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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Before
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Before
AfterFast, Reliable Duct Repair & Sealing Across Marietta
Duct repair and sealing in Marietta typically runs $450-$1,800 depending on whether we’re reconnecting a single crushed flex run or resealing an entire system, and most jobs are scheduled within a few business days with a written price delivered before any work starts. Our crews serve Marietta from our Atlanta dispatch office, carrying Rotobrush and Nikro equipment, Honeywell airflow meters, and Aprilaire testing gear on every truck. Call (678) 679-7540 for a free estimate - estimates include a camera inspection of your duct runs so we can show you exactly what we’ve found before quoting a dollar figure.
Why CleanRun Air Duct Cleaning Alpharetta Is Marietta’s Preferred Duct Repair & Sealing Company
We’ve been in Marietta homes since 2013, and the pattern is consistent: original flex duct from the 1980s and 1990s, degraded by attic heat, sagging at low points, and leaking conditioned air into spaces that don’t need cooling. Our Duct Repair & Sealing team documents every finding with before-and-after photos of each duct run - not marketing shots, but deliverables you receive as part of the standard job record.
Our technicians are background-checked and uniformed under Haven Standard Clause 3: Verified Crews, and every job carries the 365-Day Done Right Promise in writing. We publish our license number on every page because credentials should be verifiable, not buried in a footer. Scheduling is coordinated from our Atlanta office, and crews carry parts for same-visit repairs on most common Marietta systems.
Our Duct Repair & Sealing Services in Marietta
Duct Sealing with Mastic Sealant
Mastic sealant is the standard we apply to every joint, boot, and collar in Marietta homes - not foil tape, which degrades in attic heat within a few seasons. A typical mastic sealing job for a 1,500-2,500 square foot Marietta ranch runs $450-$850. We brush on water-based mastic, allow full cure time, and pressure-test the system before we leave. In East Cobb’s older subdivisions, we frequently find original builders used tape only at plenum connections; after 30 years, that tape has turned to powder and the system is leaking 20-30% of its airflow into the attic.
Flex Duct Repair
Flex duct repair is the core of our Marietta work. Cobb County’s 1975-1995 build-out left thousands of homes with flexible fiberglass runs in unconditioned attics that now sag, crush at support points, or disconnect entirely at collars. Repairing a single crushed or disconnected flex run typically costs $280-$550; replacing a full system runs $1,200-$1,800 for most Marietta ranches. We source-match the original diameter, reconnect with mechanical fasteners (not tape), mastic-seal every joint, and re-support with proper strapping to prevent future sag.
Metal Duct Repair
Some Marietta homes - particularly those built in the 1960s and early 1970s before flex duct dominated - have galvanized steel trunk lines with stamped-branch takeoffs. We repair separated seams, replace rusted sections, and seal with mastic rated for metal substrates. Metal duct repair in Marietta typically falls between $350-$750 depending on accessibility and the extent of corrosion. These systems often show condensation damage at seams where attic humidity meets cooled air - a pattern we see frequently in homes near Kennesaw Mountain’s elevated humidity zone.
Duct Insulation and Re-Wrap
When flex duct insulation has absorbed moisture or been colonized by mold, surface cleaning isn’t enough. We remove the degraded wrap, treat the inner liner if salvageable, and re-insulate with fresh fiberglass wrap sealed with vapor-barrier jacket. Duct insulation work in Marietta runs $400-$900 for partial re-wrap, $1,100-$1,800 for full system replacement. This is often the real fix for the musty smell that hits when the AC cycles on - the odor isn’t dirty ducts, it’s mold metabolites in wet insulation.
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.
Before
AfterTrusted Brands We Service in Marietta
Our trucks carry professional-grade equipment from Nikro, Honeywell, Aprilaire, and Abatement Technologies - brands you can look up independently before we arrive. We stock common flex duct diameters, mastic compounds, and insulation wraps for Marietta’s predominant housing stock, which means most repairs don’t wait on parts orders. For specialized components, our Atlanta office coordinates next-day delivery from regional distributors serving Cobb County.
Common Duct Repair & Sealing Problems We See in Marietta Homes
- Crushed flex runs at attic support points. Original 1980s flex duct in Marietta’s unconditioned attics degrades from 130-140°F summer heat, causing inner-liner breakdown and debris collection at low points that restricts airflow to back bedrooms. The camera shows a 3-inch debris build-up at the first elbow, and the register in the back bedroom barely moves a tissue.
- Disconnected collars dumping air into the attic. Georgia red-clay dust and compacted pollen mats pack against return-air grilles in hallway ceilings after 30+ years of no professional cleaning, so the system recirculates biological particulate instead of filtering it. Meanwhile, the disconnected supply run has been heating a 140°F attic for years without the homeowner knowing.
