Fast, Reliable Duct Repair & Sealing Across Beaverton
Duct repair and sealing in Beaverton typically costs $180–$650 depending on whether we’re spot-sealing joints with mastic or replacing degraded flex duct runs, and most repairs are completed same-day. If you’re noticing uneven heating, musty odors when your heat pump kicks on, or energy bills climbing in your Murrayhill or Cooper Mountain home, degraded ductwork is the likely culprit. We’re familiar with the specific challenges of Beaverton’s 1980s–1990s tract housing stock, and we carry the professional-grade equipment to handle repairs from Cedar Hills to Sexton Mountain. Call us at (877) 335-1974 for a free estimate — we’ll diagnose the problem and give you upfront pricing before any work begins.
Why Landmark Air Duct Cleaning Service Washington Is Beaverton’s Preferred Duct Repair & Sealing Company
We’ve built our reputation in Beaverton on 11 years of exclusive focus on indoor air quality — not as an HVAC add-on, but as our sole trade. Our Duct Repair & Sealing team is led by Richard Anderson, who serves as both owner and lead technician on every job. That means direct owner accountability from the moment we arrive at your Beaverton home until the final seal is tested.
Our track record speaks through numbers: 732 verified customer reviews averaging 4.9 stars. Beaverton homeowners specifically mention our thoroughness with older flex duct systems and our willingness to explain repair-versus-replacement options without pressure. We respond to Beaverton calls promptly, and we know the local housing patterns — from the split-levels near Cooper Mountain to the rambler clusters off Murray Boulevard — well enough to arrive prepared for what we’ll find.
Unlike generalist HVAC companies that rotate through seasonal crews, we’re specialists. Richard Anderson personally runs the Rotobrush and Nikro equipment on every job. That consistency matters when we’re crawling through a damp Beaverton crawl space to trace a disconnected duct run that’s been leaking conditioned air for years.
Our Duct Repair & Sealing Services in Beaverton
Duct Sealing with Mastic Sealant
Beaverton’s persistent maritime humidity — especially during the October-to-May shoulder season — makes mastic sealant our go-to solution for joint failures. We brush or trowel water-based mastic onto every connection point, creating a flexible, permanent seal that tape alone can’t match. In homes near Sexton Mountain where original 1980s duct tape has dried and cracked, we remove the old adhesive residue entirely before applying fresh mastic. A typical mastic sealing job for a Beaverton single-story runs $180–$320.
Flex Duct Repair
This is where Beaverton’s housing stock hits hardest. The flexible plastic ductwork installed during the Silicon Forest boom is now 30–40 years old, sagging under its own weight plus decades of moisture absorption. In a Cooper Mountain split-level, we found a 35-year-old flex duct run in an unconditioned crawl space had developed micro-tears and sags that trapped debris. The homeowner’s heat pump ran continuously, pushing moist air through the degraded system, which had colonized mold. We repaired the torn sections, re-sealed all joints with mastic, and insulated the duct to prevent future condensation. Spot repairs on Beaverton flex duct typically run $240–$450; full runs average $380–$650.
Metal Duct Repair
While less common in Beaverton’s dominant tract-home stock, we do encounter galvanized metal duct in older basements and in some West Haven-Sylvan additions. Rust-through at seams and disconnected collars are the usual failures. We patch with matching gauge metal, seal with mastic, and wrap with proper insulation. Metal repairs in Beaverton generally fall between $200–$380.
Duct Insulation
Beaverton’s crawl spaces without vapor barriers — and there are many, particularly in pre-1995 construction — create condensation nightmares on uninsulated or degraded duct wrap. We install fresh fiberglass or closed-cell insulation around repaired ductwork, sealing the vapor barrier properly to the crawl space ground. This prevents the moisture cycling that destroys flex duct from the outside in. Insulation work in Beaverton typically adds $150–$280 to a repair job.
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 Beaverton
We maintain relationships with Honeywell, Aprilaire, and Abatement Technologies for air quality components that integrate with repaired duct systems — UV sanitizers, media filters, and whole-home purifiers that address the mold and particulate issues common to Beaverton’s damp climate. For sealing and repair materials, we use professional-grade mastic and insulation products matched to Pacific Northwest building codes. We stock common flex duct diameters and fittings locally, so most Beaverton repairs don’t wait on parts. When we recommend a product upgrade after sealing your ducts, it’s because we’ve tested it in conditions like yours — not because it’s on a sales sheet.
Common Duct Repair & Sealing Problems We See in Beaverton Homes
- Heat pump systems in west-side hillside homes run year-round, accelerating flex duct degradation from constant airflow and moisture. Unlike furnace-only homes that sit idle all summer, Beaverton’s Cooper Mountain and Sexton Mountain heat pump installations circulate air continuously, wearing duct interiors faster and distributing any contamination through every season.
