Manchester's humid continental climate brings repeated freeze-thaw cycles that crack butyl tape and compress neoprene gaskets on skylights installed in the 1980s and 1990s row houses common in the North End and Rimmon Heights. Older homes in these neighborhoods often have aluminum-framed skylights set into low-slope roofs that collect snow and ice dams, forcing water past failed perimeter seals. We match the original gasket profile or upgrade to EPDM where roof pitch allows better drainage toward Amoskeag Falls.
Edge cases appear regularly on East Side capes where skylights sit near chimneys or meet asphalt shingles that have cupped from decades of exposure. In those spots we remove the old foam tape entirely rather than layering new silicone over it, because trapped moisture will push through again once temperatures swing. Access on the steeper West Side roofs sometimes requires staging that adds time but prevents damage to the existing flashing.
Hillsborough County code requires that any work affecting the roof membrane maintain the original fire rating, so we document the existing skylight curb condition before touching the sealants. Homeowners in Bakersville and Hallsville frequently call after noticing ceiling stains following a March thaw; the leak path usually traces back to a single failed corner gasket rather than the entire unit.
Technician insight
In Manchester the thing that catches most people out with Skylight Sealant & Gasket Repair is the way ice dams along the North End and Downtown row houses push water under the lower curb edge even after the gasket looks intact; the real fix is often restoring the flashing overlap rather than just swapping the visible seal.
West Side Cape Leak After March Thaw
Homeowner noticed brown stains on the second-floor ceiling near a 25-year-old skylight. We found the original neoprene gasket had hardened and pulled away at the downhill corner where snow had piled against the curb. After removing the old material and installing a new EPDM gasket plus self-adhered flashing tape, the next heavy rain produced no further interior moisture.
Skylight Sealant & Gasket Repair Services We Offer
✓Butyl Tape Replacement
Remove deteriorated butyl tape around skylight curbs and install fresh 1/8-inch tape rated for New England freeze-thaw exposure.
✓EPDM Gasket Swap
Replace compressed neoprene or vinyl gaskets with EPDM profiles that hold flexibility through Manchester's cold winters.
✓Perimeter Silicone Re-Seal
Clean and apply high-grade neutral-cure silicone at the skylight-to-flashing joint on homes in the South End and Goffes Falls.
✓Corner Leak Patch
Target single failed corners on older aluminum skylights common in Amoskeag Millyard conversions without full skylight removal.
✓Flashing Tape Integration
Install self-adhered flashing tape over existing curb seals to bridge small gaps created by roof movement near SNHU Arena.
Skylight Sealant & Gasket Repair Cost in Manchester, NH
| Service | Typical Range | What Affects It |
|---|---|---|
| Single Corner Gasket Repair | $225–$375 | Price rises with steep pitch on West Side homes |
| Full Perimeter Gasket Replacement | $450–$750 | Includes new EPDM and flashing tape integration |
| Butyl Tape Refresh Only | $300–$500 | Lower cost when original gaskets remain serviceable |
| Silicone Re-Seal with Inspection | $275–$425 | Common on 1990s homes in Rimmon Heights |
Ranges are typical for Manchester, NH and confirmed with an exact written quote before any work starts.
How it works
- 1
On-Site Assessment
Inspect the skylight from both inside and on the roof, noting gasket condition, curb flashing, and nearby ice dam risk.
- 2
Material Removal
Scrape away old sealant and tape down to clean substrate without disturbing the original skylight frame.
- 3
New Seal Application
Install fresh gaskets or tape matched to the curb profile, then tool compatible sealant at all joints.
- 4
Water Test and Cleanup
Run a controlled hose test and check interior ceilings before leaving the site.
Pricing
Most sealant and gasket repairs on Manchester skylights range from a few hundred dollars for corner work up to mid-range for full perimeter renewal depending on roof access and material choice.