- Condensation-fed mold in insulation wrap. Condensation at duct joints - driven by humid subtropical cooling seasons that run 6+ months and attic-to-indoor temperature differentials - feeds mold colonization inside the insulation wrap that spreads into living space with each blower cycle. The register itself looks clean; the problem is six inches upstream.
- Tape-only sealing turned to powder. Builders in the 1980s and 1990s often used foil tape as a primary sealant at plenum connections. After three decades of Marietta attic heat, that adhesive has crystallized and the joints are leaking 20-30% of conditioned air. Mastic is the only repair that lasts.
Pricing for Duct Repair & Sealing in Marietta, GA
| Service | Typical Range in Marietta |
|---|---|
| Mastic sealing (partial system) | $450 - $850 |
| Single flex duct repair/reconnect | $280 - $550 |
| Metal duct seam repair | $350 - $750 |
| Duct insulation re-wrap (partial) | $400 - $900 |
| Full flex duct replacement | $1,200 - $1,800 |
| Full system insulation re-wrap | $1,100 - $1,800 |
These ranges reflect Marietta’s market - Cobb County labor rates, the predominance of attic-access ranch and two-story homes, and the condition of 30-50-year-old original systems. Every estimate starts with a camera inspection and ends with a written price before any work begins, per Haven Standard Clause 1. No per-vent pricing. No coupon bait. Call (678) 679-7540 for your exact number - estimates are free.
We Also Serve Cities Near Marietta
Our crews work throughout Cobb and north Fulton counties, including Duct Repair & Sealing in Marietta and surrounding communities: Smyrna to the south, Kennesaw to the northwest, Woodstock to the north, and Roswell across the Fulton line. Scheduling is coordinated from our Atlanta office with route efficiency for same-day or next-day appointments across this service area.
Serving Marietta, GA - Our Local Coverage Area
We’re based in the Marietta 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 Marietta
Repair is often possible and more cost-effective than full replacement. We run a camera through every duct run to assess inner-liner condition; if the liner is intact but the insulation is degraded or the run has sagged, we can reconnect, re-support, and re-wrap for 40-60% less than full replacement. In the Lassiter school district of East Cobb, our crew ran a camera inspection on a 1986 two-story and found a crushed flex run off the air handler that had been disconnected at the collar for years, dumping conditioned air into a 140°F attic. After source removal with a Rotobrush and negative pressure, we reconnected the run, mastic-sealed every boot and collar, and re-insulated the sagging spans - the hallway registers finally read even airflow for the first time in decades. Call (678) 679-7540 for a camera inspection and written repair estimate.
The smell is almost always mold metabolites in wet duct insulation, not surface dust in the duct itself. Marietta’s humid subtropical climate means your cooling system runs 6+ months annually, and the temperature differential between your 55°F supply air and 130°F attic air creates condensation at duct joints. That moisture feeds mold inside the insulation wrap, and every blower cycle pushes the odor through clean-looking registers. Surface cleaning won’t fix it; the insulation needs removal and replacement. Typical duct insulation re-wrap in Marietta runs $400-$900 for partial work. Call (678) 679-7540 for a camera inspection that shows you exactly where the moisture damage is.
It helps significantly, but not in the way most homeowners expect. Duct sealing doesn’t filter pollen; it prevents your return ductwork from pulling unfiltered attic air into the system. In Marietta, where Atlanta’s spring tree pollen regularly exceeds 10,000 particles per cubic meter and Cobb County’s oak-and-pine canopy amplifies this locally, a leaky return plenum is essentially a direct injection of pollen into your living space. Sealing those leaks means all return air passes through your HVAC filter as designed. Mastic sealing a typical Marietta system runs $450-$850. Call (678) 679-7540 for a pressure test that quantifies your leakage.
We measure it. Our crews use Honeywell digital manometers and Aprilaire airflow meters to compare supply and return volumes against system design specs; a significant differential indicates leakage. We also pressurize the duct system and measure static pressure loss over time. For Marietta homeowners, we include this testing in every free estimate - no guesswork, no “your ducts probably leak.” You’ll see the numbers in writing before we quote any repair. Call (678) 679-7540 to schedule testing.
Yes. Our repair and sealing protocols exceed NADCA Assessment, Cleaning, and Restoration (ACR) standards, and we document compliance in the written job record you receive. For Marietta’s older housing stock - particularly the 1975-1995 flex-duct inventory - NADCA’s guidance on mechanical repair versus replacement is especially relevant; we follow their decision matrix for liner condition, support integrity, and insulation state. Every job includes the documented photo record, written scope, and 365-Day Done Right Promise. Call (678) 679-7540 for a free second opinion on any competitor’s written estimate.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Alpharetta, serving Marietta since 2013.