Fast, Reliable Duct Repair & Sealing Across Kenmore
Duct repair and sealing in Kenmore typically runs $250-$680 depending on the scope, and most jobs are completed in a single visit. Bellows Air Duct & Vent Co. has served Kenmore homeowners since 2012, and our Duct Repair & Sealing team knows the crawl spaces here like our own. Call (833) 700-5198 for a free estimate, and we’ll show you exactly what we find before any work begins.
Kenmore sits at the north end of Lake Washington where the Sammamish River flows in, and that geography shapes everything about how ducts fail here. We’re not guessing when we say your crawl space is probably wetter than you think. We’ve pulled enough sagging flex duct off NE 181st Street and through the Inglewood-Finn Hill neighborhoods to know the pattern by heart. Our technicians are background-checked, uniformed, and dispatched from Seattle with a 90-minute typical response to Kenmore calls.
Why Bellows Air Duct & Vent Co. of Seattle Is Kenmore’s Preferred Duct Repair & Sealing Company
Forty-two years in this trade means we’ve repaired ductwork in Kenmore homes through three generations of ownership. The same families call us back because our 90-Day Done Right Promise is stamped on every job, no paperwork required if something needs attention.
Kenmore customers specifically mention our camera inspections in reviews. They like seeing the before and after, especially when we’ve pulled out a section of flex duct that was pooling condensation for years. Our office answers calls 24 hours a day, live person, no voicemail. That matters when you’re smelling mustiness on a Saturday evening and want to know if it’s urgent.
We know the difference between a hillside Bothell home and a lake-flat Kenmore rambler. The drainage, the crawl space height, the original builder’s duct routing, these all change how we approach the repair. Colin Merritt, who leads Bellows, trained most of our senior technicians personally, and the company still operates on the K.E.Y.S. values code he established.
Our Duct Repair & Sealing Services in Kenmore
Duct Sealing with Mastic Sealant
Mastic sealant application in Kenmore costs $280-$450 for a typical single-system home. We use professional-grade mastic rated for damp environments because standard tape fails faster here. The persistent humidity in Kenmore crawl spaces, often exceeding 70% RH well into summer, degrades lesser sealants within a season. We brush mastic onto every joint and seam, then verify with a pressure test. The result holds against the moisture that defines this microclimate.
Flex Duct Repair and Replacement
Flex duct repair in Kenmore runs $180-$340 per section, with full replacement of a compromised run at $320-$580. This is where Kenmore’s geography hits hardest. On the lake flats, flex duct runs through crawl spaces commonly develop low-point sags that pool condensation. Technicians here routinely find standing moisture trapped in duct bellies, a failure mode that surprises crews more accustomed to Seattle’s hillier, better-drained neighborhoods.
We recently worked a 1950s rambler on NE 181st Street, near the Sammamish River slough. The homeowner smelled mustiness but thought cleaning alone would suffice. Opening the crawl space, we found three sections of sagging Rotobrush-brand flex duct with standing water in the bellies, mold had colonized the inner liner. We relocated the duct runs with steeper slopes, sealed all joints with mastic, and insulated each length. Afterward, the moisture readings dropped from 85% to 40% RH, and the musty odor vanished.
Metal Duct Repair
Metal duct repair in Kenmore ranges from $220 for spot patching to $650 for extensive section replacement. Kenmore’s residential core developed heavily in the 1950s through 1970s, leaving a large inventory of mid-century homes with original sheet-metal duct systems. These metal ducts in crawl spaces corrode from sustained 70%+ relative humidity, leading to hidden leaks that waste conditioned air and draw in ground moisture. We cut out corroded sections, fabricate replacements from matching gauge material, and seal with mastic rated for metal-to-metal joints.
Duct Insulation
Duct insulation in Kenmore costs $340-$720 depending on linear footage and R-value required. This is not an add-on here, it’s often the difference between a repair that lasts and one that repeats. Uninsulated or poorly insulated duct in a Kenmore crawl space creates thermal bridging that accelerates condensation. We use foil-faced fiberglass or closed-cell foam wraps, properly sealed at all seams, to maintain surface temperature above the dew point. In Kenmore’s moisture-saturated environment, this is what keeps the flex duct bellies dry after we’ve realigned them.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Kenmore
We stock parts and materials from Rotobrush, Nikro, and Abatement Technologies, the same brands serious HVAC contractors specify for damp-climate installations. For Kenmore homeowners, this means we don’t order and wait. We carry flex duct in standard diameters, mastic sealants formulated for high-humidity exposure, and insulation wraps rated for crawl space conditions. Most Kenmore repairs finish same-day because our trucks are loaded for the specific failure modes this microclimate produces.
