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 Ashburn
Duct repair and sealing in Ashburn typically costs $280-$650 for most residential jobs, with full-system flex duct replacement running $1,200-$2,400 depending on home size and attic accessibility. We dispatch crews to Ashburn from our Washington, DC office, and most scheduled repairs are completed in a single visit with the written price agreed before any panel comes off.
We’ve worked in Ashburn since 2013, and the housing stock here tells a consistent story. The planned communities that filled Loudoun County between 1995 and 2010 - Broadlands, Brambleton, Ashburn Farm - are now hitting the 20-30 year mark. That’s the age when original flex ductwork accumulates enough debris and degradation to demand real attention, not just a vacuum wand waved at a register. Our Duct Repair & Sealing team knows these homes. We know where the NV Homes and Pulte builds of the late 1990s tucked their return plenums, and we know what we’ll find inside them.
Call (571) 520-6317 for a free written estimate. Estimates include a camera inspection of your duct system and a documented photo record of what we find.
Why CleanRun Air Duct Cleaning Herndon Is Ashburn’s Preferred Duct Repair & Sealing Company
Our reputation in Ashburn is built on documentation, not promises. Every job starts with a written price under Haven Standard Clause 1, and every job ends with a Documented Photo Record showing the inside of every duct run before and after work. Homeowners in Broadlands and Brambleton have left us reviews specifically citing this practice - the ability to see what was actually done, not just hear about it.
We don’t quote per-vent pricing or $79 teaser rates. Ashburn homes average 3,000-5,000+ square feet with dual- or triple-zone HVAC systems and extensive flex duct runs through unconditioned attics. A job this complex demands a whole-system price agreed upfront, not a number that doubles once the crew is on site. Our Free Second Opinion on Any Written Estimate means you can bring us a competitor’s quote and we’ll put our number next to it in writing, no charge.
Response time to Ashburn is typically next-day or within 48 hours for non-emergency repairs. Scheduling is coordinated from our Washington, DC office, with crews carrying Rotobrush, Nikro, and Abatement Technologies equipment on every truck. Technicians are background-checked, uniformed, and identified by name before arrival under Haven Standard Clause 3: Verified Crews.
Our Duct Repair & Sealing Services in Ashburn
Flex Duct Repair
Ashburn’s 1990s and 2000s colonials rely heavily on flex duct - flexible, insulated ductwork that snakes through unconditioned attics to reach second and third floors. Over 20-30 years, the wire helix supporting these ducts fatigues, causing sagging that traps condensation against the interior liner. Northern Virginia’s humid summers, with dewpoints regularly in the low-to-mid 70s°F, accelerate this failure mode. We replace damaged flex sections with new, properly-supported runs, reconnecting at the plenum with mechanical fasteners and sealing with mastic, not tape that will fail in three years.
Duct Sealing
Leaky ducts in Ashburn homes waste 20-30% of conditioned air on average, according to Department of Energy estimates we’ve verified in local testing. The problem is especially acute in homes with long flex runs through hot attics - the pressure differential between conditioned space and attic pulls unconditioned air into leaks at elbows and joints. Our sealing process pressurizes the system to identify leaks, then seals accessible joints with mastic sealant (a thick, fiber-reinforced compound that remains flexible for decades) and replaces inaccessible damaged sections. The result is measurable: we test static pressure before and after, and the numbers go in your job record.
Metal Duct Repair
While flex dominates Ashburn’s residential stock, some homes - particularly Toll Brothers builds in Brambleton and custom construction near Belmont Ridge Road - use galvanized metal ductwork for main trunks. Metal ducts don’t sag, but they corrode at seams and can separate at slip joints. We repair metal duct with proper sheet metal patches, sealed with mastic and secured with sheet metal screws, not duct tape. Where rust has compromised the duct wall, we replace the section.
