Longmont's semi-arid climate brings warm summers followed by heavy snow loads that sit on roofs through freeze-thaw cycles. Older homes in Old Town and Kensington often have layered asphalt shingles or aging wood shakes where ice dams form along eaves and push water under flashing. A proper inspection starts from the attic, checking for daylight, stained rafters and wet insulation before any exterior work begins.
Boulder County building practices from the 1960s through 1980s left many Sunset and Downtown Longmont roofs with limited ventilation and single-layer underlayment. Left Hand Creek drainage patterns can send wind-driven rain against north-facing slopes during spring storms. We map every penetration, valley and step flashing because these details fail first when snowmelt refreezes overnight.
Roof access in Longmont varies sharply between flat ranch homes near Roosevelt Park and steeper two-story houses near the Longmont Museum. We note soffit condition, ridge vent function and any recent tree trimming that may have damaged shingles. These observations determine whether the leak source is a simple flashing issue or a broader ventilation problem that will repeat next winter.
Technician insight
In Longmont, the thing that catches most people out with Roof Leak Detection & Inspection is how quickly snowmelt from the foothills refreezes on north-facing slopes in Old Town. Homes built before 1980 often lack the underlayment and ventilation needed to handle that cycle, so a leak that shows up in March usually started as an ice dam in January.
Hidden Leak Behind Chimney Flashing
Water stains appeared on a ceiling in a 1970s Sunset home after a late-March warm spell. We traced the path through the attic to failed step flashing around the chimney. New flashing and underlayment extension stopped the intrusion before the next freeze.
Roof Leak Detection & Inspection Services We Offer
✓Attic Leak Tracing
Systematic attic inspection that follows water stains to the exact roof entry point common in older Longmont homes.
✓Ice Dam Assessment
Evaluation of roof edges and valleys for ice dam risk after heavy snow events in neighborhoods like Old Town and Sunset.
✓Drone Perimeter Survey
Aerial review of flashing, valleys and penetrations on two-story homes where ladder access is limited.
✓Flashing and Valley Inspection
Close examination of step flashing, chimney boots and valley liners that fail first during Longmont freeze-thaw cycles.
✓Ventilation and Moisture Check
Measurement of attic airflow and humidity levels that contribute to hidden condensation leaks in Kensington and Downtown Longmont.
Roof Leak Detection & Inspection Cost in Longmont, CO
| Service | Typical Range | What Affects It |
|---|---|---|
| Standard Leak Detection Visit | $225–$375 | Single-story homes in Old Town or Kensington; two-story adds to time and safety requirements. |
| Ice Dam And Attic Bundle | $325–$475 | Includes moisture meter readings after heavy snow. |
| Drone-Only Survey | $175–$275 | When ground access is restricted or roof pitch is steep. |
Ranges are typical for Longmont, CO and confirmed with an exact written quote before any work starts.
How it works
- 1
Schedule And Access Review
We confirm roof age, access points and any prior repairs while noting neighborhood specifics such as tree cover near Roosevelt Park.
- 2
Attic Examination
Interior inspection for stains, mold and insulation damage before exterior work begins.
- 3
Exterior Mapping
Systematic check of shingles, flashing and penetrations from the ground and roof surface.
- 4
Findings And Next Steps
Clear report of leak sources with photos and recommended repairs or monitoring plan.
Pricing
Upfront pricing after we confirm roof access and number of stories.