Longmont homes built before 1980 in Old Town and Downtown Longmont often have original rubber or lead pipe boots that harden and split after repeated snowy winters followed by warm summer UV exposure. These failures let water track down vent pipes into attics, especially where Left Hand Creek humidity keeps roof decks damp longer than in drier parts of Boulder County. We replace the boots with EPDM or high-temperature silicone flashings that match the existing shingle profile and maintain proper pitch so snow does not pond around the penetration.
Edge cases appear on steeper roofs in the Sunset and Kensington neighborhoods where access requires roof jacks and temporary tarping to protect interiors during the job. We also see vent boots pulled loose by wind-driven snow along the Front Range corridor between Longmont and Loveland. In these situations we inspect the decking for rot, sister any compromised rafters, and reinstall the boot with new step flashing rather than relying on sealant alone.
Boulder County building code requires that any roof penetration repair on homes over 25 years old be flashed to current IRC standards, which means extending the new boot at least 4 inches up the pipe and 6 inches onto the roof plane. Homeowners who attempt DIY fixes with canned sealant usually see the same leak return within one season because the underlying movement from thermal expansion is never addressed.
Technician insight
In Longmont, the thing that catches most people out with Roof Vent & Pipe Boot Repair is how quickly the rubber hardens on south-facing slopes in Old Town after just two or three winters of snow sitting against the boot then baking in summer sun. The creek humidity keeps the deck wet longer, so even small cracks let water travel far before it shows up inside.
Leaking Pipe Boot on 1970s Ranch in Sunset
Homeowner noticed water stains above the laundry room after March snowmelt. We found the original lead boot on the main vent had split where it met the shingle valley. After removing the old flashing and sistering one rotted rafter tail, we installed a new EPDM boot with extended step flashing. The attic stayed dry through the next spring thaw.
Roof Vent & Pipe Boot Repair Services We Offer
✓Pipe Boot Replacement
Remove failed rubber or lead boots around plumbing vents and install new EPDM boots flashed to current code on homes in Old Town and Kensington.
✓Roof Vent Flashing Repair
Re-seal and re-flash turbine, ridge, and static vents that have pulled away from the deck after winter snow loads in Sunset neighborhoods.
✓Chimney Pipe Boot Repair
Replace high-temperature boots around furnace and water-heater vents that crack from repeated freeze-thaw cycles common along Left Hand Creek.
✓Skylight Boot Sealing
Repair perimeter boots and step flashing on skylights where UV degradation allows meltwater to enter attics in Downtown Longmont homes.
✓Solar Vent Boot Upgrade
Install reinforced boots around new or existing solar attic vents to handle both summer heat and heavy spring snow in Boulder County.
Roof Vent & Pipe Boot Repair Cost in Longmont, CO
| Service | Typical Range | What Affects It |
|---|---|---|
| Standard Pipe Boot Replacement | $225–$475 | Single-story homes in Old Town; higher on two-story or steep roofs in Kensington |
| Multiple Vent Boot Package | $650–$1,100 | Three or more penetrations on the same plane; common on Sunset bungalows |
| Chimney or High-Temp Boot | $300–$550 | Requires heat-rated materials; price rises with roof height near Roosevelt Park |
| Skylight Perimeter Repair | $275–$500 | Includes new step flashing; deck work adds to the range |
Ranges are typical for Longmont, CO and confirmed with an exact written quote before any work starts.
How it works
- 1
On-Site Inspection
We climb the roof from accessible points in the target neighborhood and check every penetration for cracked boots, lifted flashing, and deck rot.
- 2
Material Selection
We match the existing roofing type and pitch, choosing EPDM or high-temp silicone boots rated for Longmont's temperature swings.
- 3
Removal and Prep
Old boots and sealant are cut away, damaged decking is repaired, and new step flashing is installed to maintain water flow.
- 4
New Boot Installation
The replacement boot is slid into place, sealed at the pipe collar, and integrated with existing shingles so snow cannot pond.
- 5
Final Walk and Photos
We document the finished work from the ground and attic, then provide the homeowner with a written summary of what was replaced.
Pricing
Upfront written quotes after roof inspection; price varies by roof pitch, access, and whether deck repairs are needed.