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 typically costs $280-$680 for most homes, with flex duct replacement running $180-$340 per run and full-system mastic sealing between $450-$920. We’re usually on site within two business days of your call, and every job starts with a written price before a single panel comes off. Call (470) 326-1926 for a free estimate.
CleanRun crews have been working Decatur’s older neighborhoods since 2013. We know the difference between a 1940s Oakhurst bungalow with 1970s retrofit flex duct and a 1990s Decatur Heights ranch with original metal trunk lines. That matters because the failure modes are completely different, and the fix has to match the house. Our Duct Repair & Sealing team photographs every run before and after, and every repair is backed by our 365-Day Done Right Promise in writing.
Why CleanRun Air Duct Cleaning Johns Creek Is Decatur’s Preferred Duct Repair & Sealing Company
We’ve served more than 52,000 homes since 2013, and a significant share of those have been in Decatur’s historic neighborhoods. Homeowners here research before they call. They want to see what was found, what it costs, and what the finished work looks like. Our Documented Photo Record, included on every visit, shows the inside of every duct run before we start and after we finish. No other company in Decatur delivers that as a standard deliverable.
Our technicians are background-checked, uniformed, and identified by name before arrival, operating under Haven Standard Clause 3: Verified Crews. Tomas Reyes, who leads CleanRun, established the H.A.V.E.N. Standard in 2013 because he was tired of watching homeowners get a shop-vac visit and a bill with no proof anything happened inside the ducts. Every Decatur job gets a written scope, a written price, and a written warranty.
Scheduling and dispatch are coordinated from our Atlanta office, and crews carry Decatur-specific parts inventory, including flex duct collars, mastic sealant, and insulation wrap sized for the undersized retrofit trunks common in pre-1960 homes. That local parts stock means we don’t make two trips.
Our Duct Repair & Sealing Services in Decatur
Duct Sealing with Mastic Sealant
Most Decatur homes we work on leak 20-30% of conditioned air before it reaches the registers. The 1970s-era metal trunk lines in Oakhurst and Winnona Park were joined with snap-lock seams and tape that has dried and failed. We seal every joint, seam, and penetration with mastic sealant, a thick, fiber-reinforced compound that remains flexible and is rated for the temperature swings in unconditioned crawl spaces. A typical mastic sealing job in Decatur runs $450-$720 for a single-system home. We apply it by hand to ensure complete coverage, then photograph every sealed joint for your job record.
Flex Duct Repair
Flex duct installed in the 1960s-1980s retrofit boom is now reaching end of life in Decatur. The plastic liner becomes brittle, the insulation compresses, and the wire helix corrodes in damp crawl spaces. In Oakhurst, near the Agnes Scott College side, we opened a 1946 bungalow’s crawl space and found the 1970s flex runs to the rear bedrooms collapsed where they had been tie-wrapped to the old metal trunk; the red-clay floor held standing moisture and the flex liner was damp. We performed source removal with negative pressure and agitation tools, reconnected the flex to the trunk with mastic and new collars, sealed the plenum and supply and return ducts, and the homeowner immediately noticed better airflow at the registers and less grit on the floors. Flex duct repair or replacement in Decatur typically runs $180-$340 per run, depending on length and access.
Metal Duct Repair
Original galvanized metal ductwork in Decatur’s mid-century ranches and Cape Cods rusts from the inside out where condensation collects in low spots. We cut out corroded sections, fabricate replacement pieces on site, and seal with mastic and mechanical fasteners. Metal repair in Decatur homes averages $320-$580 per section, including materials. We use Guardsman-grade sealants and Abatement Technologies containment equipment to protect your home during the work.
Duct Insulation Replacement
Unconditioned crawl spaces and attics in Decatur destroy duct insulation. The fiberglass wrap on flex duct gets wet, compresses, and quits insulating. Metal ducts sweat through degraded wrap. We remove the damaged insulation, repair any underlying duct damage, and rewrap with R-6 or R-8 insulation rated for Georgia’s humidity. Insulation replacement in Decatur typically adds $140-$260 per run to the repair cost. The photo record shows the before condition and the finished wrap.
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
CleanRun crews carry professional-grade equipment from Rotobrush, Nikro, Abatement Technologies, and Guardsman, brands you can look up independently before you agree to any work. Our Decatur vans stock mastic sealant, flex duct, collars, and insulation wrap sized for the undersized retrofit systems common in Decatur’s older homes. That inventory means we diagnose, quote, and repair in a single visit rather than ordering parts and rescheduling. Every tool and material is named in your written scope, so you know exactly what was used inside your ductwork.
Common Duct Repair & Sealing Problems We See in Decatur Homes
- Collapsed flex duct in Oakhurst and Winnona Park crawl spaces. The 1970s flex runs tied to old metal trunks have sagged, torn at the collars, or collapsed entirely. Conditioned air dumps into the crawl space instead of reaching the bedrooms. The homeowner notices weak airflow and rooms that never cool properly.
