Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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AfterFast, Reliable Duct Repair & Sealing Across Falls Church
Duct repair and sealing in Falls Church typically costs $280-$750 for most homes, with full-system sealing running $1,200-$2,400 depending on accessibility and the extent of damage. Our Duct Repair & Sealing crews serve Falls Church from our Washington, DC dispatch office, and we schedule most jobs within 3-5 business days. Call (240) 771-1508 for a written estimate before any work starts.
We’ve worked inside enough Falls Church homes to know the patterns. The 1950s ranches off Roosevelt Street. The split-levels near East Falls Church with their original galvanized trunks. The in-fill townhomes along Route 7 where flex duct was connected in a hurry and left to fail. Every system tells a story, and we document it with photographs you can see before we quote a price.
Why CleanRun Air Duct Cleaning Ashburn Is Falls Church’s Preferred Duct Repair & Sealing Company
Since 2013, we’ve served more than 52,000 homes with one rule: written price first, then work. No exceptions. Falls Church homeowners find us because they’ve already met the $79-coupon companies, and they want something they can verify.
Our crews know the local housing stock. The mid-century ranch homes with slab-embedded ductwork near Roosevelt Street. The crawl-space galvanized trunks in the neighborhoods between Route 7 and Route 29. We don’t guess at what’s inside your walls; we run a camera first, show you the footage, and quote from what we see.
Haven Standard Clause 1 requires a written price before any panel comes off. Haven Standard Clause 3, Verified Crews, means our technicians are background-checked, uniformed, and identified by name before arrival. Tomas Reyes, our owner, established this protocol in 2013 and still reviews every documented photo record before it goes to the customer.
We also offer a Free Second Opinion on any written estimate. Bring us a competitor’s quote. We’ll put our number next to it, in writing, with no charge to compare.
Our Duct Repair & Sealing Services in Falls Church
Duct Sealing
Sealing is where most Falls Church homes see the fastest return. Original 1950s-60s sheet-metal joints were sealed with fabric tape that dries and separates after decades of humidity cycling. In the crawl spaces common to Falls Church ranch homes, this means conditioned air bleeds into unconditioned space year-round. We pressure-test the system to locate leaks, then seal with mastic sealant rated for the temperature swings these ducts see. A typical duct sealing job in Falls Church runs $280-$550 for partial-system work and $1,200-$2,400 for whole-house sealing.
Flex Duct Repair
The Route 7 and Route 29 in-fill boom of the 2010s-2020s left Falls Church with townhomes and mixed-use conversions where flex duct was run through shared plenum spaces with minimal support. Sagging, crushed, or disconnected flex is standard in these newer buildings. We replace damaged sections with properly supported flex duct, seal connections with mechanical fasteners and mastic, and photograph every joint before closing the ceiling. Flex duct repair in Falls Church typically costs $180-$420 per run.
Metal Duct Repair
Falls Church’s original galvanized steel trunks are now 60-70 years old. We’ve found separated joints, rust-through at low points where condensation pools, and sections crushed by later remodeling. Metal duct repair involves cutting out damaged sections, fabricating replacement pieces, and sealing with mastic sealant and mechanical fasteners. Where the original trunk is too far gone, we section in new galvanized or switch to insulated flex for crawl-space runs. Metal repair in Falls Church ranges from $340-$680 for localized work to $890-$1,500 for trunk replacement.
Duct Insulation
Uninsulated or degraded duct insulation in Falls Church crawl spaces and attics wastes energy and creates condensation problems. The DC metro’s humid summers, with July dew points regularly hitting 70°F, mean cold supply ducts in hot crawl spaces drip moisture onto framing and into insulation. We install R-6 or R-8 foil-faced insulation on all accessible runs, sealed at seams with mastic tape. Duct insulation in Falls Church typically runs $2.50-$4.20 per linear foot, with most homes falling in the $580-$1,200 range.
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.
BeforeAfterTrusted Brands We Service in Falls Church
Our equipment roster includes Rotobrush agitation systems, Abatement Technologies negative-pressure machines, and Guardsman antimicrobial treatments. For humidity control and filtration upgrades tied to sealing work, we install Aprilaire whole-home dehumidifiers and media filters. These are professional-grade tools you can look up independently, not proprietary equipment with unverifiable claims. We stock common flex duct, mastic sealant, and insulation materials for Falls Church jobs, which means most repairs don’t wait on parts.