Common Duct Repair & Sealing Problems We See in Kenmore Homes
- Mid-century flex duct bellied with condensation pooling in low spots. The flat terrain near Lake Washington and the Sammamish River means crawl spaces don’t drain naturally. Flex duct routed with insufficient slope collects water in its belly, collapsing airflow and breeding mold. We realign or replace before any cleaning proceeds.
- Sheet-metal ducts corroded by sustained 70%+ RH. Older Kenmore homes with original galvanized ductwork show pinhole leaks and fitting corrosion that wastes 20-30% of conditioned air into the crawl space. Camera inspection finds what homeowners can’t see.
- Mastic seals degrading faster than regional average. The combined influence of Lake Washington’s north basin and the Sammamish River corridor keeps humidity elevated longer. Standard sealants crack and peel; we use formulations rated for continuous damp exposure.
- Torn inner liners on flex duct from decades of ground moisture exposure. The 98028 zip and surrounding Kenmore neighborhoods have thousands of homes where original flex duct has never been replaced. The inner liner degrades, the insulation gets wet, and the outer jacket holds it all together just enough to hide the damage.
Pricing for Duct Repair & Sealing in Kenmore, WA
| Service | Typical Range in Kenmore |
|---|---|
| Mastic sealant application (full system) | $280-$450 |
| Flex duct repair (per section) | $180-$340 |
| Flex duct replacement (per run) | $320-$580 |
| Metal duct spot repair | $220-$380 |
| Metal duct section replacement | $420-$650 |
| Duct insulation (per system) | $340-$720 |
What moves a job toward the higher end: multiple sagging sections requiring realignment, corroded metal fittings needing fabrication, or extensive mold remediation before sealing can begin. We disclose the full price before lifting a single tool. Our $50 Off Any Repair Over $250 applies to most Kenmore duct repair jobs. Seniors and veterans receive a permanent 5% discount. Call (833) 700-5198 for an exact quote, estimates are free.
We Also Serve Cities Near Kenmore
Our Duct Repair & Sealing in Kenmore coverage extends to Lake Forest Park, Bothell, Bothell East, and Bothell West. The same moisture dynamics affect homes throughout this corridor, though Kenmore’s lake-flat geography produces the most severe condensation pooling we see in the region. Bothell’s hillside neighborhoods drain better. Kenmore’s don’t, and we adjust our repair approach accordingly.
Serving Kenmore, WA - Our Local Coverage Area
We’re based in the Kenmore area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Duct Repair & Sealing in Kenmore
The puddles come from condensation in low-sagging flex duct, not from dirty filters. Kenmore’s flat lake-flat terrain and high ambient humidity create crawl spaces where duct bellies pool water regardless of filter maintenance. We realign the duct with proper slope, replace saturated sections, and insulate to prevent future condensation. Call (833) 700-5198 for a camera inspection, estimates are free.
Original metal ducts in 1960s Kenmore homes are more prone to corrosion leaks at joints and fittings, not necessarily through the metal itself. The sustained 70%+ humidity in local crawl spaces attacks galvanized coatings and mastic seals faster than in drier suburbs. Modern flex duct, properly installed and insulated, resists this better. We camera-inspect metal systems to pinpoint exactly where air and moisture are escaping before recommending repair or replacement.
Most flex duct replacement in Kenmore does not require a permit if you’re maintaining the existing routing and not altering the HVAC system’s capacity. Significant changes to duct layout or static pressure design may trigger King County permit requirements. We handle permit research as part of our estimate process when it’s relevant. Call (833) 700-5198 and we’ll confirm for your specific job.
Insulation alone cannot stop condensation if the duct is still sagging with low points where water collects. Insulation works when paired with proper slope alignment and sealed joints. In Kenmore’s humidity, we routinely install insulation after realigning duct runs and sealing with mastic, the three together address what any single measure cannot. A $89 Seasonal Tune-Up lets us assess your specific crawl space conditions.
Damp vents after cleaning usually mean the underlying moisture source was never addressed. Cleaning removes debris but cannot fix sagging flex duct that pools condensation or corroded metal leaking crawl space air into the system. In Kenmore’s moisture-saturated environment, repair and sealing must precede or accompany cleaning for lasting results. We offer a Free Second Opinion on Any Written Estimate if another company proposed cleaning without inspecting for these failure modes.
Call Bellows Air Duct & Vent Co. at (833) 700-5198 for duct repair and sealing in Kenmore. We’ll show you what your crawl space looks like on camera, quote one honest price before we start, and stand behind the work for 90 days with no paperwork if you need us back.
Written by Colin Merritt, Owner at Bellows Air Duct & Vent Co., serving Kenmore since 2012.