Fast, Reliable Duct Repair & Sealing Across Kenton
Duct repair and sealing in Kenton typically runs $280–$650 for most homes, with same-week scheduling available throughout the 97217 ZIP code and surrounding North Portland neighborhoods. We’re familiar with the specific challenges of Kenton’s pre-WWII housing stock — retrofit ductwork crammed into damp crawl spaces, legacy gravity-furnace remnants, and corrosion from Columbia Slough floodplain moisture. Our Duct Repair & Sealing team serves Kenton directly from our Seattle base, with Richard Anderson, Owner and Lead Technician, personally overseeing every job. Call (877) 335-1974 for a free estimate.
Why Landmark Air Duct Cleaning Service Washington Is Kenton’s Preferred Duct Repair & Sealing Company
We’ve built our reputation on 11 years of exclusive focus on air duct and indoor air quality work — not as a sideline to general HVAC, but as our only trade. That specialist focus shows in how we handle Kenton’s unique housing challenges. Our 732 verified reviews average 4.9 stars, and that volume matters: it means we’ve solved duct problems in hundreds of real homes with conditions similar to yours.
Richard Anderson doesn’t delegate to rotating crews. He’s Owner and Lead Technician on every job, meaning the person quoting your Kenton bungalow’s crawl space repair is the same person running the equipment and signing off on the work. That accountability structure is rare in this industry.
We know Kenton’s streets — Denver Avenue, Lombard Street, the grid of bungalows between the slough and Interstate 5. We understand how that specific geography, with its chronically damp crawl spaces and retrofit-era ductwork, creates failure patterns you won’t find in Vancouver’s newer subdivisions or Portland’s east-side neighborhoods.
Our Duct Repair & Sealing Services in Kenton
Duct Sealing
Air leaks in Kenton’s retrofit ductwork waste 20–30% of conditioned air on average, but in homes with 1950s–60s aftermarket installations, we’ve measured losses above 40%. Our sealing process starts with pressure testing to map every leak, then we seal accessible joints with mastic and mechanical fasteners — never duct tape, which fails within months in damp crawl spaces. For Kenton homes near the Columbia Slough, where floodplain moisture accelerates corrosion, we pay particular attention to seam failures at trunk-to-branch transitions.
Flex Duct Repair
Flex duct in Kenton bungalows was often installed with tight bends around original floor joists and plumbing stacks — geometry that crushes airflow and collects debris. In a 1924 Craftsman on Denver Avenue, our crew found a portion of the original gravity-furnace trunk still connected to modern flex duct. The dead-leg section had never seen airflow and was packed with decades of mold and rodent debris. We sealed off that legacy trunk, repaired the transition with a new metal boot, and applied mastic to the surviving joints. That’s the difference between a generalist who replaces what’s visible and a specialist who traces the full system.
Metal Duct Repair
Kenton’s original steel ductwork from the 1950s–60s retrofit era is often still structurally sound but leaking at every joint. We repair these with custom-fabricated patches, new collars where original connections have corroded, and proper support brackets where sagging has opened seams. The goal is preserving functional metal rather than defaulting to full replacement — a decision that saves Kenton homeowners significant cost when the trunk lines themselves are intact.
Duct Insulation
Unconditioned crawl spaces in Kenton, especially those within the slough’s moisture influence, destroy fiberglass duct insulation within 5–7 years. We remove saturated, mold-compromised insulation and replace it with closed-cell foam or properly sealed fiberglass wraps rated for damp environments. This isn’t cosmetic — it’s the thermal barrier that prevents condensation on cold duct surfaces, which is what drives the biofilm growth we see so frequently in this neighborhood.
What happens when you call
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A real person answersNo phone trees — you reach a local pro.
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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 Kenton
We work with Honeywell and Aprilaire air quality components when your duct repair project includes upgrading filtration or humidity control — common needs in Kenton’s moisture-challenged homes. For sanitizing after mold remediation in dead-leg sections or flood-affected crawl spaces, we use Abatement Technologies HEPA containment and Guardsman antimicrobial treatments. We stock repair parts for these systems, so Kenton customers aren’t waiting on shipping for a metal boot, collar, or mastic application that could have been done same-day.
Common Duct Repair & Sealing Problems We See in Kenton Homes
- Retrofit ductwork in wet crawl spaces corrodes at joint seams. Kenton’s proximity to the Columbia Slough means ground moisture wicks into unconditioned spaces year-round. That moisture condenses on cold duct metal, accelerates rust at seams, and opens hidden air leaks that waste conditioned air while drawing in floodplain humidity and musty odors.
- Non-standard bends and mismatched trunk sizing resist standard cleaning tools. Aftermarket ducts in 1910s–1930s bungalows were routed around obstacles the original builders never anticipated. Our Rotobrush and Nikro equipment handles these geometries, but the debris left behind by less capable systems breeds biofilm when Portland’s winter humidity spikes.