Duct Insulation
Unconditioned attics in Ashburn routinely reach 140°F in July. Duct insulation degrades over time, especially where flex duct outer jackets have been disturbed by maintenance activity. We replace damaged insulation with new R-6 or R-8 insulation (matching or exceeding original specifications) and vapor-barrier jacketing, paying particular attention to return ducts that operate under negative pressure and can pull hot attic air through even small insulation gaps.
Mastic Sealant Application
Mastic is the standard for durable duct sealing, and we apply it on nearly every Ashburn job. Unlike foil tape, which degrades with temperature cycling, mastic remains flexible and airtight through decades of attic temperature swings. We brush-apply mastic to all accessible joints after mechanical fastening, with a typical residential system requiring 2-4 gallons for complete sealing. The work is slow and methodical. It has to be.
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 Ashburn
Our trucks carry professional-grade equipment from trade-recognized brands: Rotobrush mechanical agitation systems, Nikro negative-pressure extractors, and Abatement Technologies HEPA filtration units. We stock common flex duct diameters, mastic, and mechanical fasteners specifically sized for the residential systems common in Ashburn’s 1990s-2000s housing stock. This means most repairs don’t wait on parts orders. For air quality components integrated with duct systems - Honeywell, Aprilaire, and Guardsman media filters and UV sanitizers - we service what you have and can recommend upgrades where the existing equipment is undersized for Ashburn’s pollen loads.
Common Duct Repair & Sealing Problems We See in Ashburn Homes
- Sagging flex duct with condensation damage. In Broadlands and Brambleton colonials, we regularly open attics to find flex duct runs that have sagged between supports, creating low points where condensation pools during humid summer months. The interior liner delaminates, and microbial growth follows. We replace the damaged section and re-support the run with proper strapping at 4-foot intervals.
- Original post-construction debris in return plenums. In Broadlands and Brambleton colonials built during the late-1990s construction rush, it’s common to open return plenums and find original post-construction drywall dust and fiberglass insulation fragments still packed into flex duct elbows - debris that was never cleaned out at project completion and has been recirculating through the home’s air for over two decades. This material restricts airflow and acts as a reservoir for particles that cycle through living spaces every time the blower runs.
- Disconnected joints at plenum connections. Dual- and triple-zone systems with multiple air handlers create complex duct networks with numerous joints. Thermal expansion and contraction, combined with vibration from air handlers mounted in attics, loosen connections over 20+ years. We find disconnected elbows leaking conditioned air into attics, sometimes blowing directly against insulation where homeowners never see the problem.
- Rural properties with accelerated loading from unpaved roads and wood heat. Properties on the edges of Ashburn’s developed core - near routes like Waxpool Road and Loudoun County Parkway extensions - face dust and pollen loading from unpaved access roads and open agricultural land. Homes with supplemental or primary wood heat introduce additional particulate matter and require more frequent duct maintenance. The cleaning interval for these properties runs 2-3 years for wood-heat homes and 3-5 years for properties near unpaved roads, shorter than the 5-7 year standard for filtered suburban homes on paved streets.
Pricing for Duct Repair & Sealing in Ashburn, VA
We publish ranges because Haven Standard Clause 1 requires a written price before work starts - and that price should be grounded in actual local market data, not a number pulled from thin air.
| Service | Typical Range in Ashburn |
|---|---|
| Duct sealing (whole system, mastic) | $280 - $450 |
| Flex duct repair (single run replacement) | $180 - $340 |
| Flex duct repair (multiple runs, attic) | $450 - $850 |
| Metal duct repair (patch/seam) | $220 - $380 |
| Duct insulation replacement | $320 - $580 |
| Full system flex duct replacement | $1,200 - $2,400 |
What moves a job within these ranges: attic accessibility (blown insulation adds time), number of air handlers and zones, extent of damage found during camera inspection, and whether repairs require moving the air handler platform. Every estimate includes the camera inspection and written scope at no charge. We don’t charge to look.
