Fast, Reliable Duct Repair & Sealing Across Five Corners
Duct repair and sealing in Five Corners typically costs $280–$750 depending on whether you’re dealing with sagging flex-duct in a crawl space or a crushed section in a detached workshop, and most jobs are completed in a single visit. We’re our Duct Repair & Sealing team at Landmark Air Duct Cleaning Service Washington, and we know the 98662 area well — from the ranch tracts off NE 119th Street to the acreage properties with outbuildings that standard duct crews underestimate. If you’re seeing uneven heating, musty air when the furnace kicks on, or your workshop heater barely pushes air, call us at (877) 335-1974 for a free estimate. Richard Anderson, our Owner and Lead Technician, personally oversees every Five Corners job, so the person quoting your repair is the same one running the equipment.
Why Landmark Air Duct Cleaning Service Washington Is Five Corners’s Preferred Duct Repair & Sealing Company
We’ve been driving to Five Corners for 11 years, and the pattern is consistent: homes built during Clark County’s 1980s boom need more than a quick tape patch. Our 732 verified reviews averaging 4.9 stars include dozens from Five Corners homeowners who specifically mention our crawl-space work and workshop repairs. Richard Anderson doesn’t delegate to rotating crews — he’s owner-led on every job, which matters when you’re crawling through a damp 98662 crawl space at 8 a.m. to trace a sagging flex-duct run.
Our response time to Five Corners is typically same-day or next-morning, and we stock professional-grade materials — mastic sealant, reinforced flex-duct, galvanized metal sections — so we’re not making a second trip because we guessed wrong on parts. That one-trip completeness is especially important here. Many Five Corners properties sit on long gravel drives off NE 119th or NE 72nd Avenue; nobody wants to burn a morning waiting for a return visit because the crew brought residential-grade materials for a heavy-duty workshop application.
Our Duct Repair & Sealing Services in Five Corners
Duct Sealing
Sealing in Five Corners means dealing with two realities: original duct systems pushing 40 years old, and a wet-season heating cycle that turns every leak into a moisture injection point. We use mastic sealant on metal joints and high-temperature mastic on furnace plenums — not foil tape, which degrades in damp crawl spaces within a few seasons. A typical duct sealing job in a 1,800-square-foot Five Corners ranch runs $280–$450 and takes three to four hours.
Flex Duct Repair
This is where we spend most of our time in 98662. The 1970s–1990s tract homes here were built with flex-duct runs strung through unconditioned crawl spaces, and decades of Pacific Northwest moisture have sagged the insulation, collapsed the wire helix, and pooled debris at low points. We replace collapsed sections with new R-8 insulated flex-duct, support it with proper strapping every four feet, and seal connections with mastic — not zip ties and hope. Flex duct repair in Five Corners typically runs $180–$340 per section, with most homes needing two to four sections.
Metal Duct Repair
Metal ductwork in Five Corners shows up in two places: original furnace trunks in older ranches, and detached workshops where property owners have added forced-air heating. We tackled a duct repair on NE 119th Street where a five-acre property’s workshop had a 14-foot metal duct that collapsed under the weight of a heavy-duty garage door opener. We replaced the sagged section with reinforced galvanized steel, sealed with mastic, and added cross-bracing — no callbacks. Metal duct repair runs $320–$580 depending on gauge and access.
Duct Insulation
Uninsulated or degraded duct insulation in a Five Corners crawl space is throwing 15–25% of your heat into the dirt. We wrap exposed metal trunks and replace wet flex-duct insulation with R-8 or R-6 fiberglass wrap, sealed at seams. This is especially critical for workshop supply lines that run through unconditioned attics or crawl spaces before reaching the building. Duct insulation in Five Corners runs $2.50–$4.00 per linear foot.
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 Five Corners
We repair and seal duct systems connected to Honeywell and Aprilaire air quality equipment, and we stock Abatement Technologies HEPA accessories for properties that need post-repair air scrubbing. Our Rotobrush and Nikro cleaning systems come off the truck before sealing work begins — we don’t seal over contamination. For Five Corners homeowners dealing with wildfire smoke infiltration (increasingly common during August Columbia Gorge wind events), we can spec Guardsman-compatible seal upgrades on return-air plenums. Parts are stocked locally; most repairs don’t wait on shipping.