- Legacy gravity-furnace trunk remnants create stagnant dead-legs. These sections accumulate mold and rodent debris across decades, and they’re easy to miss unless someone traces the full original floor plan. We’ve found them hidden behind finished basement walls and above dropped ceilings throughout Kenton’s bungalow stock.
- Flex duct collapses under its own weight or external pressure. In Kenton’s tight crawl spaces, flex duct gets crushed by storage items, compressed by insulation settling, or pinched between joists. Collapsed sections stop airflow entirely to downstream rooms and create back-pressure that stresses your HVAC blower.
Pricing for Duct Repair & Sealing in Kenton, OR
Here’s what duct repair and sealing costs in Kenton’s market:
- Duct sealing (typical 1,200–2,000 sq ft home): $280–$450
- Flex duct repair or section replacement: $180–$340 per run
- Metal duct repair with custom patches/collars: $220–$480
- Duct insulation replacement (per linear foot): $8–$14
- Mastic sealant application to full joint set: $150–$280
- Dead-leg trunk sealing and transition repair: $320–$580
Actual cost depends on crawl space accessibility, extent of corrosion or mold damage, and whether we need to fabricate custom metal fittings for non-standard Kenton layouts. Homes with intact original floor plans — where we can trace the full duct path — typically fall at the lower end. We provide exact quotes after inspection, and estimates are free. Call (877) 335-1974 to schedule.
We Also Serve Cities Near Kenton
Our service area extends throughout the Portland-Vancouver corridor. We regularly work in North Portland neighborhoods with similar bungalow stock, Portland proper for larger multi-unit properties, Minnehaha for its mix of vintage and mid-century homes, and Vancouver where newer construction presents different duct challenges. Each city gets the same owner-led approach from Richard Anderson and our team.
Serving Kenton, OR — Our Local Coverage Area
We’re based in the Kenton 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 Kenton
Yes, in most cases we can seal 1950s-era steel ducts without full replacement if the trunk lines are structurally intact. We pressure-test to confirm metal integrity, then repair leaks with custom patches, new collars at corroded joints, and mastic sealant. Replacement becomes necessary only when rust has perforated the metal or when original trunk sizing is too small for modern HVAC loads. Call (877) 335-1974 and we’ll inspect your specific system — estimates are free.
We elevate new duct runs on proper hangers rather than resting them on damp ground, use corrosion-resistant fasteners and sealed mastic joints, and recommend insulating with closed-cell foam rather than fiberglass in flood-prone areas. If your crawl space has active water intrusion, we’ll note it and can recommend remediation specialists we’ve worked with in Kenton. The duct repair itself won’t solve groundwater issues, but we build to survive them. Call (877) 335-1974 to discuss your specific crawl space conditions.
Collapsing flex duct is typically a replacement issue, not a repair. Once the internal wire helix has kinked or the insulation has compressed, the duct won’t maintain its shape or R-value. We replace collapsed runs with properly supported new flex or, in tight Kenton crawl spaces, often upgrade to rigid metal for durability. A single collapsed run usually runs $180–$340 installed. Call (877) 335-1974 for an exact quote — we’ll assess whether your whole system needs re-supporting or just the failed section.
Yes, we can patch isolated holes in metal ductwork using custom-fabricated metal patches, collar repairs, or mastic-reinforced mesh for smaller penetrations. This is common in Kenton where rodent activity or corrosion has opened localized damage while the surrounding trunk remains sound. Patching runs $120–$260 depending on accessibility and size. We only recommend full run replacement when damage is extensive or the original duct is undersized. Call (877) 335-1974 to schedule an inspection.
Yes, we remove waterlogged or mold-compromised insulation and replace it with materials rated for damp crawl space environments — typically closed-cell foam or sealed fiberglass wraps. In Kenton’s moisture-influenced crawl spaces, this is often necessary alongside leak repair, since saturated insulation loses its thermal value and becomes a mold substrate. Insulation replacement runs $8–$14 per linear foot. Call (877) 335-1974 and we’ll assess whether your insulation can be salvaged or needs full replacement.
Ready to fix your Kenton home’s duct problems? Whether you’ve got a collapsing flex run, a leaking metal trunk, or a mysterious dead-leg from the gravity-furnace era, we’ll trace it, diagnose it, and give you an exact repair quote with no obligation. Richard Anderson, Owner and Lead Technician, personally oversees every Kenton job. Call (877) 335-1974 today for your free estimate.
Written by Richard Anderson, Owner at Landmark Air Duct Cleaning Service Washington, serving Kenton and the greater Portland-Vancouver area since 2013.