Common Duct Repair & Sealing Problems We See in Falls Church Homes
- Galvanized trunk joints vibrating loose in crawl spaces. Original 1950s-60s sheet-metal ducts in Falls Church ranch homes were sealed with tape that hardens and fails after decades of blower vibration and humidity cycling. The gaps pull in crawl-space air, fiberglass insulation, and rodent debris, then distribute it through every register.
- Slab-embedded runs trapping moisture near Roosevelt Street. East Falls Church homes with 1960s ductwork embedded in or just above concrete slabs see condensation from summer storms with no drainage path. These inaccessible lower runs become mold incubators that recontaminate the system within a season of standard cleaning.
- Remodel debris flooding original ducts. Because Falls Church is hemmed in as Virginia’s smallest independent city, renovation pressure is relentless. Homeowners update kitchens and baths while leaving original sheet-metal trunks in place. Drywall dust, insulation fibers, and construction debris pour through disturbed joints into supply and return ducts.
- Failed flex connections in Route 7 in-fill townhomes. Fast build-outs left shared plenum spaces full of debris and flex duct connections unsupported. Registers blow dust long after closing, and sagging flex restricts airflow enough to trip high-limit switches on furnaces.
Pricing for Duct Repair & Sealing in Falls Church, VA
We quote every job in writing before work starts. No exceptions. Haven Standard Clause 1.
| Service | Typical Range in Falls Church |
|---|---|
| Duct sealing, partial system (mastic, leak test) | $280 - $550 |
| Duct sealing, whole house | $1,200 - $2,400 |
| Flex duct repair / replacement, per run | $180 - $420 |
| Metal duct repair, localized | $340 - $680 |
| Metal trunk replacement, section | $890 - $1,500 |
| Duct insulation (R-6/R-8), per linear foot | $2.50 - $4.20 |
| Full system: cleaning + sealing + insulation | $1,800 - $3,600 |
What moves the price: accessibility (crawl space vs. basement), extent of damage found during camera inspection, and whether the system needs antimicrobial treatment for mold. Every estimate includes the documented photo record, delivered as part of the standard job record. Call (240) 771-1508 for a written quote - estimates are free, and we provide a Free Second Opinion on any competitor’s written estimate.
We Also Serve Cities Near Falls Church
Our crews work throughout Northern Virginia, including Falls Church and neighboring Annandale, Vienna, Burke, and Fairfax. Scheduling is coordinated from our Washington, DC office, with local technicians dispatched to each area.
Serving Falls Church, VA - Our Local Coverage Area
We’re based in the Falls Church 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 Falls Church
Every 3-4 years for original sheet-metal systems in Falls Church, with sealing inspection every 2 years. The galvanized trunks in these homes develop joint separation and internal rust that vacuuming alone won’t address. We recommend a camera inspection at the 2-year mark to catch joint failures before they pull in crawl-space debris. Call (240) 771-1508 to schedule - estimates are free.
The musty smell likely comes from mold in slab-embedded or crawl-space duct runs that standard vacuuming cannot reach. Falls Church’s humid summers, with dew points hitting 70°F, create condensation inside uninsulated ducts that sit in or near concrete. Negative-pressure extraction with antimicrobial treatment, followed by sealing and insulation, is usually required to stop the cycle. A camera inspection will show whether moisture has penetrated the lower runs. Call (240) 771-1508 for a written diagnosis.
Yes. We replace crushed, sagging, or disconnected flex duct in these townhomes regularly. The build-out speed of the 2010s-2020s in-fill left many flex connections unsupported and shared plenum spaces full of construction debris. We install properly supported flex with mechanical fasteners and mastic sealant, then pressure-test the system. Typical flex repair in these units runs $180-$420 per run. Call (240) 771-1508 for a written quote.
Yes, significantly, when the dust source is the duct system itself. In Falls Church’s 1950s-60s homes, separated galvanized joints pull in crawl-space debris, insulation fibers, and rodent droppings. Sealing those joints with mastic sealant stops the infiltration. We verify with a before-and-after pressure test, and the documented photo record shows you exactly where the leaks were. Most homeowners notice reduced register dust within two weeks of sealing. Call (240) 771-1508 for a leak test and written estimate.
MERV 11-13 for the main house, with a dedicated MERV 8 pre-filter on any duct run serving a wood-heated outbuilding. Wood combustion produces fine particulate that loads filters faster than standard dust, and the higher MERV rating in the main house protects against pollen and remodel debris common in Falls Church’s churning housing stock. We inspect the blower motor’s capacity before recommending MERV 13, as dense filters can strain older systems. Call (240) 771-1508 to review your system’s specs.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Falls Church since 2013.