- Flex duct in unconditioned crawl spaces without vapor barriers sags over time, trapping debris and promoting mold in Beaverton’s damp maritime climate. With 37 inches of annual rainfall and humidity-heavy shoulders, moisture intrusion into crawl-space runs is routine — especially in Murrayhill and Cedar Hills homes built before modern vapor barrier requirements.
- Original 1980s–1990s flex duct joints often separate under the weight of insulation and moisture, causing severe air leaks and drawing in crawl space contaminants. We regularly find completely disconnected collars in Beaverton crawl spaces, where the duct is literally blowing conditioned air into the dirt.
- Fine Tualatin Valley clay dust infiltrates through micro-tears in aging flex duct, coating interiors and restricting airflow. This clay is distinct from Portland’s siltier soils — harder, more abrasive, and particularly hard on blower motors and heat pump coils when it circulates freely.
Pricing for Duct Repair & Sealing in Beaverton, OR
| Service | Typical Range in Beaverton |
|---|---|
| Mastic sealant application (joint sealing) | $180–$320 |
| Spot flex duct repair (tear/sag section) | $240–$450 |
| Full flex duct run replacement | $380–$650 |
| Metal duct patch and seal | $200–$380 |
| Duct insulation (per run, with repair) | $150–$280 |
| Air leak detection and comprehensive sealing | $280–$520 |
What moves you within these ranges? Accessibility of your crawl space or attic chase, extent of mold remediation needed before sealing, and whether we’re repairing three joints or thirty. Heat pump homes in Beaverton often need more extensive work because the system’s year-round use has compounded damage. We provide exact, itemized quotes before starting — estimates are free, and there’s no obligation. Call (877) 335-1974 to schedule.
We Also Serve Cities Near Beaverton
Our service radius covers Cedar Hills, Raleigh Hills, West Haven, and West Haven-Sylvan — all sharing Beaverton’s Tualatin Valley climate and much of the same 1980s–1990s housing stock. Whether you’re in a Raleigh Hills split-level with sagging flex duct or a West Haven-Sylvan home needing comprehensive air leak repair, we bring the same owner-led approach and professional-grade Rotobrush and Nikro systems to every job.
Serving Beaverton, OR — Our Local Coverage Area
We’re based in the Beaverton 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 Beaverton
Continuous operation circulates air 12 months a year instead of 6–7, accelerating flex duct wear and distributing moisture and contaminants through the entire system. Beaverton’s heat pump homes — especially on Cooper Mountain and Sexton Mountain — experience this degradation pattern far more severely than furnace-only homes. Sealing leaks and repairing damaged runs reduces the workload on your heat pump, often cutting runtime noticeably. Call (877) 335-1974 for a free duct assessment — we’ll show you exactly where your system is losing efficiency.
Repair is viable if tears are localized, sags are moderate, and the duct interior hasn’t developed extensive mold colonization; replacement becomes the better investment when multiple runs show degradation, insulation is saturated, or mold remediation would cost more than new material. In Beaverton’s damp crawl spaces, we find the break-even point typically falls around 40–50% of runs damaged. We’ll give you an honest assessment — Richard Anderson evaluates every system personally. Call (877) 335-1974 for an exact recommendation and free estimate.
Mastic sealing prevents mold by stopping moisture-laden crawl space air from entering the duct system through leaks, but it must be paired with proper insulation and vapor barrier management for full protection. In Beaverton’s October-to-May humid season, we’ve found mastic-sealed systems with fresh insulation show dramatically lower mold recurrence than tape-sealed or unsealed ducts. The sealant itself is mold-resistant once cured. For a complete moisture-control evaluation of your Beaverton home, call (877) 335-1974 — estimates are free.
Yes, if the disconnection is at a joint and the surrounding duct material is still structurally sound; we reconnect with mechanical fasteners and seal with mastic, then test airflow to confirm. Beaverton’s 1980s–1990s tract homes often have one or two failed joints while adjacent runs remain usable. We only recommend full replacement when the material itself has degraded. Call (877) 335-1974 — we’ll crawl the space, photograph what we find, and explain your options with exact pricing.
Spring and early fall offer the most comfortable crawl space working conditions and the shortest scheduling windows before peak HVAC season demand. That said, we repair ducts year-round in Beaverton — winter emergencies like completely disconnected heating runs take priority. If you’re noticing symptoms now, waiting typically makes the damage more extensive and expensive. Call (877) 335-1974 to book; we’ll find a time that works and give you upfront pricing before we start.
Written by Richard Anderson, Owner and Lead Technician at Landmark Air Duct Cleaning Service Washington, serving Beaverton and the greater Portland metro area since 2013.