Fort Collins homes built before 1990 in Old Town and near Colorado State University often have original skylights with butyl tape or neoprene gaskets that harden after repeated winter freezes. Semi-arid summers add intense UV that cracks silicone beads along the curb, allowing snowmelt to track under the flashing and into attic insulation. Technicians at 1093 W Elizabeth St match replacement gaskets to the exact curb profile rather than using generic stock that fails again within two seasons.
Edge cases appear on homes in Prospect Park and Harmony where roof pitches meet at odd angles near Horsetooth Reservoir winds. Here, standard caulk pulls away from aluminum frames during the first hard freeze because the metal contracts faster than the sealant. Proper repair requires backer rod plus a high-movement polyurethane that stays flexible down to -20°F, plus new counter-flashing tucked under existing shingles without disturbing the underlayment.
Larimer County code requires any skylight work that touches the roof membrane to maintain positive drainage; simply adding more sealant over old material often creates a dam that worsens ponding. Crews remove the old gasket completely, clean oxidized metal with a non-etching solvent, then install new EPDM or silicone gaskets rated for the local temperature swing before reinstalling the dome and pressure-testing with a hose.
Nearby Loveland and Windsor properties share the same wind-driven rain patterns, but Fort Collins homes closer to Downtown see more shade from mature trees that slows drying and promotes algae on the seal surface. This requires an additional algae-resistant primer step that is skipped in sunnier neighborhoods.
Technician insight
In Fort Collins the thing that catches most people out with Skylight Sealant & Gasket Repair is assuming the original neoprene on 1980s Old Town homes will last another decade; the repeated freeze-thaw cycles along the Front Range make those gaskets brittle by year twelve, and the first heavy snowmelt finds every micro-crack.
Downtown Fort Collins Skylight Leak After Early Snow
Homeowner noticed water stains on the ceiling after the first October snow. Inspection showed the original gasket had pulled away from the curb on the south-facing skylight. Crew removed the failed gasket, cleaned the curb, and installed a new EPDM gasket with compatible sealant. No further leaks appeared during the rest of the winter.
Skylight Sealant & Gasket Repair Services We Offer
✓Neoprene Gasket Replacement
Remove hardened original gaskets on pre-1990 skylights and install new closed-cell neoprene sized to the curb, restoring compression seal against winter contraction.
✓UV-Degraded Sealant Refresh
Cut out cracked silicone or butyl along the curb and flashing, then apply high-movement polyurethane rated for Fort Collins temperature swings and intense summer UV.
✓Flashing Integration Repair
Lift shingles to inspect step flashing around the skylight, replace corroded pieces, and ensure water is directed away from the seal on older Old Town roofs.
✓Curb Condensation Gasket Upgrade
Install additional thermal-break gaskets on skylights over living spaces in Downtown and Prospect Park homes where warm indoor air meets cold glass and creates moisture at the seal.
✓Emergency Leak Sealing
Apply temporary high-tack sealant and tape on active leaks reported from Harmony or near Horsetooth Reservoir until full gasket replacement can be scheduled.
Skylight Sealant & Gasket Repair Cost in Fort Collins, CO
| Service | Typical Range | What Affects It |
|---|---|---|
| Single skylight gasket replacement | $275–$475 | Price rises with two-story access or when flashing must be lifted. |
| Sealant refresh on two skylights | $350–$550 | Includes removal of old material and new high-movement caulk. |
| Emergency temporary seal | $150–$250 | Applied same-day when active leaking is reported during business hours. |
| Full curb inspection and report | Free with repair | Otherwise $95 if no work is performed. |
Ranges are typical for Fort Collins, CO and confirmed with an exact written quote before any work starts.
How it works
- 1
On-Site Inspection
Technician climbs the roof from the address at 1093 W Elizabeth St, documents gasket condition, checks for curb rot, and notes nearby tree cover or wind exposure typical in each Fort Collins neighborhood.
- 2
Material Selection
Match replacement gasket or sealant to the skylight manufacturer and local climate demands, confirming the product remains flexible through Larimer County winter lows.
- 3
Old Material Removal
Scrape away failed sealant and gaskets without damaging the curb or flashing, then clean oxidized surfaces so new material bonds directly to metal or wood.
- 4
New Seal Installation and Test
Install fresh gaskets or sealant, reinstall the dome, and run a controlled water test to verify no migration into the attic before leaving the site.
Pricing
Upfront quotes after roof inspection; final price depends on skylight accessibility and whether curb repairs are needed.