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 Marietta
Duct repair and sealing in Marietta typically runs $280-$850 for most residential jobs, with flex duct replacement in East Cobb attic cavities landing at the higher end due to access difficulty. Our crews are dispatched from our Atlanta office and serve Marietta daily - we know the difference between a 1960s ranch near the historic square and a 1994 colonial off Shallowford Road, and we stock the right materials for both. Call (470) 495-9370 for a written estimate before any work starts.
Why CleanRun Air Duct Cleaning Atlanta Is Marietta’s Preferred Duct Repair & Sealing Company
We’ve served Marietta homeowners since 2013, and our Marietta jobs now number in the thousands. Every one of those jobs started with a written price delivered before a single panel came off - Haven Standard Clause 1 - and ended with a Documented Photo Record of every duct run, before and after, delivered to the customer as a standard job record.
Our technicians are background-checked, uniformed, and identified by name before arrival - Haven Standard Clause 3: Verified Crews. They operate under the full H.A.V.E.N. Standard, and our license number is published on this page, not buried in a footer. The 365-Day Done Right Promise backs every job in writing: if it’s not right, we make it right.
We answer calls with a live person, 24/7. No automated queue. No “press 1 for service.” When you schedule in Marietta, you’re talking to someone who knows that East Cobb traffic on Johnson Ferry moves differently at 3 PM than at 8 AM, and plans accordingly.
Our Duct Repair & Sealing Services in Marietta
Duct Sealing
Sealing in Marietta isn’t about comfort alone - it’s about keeping 130°F attic air and Georgia-pine pollen out of your living space. We use mastic sealant and mechanical fasteners on every joint, collar, and plenum connection, then pressure-test the system to verify the seal. In Marietta’s humid subtropical climate, an unsealed return in an East Cobb attic is actively pulling mold-friendly moisture into the system every time the blower cycles. Our Duct Repair & Sealing team documents every sealed joint with before-and-after photos.
Flex Duct Repair
This is where Marietta’s housing stock gets specific. East Cobb’s early-1990s builder-grade flex duct was commonly routed through cathedral-ceiling cavities and attic knee walls where Marietta attic temps top 130°F in summer - heat cycling that cracks the inner Mylar liner and sheds fibrous particulate into the airstream, a failure Marietta techs spot on sight but homeowners almost never suspect. That means sealing and repair work here often starts with a camera inspection of the liner itself, not just the visible joints. We replace compromised flex runs with new insulated duct, properly supported and sealed, and we photograph the liner condition before we quote anything.
Metal Duct Repair
The 1950s-1970s ranch and split-level homes near Marietta’s historic downtown square often have original galvanized steel ductwork. Decades of vibration have loosened seams and corroded sections where condensation collects. We repair with sheet-metal patches, drive-screw mechanical fastening, and mastic sealant - not duct tape, which fails in Marietta’s humidity within two seasons. When metal duct is too far gone, we section-replace with new galvanized or transition to modern flex where appropriate, always documenting the scope in writing before work begins.
Duct Insulation
Unconditioned attic ducts in Marietta lose massive efficiency to radiant heat gain. We install closed-cell foam insulation wraps and reflective barriers on accessible duct runs, with particular attention to the long flex-duct spans in East Cobb’s two-story builds. Proper insulation also prevents the condensation that leads to mold colonization - a real problem in Marietta’s May-through-September cooling season when attic humidity meets cold supply air.
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.
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Our equipment roster includes Rotobrush rotary brush systems for mechanical agitation inside duct runs, Nikro negative-pressure extractors for debris removal, and Honeywell and Aprilaire air quality components for post-repair balancing. We stock common flex-duct diameters, collar sizes, and mastic compounds locally, so Marietta jobs don’t wait on parts. Every brand we name can be verified independently - we don’t use equipment we can’t document.
Common Duct Repair & Sealing Problems We See in Marietta Homes
- Cracked Mylar liners in East Cobb flex duct. The 130°F attic heat cycling in Marietta’s summer cracks the inner liner of 1990s-era flex duct, shedding white fibrous dust through registers. Homeowners often mistake it for construction dust or dirty filters. A camera inspection reveals the actual failure.
- New-construction handover debris. Marietta’s building boom has left drywall dust, sawdust, and trim shavings sitting in ducts of homes sold as “move-in ready.” The builder’s rough clean rarely reaches past the main trunk, so debris circulates for months until a repair opening exposes it.