- Chronic dampness from red-clay soil moisture. Decatur’s unvented crawl spaces sit directly over Georgia’s moisture-laden red clay. That ground moisture migrates upward, keeps duct liners damp, and drives mold colonization inside the flex. Cleaning alone won’t fix it; the duct has to be dried, repaired, and sealed.
- Undersized supply and return ducts from 1960s-80s retrofits. Contractors shoehorned central HVAC into homes never designed for it. The ducts are too small for modern equipment, so the blower motor strains, energy bills climb, and the system still can’t maintain temperature. Sealing helps; right-sizing helps more.
- Failed tape and snap-lock seams on metal trunk lines. The original joining methods have dried, cracked, or fallen off. Every seam becomes a leak point. We find these with pressure testing and seal them with mastic, which outlasts tape by decades in humid conditions.
Pricing for Duct Repair & Sealing in Decatur, GA
Here is what duct repair and sealing actually costs in Decatur’s market. These are whole-system prices, agreed in writing before work starts, with no per-vent add-ons or trip charges.
| Service | Typical Range in Decatur |
|---|---|
| Mastic sealant application (full system) | $450 - $720 |
| Flex duct repair / replacement (per run) | $180 - $340 |
| Metal duct section repair | $320 - $580 |
| Duct insulation replacement (per run) | $140 - $260 |
| Air leak detection and spot sealing | $280 - $450 |
| Combined repair + sealing package | $680 - $1,200 |
Three factors move Decatur jobs toward the higher end: multiple collapsed flex runs in a tight crawl space, mold remediation required before sealing can begin, and access limited by Decatur’s narrow historic lots where we can’t park equipment close to the crawl space entrance. Every job gets a written price before any work starts, under Haven Standard Clause 1. Bring us a competitor’s written estimate and we’ll deliver a free second opinion, our number next to theirs.
Call (470) 326-1926 for an exact quote. Estimates are free.
We Also Serve Cities Near Decatur
CleanRun crews work throughout metro Atlanta, including Duct Repair & Sealing in Decatur and surrounding communities. We also serve Smyrna, Lawrenceville, Snellville, and Marietta with the same written pricing, documented photo records, and 365-Day Done Right Promise.
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
Decatur’s historic core was built without central HVAC, so the ductwork is a 1960s-1980s retrofit threaded through unvented crawl spaces over red clay. That combination causes chronic condensation, collapsed flex runs, and disconnected joints that cleaning cannot fix. We regularly open crawl spaces in Oakhurst and find flex duct that has been dumping conditioned air into the dirt for years. Sealing and repair is the actual solution; cleaning is just the first step to see what’s wrong. Call (470) 326-1926 for a free inspection and written quote.
Standing moisture on the red-clay floor, collapsed 1970s flex duct tie-wrapped to rusted metal trunks, and mold colonization inside the damp liner. The camera shows it clearly. We document everything, then explain what sealing and repair will cost before any work begins. The photo record becomes part of your job file.
Yes, specifically because of Decatur’s older housing stock and crawl-space retrofit ductwork. Decatur sits in Georgia’s humid subtropical zone where indoor relative humidity regularly exceeds 60% in summer. When that humid air meets the cooler surface of ductwork in an unvented crawl space over damp red clay, condensation forms continuously. Systems in Decatur’s pre-1960 homes accumulate biological growth faster than in newer construction with conditioned crawl spaces or slab foundations. Mold remediation is almost as common a conversation as cleaning alone in Decatur. Call (470) 326-1926 for an inspection.
We seal with hand-applied mastic sealant at every joint, seam, and penetration, then test with a pressure differential gauge to verify the seal. Our process follows NADCA assessment and cleaning standards, and we use negative-pressure containment during any disturbance to prevent debris migration. The work is photographed, the test results are recorded, and everything is delivered in your job documentation. Call (470) 326-1926 to schedule.
Repair and sealing is usually the right choice for Decatur’s older homes if the metal trunk lines are structurally sound and the access points can be sealed. Full replacement runs $2,800-$5,500 in Decatur and requires opening walls or floors that original plaster and lath construction doesn’t forgive. We assess the trunk condition with a camera, quote both options in writing, and let the documentation guide the decision. Most Oakhurst and Winnona Park homeowners choose targeted repair and comprehensive sealing, then revisit replacement only if the trunks fail. Call (470) 326-1926 for a free second opinion on any estimate.
Ready to see what’s actually inside your ductwork? Call CleanRun at (470) 326-1926 for a free estimate. We’ll deliver a written price before any work starts, photograph every run before and after, and back the repair with our 365-Day Done Right Promise in writing. Haven Standard Clause 1: Written Price Before Any Work Starts. Every time. No exceptions.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Johns Creek, serving Decatur since 2013.