appeared along the north wall of a former textile building near Amoskeag Falls after a heavy March snow. Inspection showed failed original flashing and a flattened cricket allowing ponding. We replaced the curb flashing, rebuilt the cricket, and added perimeter heat trace. No further leaks occurred through the next two winters.
Commercial Skylight Repair Services We Offer
✓Commercial Skylight Leak Detection
Infrared and moisture meter scanning identifies hidden water intrusion paths under curbs in Amoskeag Millyard mill conversions before interior damage spreads.
✓Ice Dam Mitigation for Skylights
Heat trace cable installation and curb insulation upgrades prevent meltwater backup common on Manchester commercial roofs during prolonged cold snaps.
✓Curb Flashing Replacement
Removal of deteriorated counterflashing and step flashing on older Downtown buildings followed by new lead or copper detailing matched to existing roof slope.
✓Skylight Sealant Refresh
High-performance silicone or polyurethane re-sealing of perimeter joints on multi-unit commercial arrays in the South End and Bakersville to restore weather tightness.
✓Commercial Skylight Frame Repair
Straightening or reinforcing warped aluminum frames on West Side warehouse skylights damaged by snow load or thermal movement.
Commercial Skylight Repair Cost in Manchester, NH
| Service | Typical Range | What Affects It |
|---|---|---|
| Single Skylight Seal Repair | $450–$950 | Varies with curb height and whether deck repair is required. |
| Multi-Unit Flashing Refresh | $1,200–$2,800 | Common on Amoskeag Millyard buildings with six or more skylights. |
| Ice Dam Heat Trace Addition | $600–$1,400 | Per unit; includes controls and wiring. |
| Full Curb Replacement | $1,800–$3,500 | Includes cricket rebuild and membrane tie-in. |
Ranges are typical for Manchester, NH and confirmed with an exact written quote before any work starts.
How it works
- 1
Site Assessment
Roof access from Elm Street or side alleys to inspect curb condition, slope, and existing flashing on the specific Manchester building.
- 2
Moisture Mapping
Non-destructive scanning to trace leak paths and confirm whether damage extends into the roof deck or insulation layers.
- 3
Targeted Repair
Replacement of failed gaskets, flashing, or curb sections using materials compatible with the building's original roof system.
- 4
Drainage Verification
Post-repair water testing and cricket adjustments to ensure meltwater flows away from the skylight during spring thaw.
Pricing
Upfront quotes after on-site inspection; final price depends on roof access, number of units, and extent of deck damage.