Call (571) 520-6317 for your written estimate. We’ll inspect your system, photograph what we find, and deliver a price you can compare - with our Free Second Opinion guarantee if you already have another quote in hand.
We Also Serve Cities Near Ashburn
Our crews work throughout Loudoun and Fairfax Counties, with regular routes to Ashburn, Leesburg, Sterling, Herndon, and Chantilly. The same written pricing, documented photo record, and 365-Day Done Right Promise apply in every jurisdiction we serve.
Serving Ashburn, VA - Our Local Coverage Area
We’re based in the Ashburn 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 Ashburn
Every 3 to 5 years for homes near unpaved roads or active agricultural land, compared to 5 to 7 years for homes on paved streets with standard HVAC filtration. The dust loading from unpaved access roads and pollen from open fields cycles through duct systems faster than in fully developed neighborhoods. Properties with wood heat should schedule every 2 to 3 years due to additional particulate matter. Call (571) 520-6317 and we’ll assess your specific conditions during a free inspection.
Camera inspection of all accessible duct runs, replacement of damaged flex sections with properly-supported new material, reconnection of separated joints with mechanical fasteners and mastic sealant, and negative-pressure source removal of accumulated debris. For Ashburn’s 1990s-era homes, we typically find sagging runs, disconnected elbows at plenums, and post-construction debris packed into flex duct corners. The job concludes with before-and-after photography of every run and a written record of static pressure improvements. Call (571) 520-6317 for a written scope and price.
These homes are reaching the 20-30 year mark when original flex ductwork fatigues, mastic dries and cracks, and thermal cycling loosens connections. The concentration of same-vintage, similarly-constructed homes in planned communities like Broadlands, Brambleton, and Ashburn Farm creates a locally-specific demand wave - entire neighborhoods are experiencing similar failure modes simultaneously. Northern Virginia’s humid summers accelerate condensation damage in unconditioned attics. If your home was built in this window and you’ve never had ductwork inspected, a camera evaluation is warranted. Call (571) 520-6317 to schedule.
Yes, we repair and seal ductwork in detached garages, workshops, barn conversions, and guest houses throughout Ashburn’s rural fringe. These systems often use residential-grade equipment in non-residential applications, with longer duct runs and less frequent maintenance. We apply the same written pricing and documentation standards, though access conditions may affect scheduling. Call (571) 520-6317 to discuss your specific outbuilding setup.
Every 2 to 3 years for homes using wood as primary or significant supplemental heat. Wood combustion introduces fine particulate matter that bypasses standard HVAC filtration and accumulates in ductwork, particularly at elbows and in return plenums. Ashburn properties with wood stoves or fireplaces integrated into central duct systems show measurably higher debris loading in our camera inspections. More frequent cleaning protects both air quality and system efficiency. Call (571) 520-6317 for a free inspection and written maintenance recommendation.
We were called to a 4,200 sq ft colonial in Broadlands where the homeowner complained of dust streaking from the registers and a musty odor in the upstairs hallway. Using a camera inspection, we found the original flex duct runs sagging in the unconditioned attic, with visible condensation and microbial growth on the interior liner, plus a disconnected elbow at the return plenum that was leaking air into the attic. We reconnected and sealed the joint with mastic, replaced the damaged flex section, and performed source removal with negative pressure and HEPA filtration to clear the decades-old drywall dust and insulation fragments from the system. The photo record showed the homeowner exactly what had been circulating through their air for twenty years.
Every job we complete in Ashburn is backed by our 365-Day Done Right Promise: if the work is not right, we make it right, in writing, not subject to manager approval. The H.A.V.E.N. Standard governs everything we do, from background-checked crews to equipment verification to the documented deliverables you receive. We’ve held these standards since our first job in 2013, across 52,000+ homes served.
Call (571) 520-6317 for a free written estimate on duct repair and sealing in Ashburn. We’ll inspect your system, show you what we find, and deliver a price before any work begins.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Ashburn under the Haven Standard since 2013.