Metal roofs in Longmont expand and contract sharply when winter snow loads sit on panels during the day then freeze overnight. This movement often opens seams and lifts fasteners along ridges and valleys near Left Hand Creek where moisture lingers. Technicians check panel overlap, butyl tape condition, and screw torque rather than applying sealant as a first fix. Homes in Old Town and Kensington frequently have 20- to 30-year-old standing-seam or corrugated systems that require matching profiles to avoid new leak paths.
Flashing around chimneys, skylights, and plumbing vents fails faster here because Boulder County wind carries grit that abrades the metal-to-metal contact points. In Sunset and Downtown Longmont, low-slope sections behind parapets collect pine needles and cottonwood fluff that trap water against the metal. Repairs focus on replacing step flashing with wider pieces and adding cricket saddles where roof planes meet walls. UV exposure during warm summers also degrades factory coatings, so technicians inspect for chalking before deciding whether a seam repair will hold.
Access on single-story bungalows in Roosevelt Park is straightforward, but two-story homes near the Longmont Museum often need ladder staging on narrow side yards. Crews verify that any new screws land in solid substrate rather than old stripped holes. After repair they run a hose test along the affected slope for at least ten minutes, checking both interior ceilings and attic sheathing for moisture that could have traveled laterally under the metal.
Technician insight
In Longmont the thing that catches most people out with metal roof leak repair is assuming the leak is at the obvious hole when it is actually water that traveled sideways under the panels after melting on a south-facing slope. Old Town and Kensington homes with 25-year-old corrugated roofs see this every spring when snow sits against the ridge then refreezes at night.
Ridge Cap Leak on Kensington Bungalow
Water stains appeared on the ceiling after a March snow melt. Inspection showed the ridge cap had lifted where thermal movement had broken the original sealant. New wider ridge cap with fresh butyl tape and closure strips was installed, followed by a hose test that confirmed the slope stayed dry.
Metal Roof Leak Repair Services We Offer
✓Standing Seam Leak Sealing
Re-crimps and seals factory seams that have opened from thermal movement on Longmont metal roofs.
✓Flashing Replacement at Penetrations
Removes and installs new step flashing around chimneys, vents, and skylights common on Old Town homes.
✓Ridge Cap and Valley Repair
Replaces damaged ridge caps and valley pans that collect snow melt near Left Hand Creek drainage paths.
✓Fastener and Washer Replacement
Swaps stripped or corroded screws and installs new EPDM washers to stop leaks on corrugated panels.
✓Panel Section Replacement
Cuts out and matches new metal panels where hail or tree damage has punctured roofs in Kensington.
Metal Roof Leak Repair Cost in Longmont, CO
| Service | Typical Range | What Affects It |
|---|---|---|
| Seam sealing only | $250–$550 | Single slope, no panel removal |
| Flashing replacement | $400–$850 | Chimney or skylight, includes new step flashing |
| Panel section swap | $650–$1,400 | One to three panels plus matching finish |
| Ridge cap repair | $350–$700 | Includes new closure strips and fasteners |
Ranges are typical for Longmont, CO and confirmed with an exact written quote before any work starts.
How it works
- 1
Site Inspection
Walk the roof from both ground and attic to map every leak point and note panel type and slope.
- 2
Moisture Assessment
Use infrared and moisture meter readings to trace how far water has traveled under the metal.
- 3
Targeted Repair
Execute seam sealing, flashing swaps, or panel replacement using matching materials and proper fasteners.
- 4
Water Test and Documentation
Run controlled hose test, photograph repairs, and note any additional work needed for the homeowner.
Pricing
Most metal roof leak repairs in Longmont fall between a few hundred dollars for seam work and over a thousand when panel replacement or staging is needed.