- Mold colonization at unsealed joints. Marietta’s sustained summer humidity finds any minor leak or insulation gap and colonizes the duct section. We see this most often on return ducts in crawl spaces and knee walls where a single unsealed collar pulls in damp crawl-space air.
- Disconnected collars at the air handler. Vibration and thermal expansion loosen the connection between the plenum and the air handler unit, particularly in homes near Canton Road with heavy truck traffic. The system pulls unconditioned attic air, spiking energy bills and introducing contaminants.
Pricing for Duct Repair & Sealing in Marietta, GA
A typical mastic sealing job for a Marietta home with 8-12 supply runs runs $280-$450. Flex duct replacement in an East Cobb attic cavity, where access requires navigating cathedral-ceiling joist bays, typically lands at $380-$650 per run. Full metal duct section repair near the historic square, including patch fabrication and seam sealing, ranges $420-$850 depending on accessibility and extent.
What moves the number: attic access difficulty (knee walls and cathedral cavities add labor), number of compromised runs, and whether the repair opening reveals secondary damage like mold or rodent intrusion. We deliver a written price before any work starts - Haven Standard Clause 1 - and our Free Second Opinion policy means you can bring any competitor’s written estimate; we’ll put our number next to it at no cost.
Call (470) 495-9370 for a written estimate. Estimates are free.
We Also Serve Cities Near Marietta
Our crews work daily in Smyrna, Kennesaw, Powder Springs, and Atlanta - the same documented process, the same written pricing, the same 365-Day Done Right Promise. Dispatch and scheduling are coordinated from our Atlanta office; crews serve Marietta locally.
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
Because builders’ rough cleans rarely remove drywall dust, sawdust, and trim shavings from the duct runs. In Marietta’s new subdivisions, we’ve opened supply registers to find compacted construction debris blocking 30% of the airflow - debris the homeowner was breathing for months. We recommend a camera inspection before your one-year builder warranty expires, so any duct damage from construction traffic is documented. Call (470) 495-9370 to schedule - estimates are free.
White fibrous dust puffing from supply registers is the tell, but homeowners often blame dirty filters or outdoor pollen first. The only certain check is a camera inspection through the return plenum - we look for the spiderweb cracking pattern on the Mylar liner that Marietta techs recognize immediately. If we find it, we show you the photo before quoting replacement. Call (470) 495-9370 to book a camera inspection.
Yes - more here than in drier climates. An unsealed return duct in a 130°F Marietta attic is pulling superheated, pollen-laden air into your system every cycle, forcing your AC to run longer and harder. Sealed ducts reduce cooling load and keep contaminants out. We pressure-test every seal and document the before-and-after leakage rate in your job record. Call (470) 495-9370 for a written sealing quote.
Sealing addresses intact ductwork with leaks at joints, collars, and seams - we apply mastic sealant and mechanical fasteners, then verify with pressure testing. Repair addresses physical damage: cracked flex liners, corroded metal sections, disconnected collars, or collapsed runs. In Marietta’s East Cobb homes, we often find both - the heat-cycled liner cracks (repair), and the original builder’s tape seals have failed (sealing). We assess with a camera and quote each scope separately in writing. Call (470) 495-9370 for an assessment.
Cleaning removes accumulated pollen and debris, but sealing keeps new pollen from entering through leaks. In Marietta, where oak and Georgia-pine pollen loads are among the highest in the metro, the two services work together: cleaning addresses what’s inside, sealing addresses what’s getting in. We often recommend both, quoted separately, with photos of the leakage points so you can decide. Call (470) 495-9370 for a combined assessment and written pricing.
We were called to a two-story colonial off Oak Lane in East Cobb where the homeowners had just bought a 1991 build and every supply register was puffing white dust. Our tech ran a camera inspection through the return plenum and found the original flex duct in the cathedral-ceiling cavity had a cracked Mylar liner shedding fibrous particulate, plus a disconnected collar at the air handler pulling attic air. We reconnected and mastic-sealed the collar, replaced the compromised flex run, and source-removed the construction debris with negative pressure and HEPA filtration - the register dust stopped that day. The homeowners received a Documented Photo Record of every run, before and after, and a written 365-Day Done Right Promise.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Atlanta, serving Marietta since 2013.