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 Decatur
Duct repair and sealing in Decatur, GA typically costs $340-$890 for most residential jobs, with full-system sealing and re-insulation in older crawl spaces running toward the higher end. We dispatch crews to Decatur from our Atlanta office daily, and most repair visits are scheduled within a week of your call. If you smell musty air from your registers or a back bedroom hasn’t cooled in years, the problem is usually not your HVAC unit-it’s the ductwork buried in your crawl space.
Call (678) 904-9744 to schedule a free written estimate. We’ll photograph every run before we touch it, deliver a fixed price before any work starts, and leave you with a documented photo record of what we found and what we fixed.
Why CleanRun Air Duct Cleaning Sandy Springs Is Decatur’s Preferred Duct Repair & Sealing Company
We’ve worked inside enough Decatur crawl spaces to know the pattern by heart. The craftsman bungalows in Oakhurst, the mid-century ranches along Scott Boulevard, the colonial revivals near Decatur Square-most were built before central air existed, then retrofitted with ductwork run through pier-and-beam crawl spaces over bare Georgia red clay. That soil releases moisture upward year-round. The result is duct runs that sweat, grow mold, and disconnect in ways you won’t find in newer suburbs with slab foundations and conditioned basements.
Our Duct Repair & Sealing crews have documented this exact failure mode in hundreds of Decatur homes since 2013. Every job starts with a written price under Haven Standard Clause 1. Every technician is background-checked, uniformed, and identified by name before arrival-Haven Standard Clause 3: Verified Crews. And every repair is backed by our 365-Day Done Right Promise in writing, not as a policy subject to manager approval.
We don’t do urgency theatre. We do documented evidence: photos of your actual ducts, a written scope, and a fixed price you can compare against any competitor’s quote. Bring us a written estimate from another company and we’ll put our number next to it for free-our Free Second Opinion is available at no cost.
Our Duct Repair & Sealing Services in Decatur
Duct Sealing
Most Decatur homes lose 20-35% of conditioned air through leaks at plenum connections, register boots, and seams in the trunk line. We seal with mastic sealant-a thick, fiber-reinforced compound that remains flexible for decades-rather than foil tape that dries and peels. In Decatur’s older homes, we often find the original sealant was never applied at all, or was done with duct tape that degraded years ago. A typical duct sealing job in Decatur runs $340-$620 for a single-system home, depending on access and the number of runs. We verify results with a static-pressure check at the air handler before we leave.
Flex Duct Repair
Flex duct in Decatur crawl spaces doesn’t age gracefully. The plastic inner liner cracks. The fiberglass insulation compacts. The wire helix rusts through. Worst of all, the connections at the plenum and register boots pull apart, dumping heated or cooled air into the crawl space instead of your living room. We replace deteriorated flex with new, properly supported runs-or, in Decatur’s moisture-challenged crawl spaces, we often upgrade to rigid metal duct with fresh insulation, which survives the environment better long-term. Flex duct repair in Decatur typically ranges from $180 per run to $740 for multiple replacements with plenum reconnection.
Metal Duct Repair
Pre-1970s DeKalb County homes often have galvanized steel trunk lines sized for smaller air volumes than modern systems demand. We’ve found these crushed flat against floor joists during plumbing retrofits or electrical upgrades, choking airflow to entire wings of the house. We reshape or replace damaged sections, seal all seams with mastic, and verify that each register is delivering its designed CFM-cubic feet per minute, the actual volume of air you can measure. Metal duct repair in Decatur generally runs $280-$560 per section, with full trunk-line replacement toward the upper end.
Duct Insulation
This is where Decatur’s geography makes sealing alone insufficient. Duct runs over bare red clay without a vapor barrier collect condensation on their exterior jackets all summer. The insulation gets wet, compresses, and turns mold-blackened from below. We strip damaged insulation, install a proper vapor barrier where possible, and re-wrap with new insulation rated for crawl-space humidity. In severe cases, we relocate runs to conditioned space or build sealed chases. Duct insulation work in Decatur ranges from $420 for spot re-wrapping to $890 for full-system re-insulation with vapor-barrier remediation.
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 Decatur
We build our repairs with materials from manufacturers whose specs you can look up yourself: Aprilaire for media filters and ventilation controls, Abatement Technologies for HEPA-filtered negative-air machines, and Guardsman for insulation and vapor-barrier products. Our equipment roster also includes Rotobrush and Nikro for source removal. We don’t claim these brands make our work better-we name them so you know exactly what you’re paying for and can verify performance claims against manufacturer data before you sign off on a price.