Common Duct Repair & Sealing Problems We See in Five Corners Homes
- Sagging flex-duct low points collecting moisture and mold. The combination of 40-year-old unsupported flex duct and persistently damp Clark County crawl spaces creates pooled water at duct bellies — a failure mode we see weekly in 98662 ranches, and one that’s far less common in drier Portland suburbs just across the Columbia.
- Detached workshop ducts crushed by heavy-duty door systems. Five Corners acreage properties often have 12- to 16-foot roll-up doors with heavy spring and opener hardware that vibrates and impacts overhead duct runs. Standard residential repairs fail; we spec reinforced metal with cross-bracing.
- Long service drives demanding one-trip completeness. Properties off NE 119th Street or deeper on gravel access roads don’t suit multi-visit repairs. We diagnose thoroughly, stock for the full scope, and finish in one trip.
- Wildfire smoke infiltration through unsealed return-air gaps. Late-summer Columbia Gorge wind events push fine ash from eastern Oregon directly into duct systems with leaky plenum connections, compounding the winter mold cycle with a second contamination season.
Pricing for Duct Repair & Sealing in Five Corners, WA
| Service | Typical Range in Five Corners | Most Common Job Size |
|---|---|---|
| Basic duct sealing (mastic, metal joints) | $280–$450 | Single furnace, ranch or split-level |
| Flex duct repair (per section) | $180–$340 | 2–4 sections per home |
| Metal duct repair/replacement | $320–$580 | Workshop or furnace trunk section |
| Duct insulation (per linear foot) | $2.50–$4.00 | 30–80 feet typical |
| Full system assessment + sealing | $450–$750 | Older home with multiple failure points |
What moves you within these ranges? Access difficulty (tight crawl spaces take longer), material gauge (workshop metal costs more than residential flex), and whether we’re cleaning before sealing (recommended — sealing over mold is a waste). We don’t quote over the phone for crawl-space work; Richard Anderson inspects in person, shows you the damage, and gives an upfront number before starting. Estimates are free. Call (877) 335-1974 to schedule.
We Also Serve Cities Near Five Corners
We regularly cross into Barberton for ranch-home crawl-space repairs, Walnut Grove for newer construction duct sealing, Mount Vista for acreage workshop systems, and Salmon Creek for split-level flex-duct replacement. Same owner-led service, same stocked trucks, same single-trip standard.
Serving Five Corners, WA — Our Local Coverage Area
We’re based in the Five Corners 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 Five Corners
We cut out the sagging belly, install new R-8 flex-duct with proper slope and support strapping every four feet, and seal connections with mastic. In Five Corners’s damp crawl spaces, we also check for groundwater intrusion that could re-sag the repair — we’ll tell you if drainage work is needed before we seal. Call (877) 335-1974 for an inspection; estimates are free.
No — standard residential materials won’t handle the vibration and clearance issues of heavy-duty door hardware. We spec reinforced galvanized metal duct with cross-bracing and mastic-sealed joints rated for workshop conditions. Richard Anderson measures door travel and opener weight on site to size the right gauge. Call (877) 335-1974 to schedule a workshop assessment.
Mastic survives the damp Clark County crawl space environment that destroys foil tape in two to three seasons. We’ve pulled off failed tape jobs in 98662 homes where the adhesive turned to slime — mastic hardens into a permanent, flexible seal. The upfront cost is slightly higher; the lifecycle cost isn’t close. Call (877) 335-1974 and we’ll show you the difference on your own joints.
Yes — we cut necessary access openings and patch them properly afterward. The 1970s–1990s Five Corners tracts were built with minimal access; we’ve worked in 18-inch crawl spaces where the only approach is belly-crawling to the furnace trunk. Richard Anderson evaluates access before quoting so you’re not surprised by additional cuts. Call (877) 335-1974 for a realistic access assessment.
We can isolate and replace the crushed section, but we also inspect the full run because impact damage often loosens downstream connections. Our NE 119th Street repair — the 14-foot metal duct crushed by a heavy-duty opener — was a section replacement, but we found two additional loose joints during inspection and sealed them before leaving. Call (877) 335-1974 for a full-scope quote; estimates are free.
Written by Richard Anderson, Owner and Lead Technician at Landmark Air Duct Cleaning Service Washington, serving Five Corners and Clark County since 2014.