Common Duct Repair & Sealing Problems We See in Decatur Homes
- Wet, mold-blackened exterior insulation on crawl-space flex duct. The camera shows the jacket soaked from below while the interior stays dry and musty-smelling. Cleaning the interior doesn’t fix the source. Sealing and re-insulating the run, with a vapor barrier between duct and soil, does.
- Disconnected flex connections at the plenum. Decades of moisture cycling in Decatur’s humid crawl spaces cause the plastic inner liner to harden and tear at connection points. Conditioned air dumps into the crawl space. Your utility bill climbs. The back bedroom stays stale. We rebuild the connection with mastic and mechanical fasteners, then photograph the repair.
- Metal trunk runs crushed against joists during later renovations. A 1950s Decatur ranch’s original galvanized trunk was never meant to share space with PEX plumbing or Romex runs added in the 1990s. We reshape or replace the damaged section and verify static pressure recovery at the air handler.
- No vapor barrier between red-clay soil and duct run. This is a code gap common in pre-1970s DeKalb County construction that still affects much of Decatur’s housing stock. The clay releases moisture upward continuously. Without intervention, every new duct installation eventually faces the same failure mode.
Pricing for Duct Repair & Sealing in Decatur, GA
We publish ranges because Haven Standard Clause 1 requires a written price before any work starts. Here’s what duct repair and sealing costs in Decatur’s market:
- Duct sealing (mastic, single system): $340-$620
- Flex duct repair/replacement (per run): $180-$740
- Metal duct repair (per section): $280-$560
- Duct insulation/re-insulation: $420-$890
- Full-system sealing plus insulation in older crawl space: $740-$1,380
What moves a job toward the higher end: multiple crushed or disconnected runs, active mold requiring source removal under negative pressure with HEPA filtration, and limited crawl-space access common in Decatur’s tighter pier-and-beam foundations. What doesn’t affect price: the number of vents or registers. We price by system and scope, not by piecework.
Every estimate is free, written, and delivered before we remove a single panel. Call (678) 904-9744 to schedule.
We Also Serve Cities Near Decatur
Our crews work throughout the metro area. If you’re outside Decatur city limits, we also provide Duct Repair & Sealing in Decatur and surrounding communities including Atlanta, Smyrna, Lawrenceville, and Marietta. Scheduling and dispatch are coordinated from our Atlanta office; crews serve Decatur locally with the same documented standards.
Serving Decatur, GA - Our Local Coverage Area
We’re based in the Decatur 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 Decatur
The musty smell usually comes from mold on the exterior insulation jacket, not the interior duct surface. In Decatur’s pre-1960s homes, crawl-space flex duct sits over bare red clay with no vapor barrier. Moisture wicks upward continuously, saturating the insulation and supporting mold growth you can’t reach with interior cleaning. We strip the damaged insulation, treat the exterior, re-insulate with a vapor barrier, and seal all connections. Call (678) 904-9744 for a written quote-estimates are free.
Yes, but they may need repair first. Most Oakhurst bungalows were retrofitted with flex duct run through pier-and-beam crawl spaces, and after 60-plus years of moisture cycling, the connections have often pulled apart or the insulation has failed. We photograph the actual condition, quote repair and sealing together, and deliver a fixed price before starting. The 1952 Winnona Park bungalow we worked on had three sections of flex supply duct with soaked, mold-blackened jackets and two runs crushed flat against joists. After rebuilding in metal with mastic sealant and fresh insulation, the registers moved air for the first time in years.
Restricted airflow from a crushed or disconnected duct run is the most common cause we find in Decatur. Metro Atlanta’s muggy summers-sustained dew points in the low-to-mid 70s from June through September-mean your system is already working hard. When a supply run is flattened against a joist or disconnected at the plenum, that room gets whatever air leaks through, which isn’t enough. We measure static pressure and CFM at each register to locate the restriction, then repair and verify flow recovery. Call (678) 904-9744 for a free diagnostic estimate.
Cleaning addresses debris inside the duct. Repair addresses structural failures: disconnected joints, crushed runs, deteriorated insulation, and leaks that waste conditioned air. If you’ve had a cleaning and still smell musty air, still have uneven temperatures, or your utility bills keep climbing, the problem is almost certainly in the duct structure, not its interior surface. We include a free structural assessment with every estimate and photograph what we find so you can see the difference yourself.
Yes, particularly if your ducts run through an unconditioned crawl space. Sealing leaks and re-insulating wet, compressed insulation reduces the load on your HVAC system and can lower cooling costs measurably in a humid Decatur summer. More importantly, it stops the cycle of moisture damage that destroys ductwork from the outside in. We deliver a written scope and price before any work starts, and back every job with our 365-Day Done Right Promise. Call (678) 904-9744 to schedule your free estimate.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Decatur since 2013.