Duct Repair & Sealing in Johns Creek - Tested First, Written Price Second

Trusted Duct Repair & Sealing for Johns Creek Homeowners

Duct repair and sealing in Johns Creek typically costs $280-$780 for most residential jobs, with full-system sealing running higher depending on home size and accessibility. If you’re wondering how much Duct Repair & Sealing costs in nearby areas, pricing follows similar patterns across North Fulton County. CleanRun Air Duct Cleaning Johns Creek has completed this work in more than 52,000 homes since 2013, every one starting with a written price before a tool came out of the truck. Call us at (470) 326-1926 for a free estimate with no obligation.

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The problem we solve is straightforward: conditioned air leaking into your attic, crawl space, or wall cavities before it ever reaches your rooms. In Johns Creek, where summer humidity pushes into the 90s and winter nights drop below freezing, even a 15% duct leakage rate can add $40-$80 monthly to your energy bill and leave second-floor bedrooms uncomfortable while the thermostat reads 72. We’ve photographed the evidence in homes from Abbots Run to St. Ives Country Club - disconnected flex duct lying in blown insulation, metal seams gapped from thermal expansion, mastic sealant crumbled to dust after a decade of heat cycling. The camera doesn’t exaggerate, and neither do we. Every repair we quote comes with a written price under Haven Standard Clause 1, and every completed job includes a Documented Photo Record of every duct run, before and after, delivered to you as part of the standard job record.

Our technicians are background-checked, uniformed, and identified by name before arrival under Haven Standard Clause 3: Verified Crews. We operate professional-grade equipment from Rotobrush, Nikro, Abatement Technologies, and Guardsman - brands you can verify independently. The 365-Day Done Right Promise backs every job in writing: if it’s not done right, we make it right. No manager approval required.

What Our Duct Repair & Sealing Service Includes

Duct Sealing

Duct sealing closes the gaps, seams, and connection points where conditioned air escapes your supply system or unconditioned air enters your return. In Johns Creek homes built during the 1990s and 2000s construction boom, we regularly find original ductwork with factory seams that were never sealed beyond a foil tape that has since dried and peeled. Our crews apply mastic sealant - a thick, fiber-reinforced compound that remains flexible across temperature swings - to every accessible joint, then verify with a duct blaster test when the job scope includes it. The result is measured, not assumed: you’ll see the before-and-after leakage rate in your job documentation.

Flex Duct Repair

Flex duct, the insulated flexible tubing common in residential branch runs, collapses, tears, or disconnects at the collar where it meets the plenum or register boot. In Johns Creek’s older neighborhoods like Country Club of the South and Rivermont, we’ve replaced flex duct crushed by storage items in attics and flex duct chewed by rodents in crawl spaces. Our repair includes proper support every 4-5 feet to prevent sagging, metal-reinforced collars for secure connections, and fresh insulation wrap where the original has compressed or torn. Every repair is photographed before we close the access panel.

Metal Duct Repair

Galvanized steel ductwork, found in many Johns Creek homes with original construction or past renovations, develops seam separation, rust at condensation points, and holes from corrosion or mechanical damage. We repair metal duct by cutting out damaged sections, fabricating replacement pieces to fit, and sealing with mastic and mechanical fasteners - not tape alone, which fails within months in Georgia’s humidity. When a section is too corroded to salvage, we replace it with new galvanized steel or transition to flex duct where appropriate, documenting the decision in your written scope.

Duct Insulation

Duct insulation prevents thermal loss as air travels through unconditioned spaces. In Johns Creek, where attic temperatures exceed 140°F in July, poorly insulated ductwork can raise supply air temperature by 10-15 degrees before it reaches your vents. We install fresh fiberglass wrap with vapor barrier or closed-cell foam insulation where the existing layer has compressed, torn, or been disturbed by prior service work. The improvement shows up in your photo record: infrared images where we use them, and temperature readings at the register before and after.

Mastic Sealant Application

Mastic is the industry-standard sealant for durable, long-lasting duct closure - a thick, paintable compound that bridges gaps up to 1/4 inch and remains flexible through decades of thermal cycling. Unlike foil tape or duct tape, which degrade in attics within 2-3 years, mastic cures to a rubber-like finish that accommodates expansion and contraction. Our crews brush mastic onto every seam, joint, and penetration in accessible ductwork, then allow proper cure time before pressurizing the system. We use Guardsman-grade mastic on jobs where manufacturer specifications call for it, and we photograph the application so you can verify coverage.

Air Leak Repair

Air leaks in ductwork often occur at the plenum connection, where the main trunk meets the air handler; at register boots, where the duct meets the wall or ceiling; and at dampers or balancing devices that have loosened over time. We pressurize the system and use smoke pencils or theatrical fog to locate leaks that aren’t visible to casual inspection, then repair with appropriate methods - mastic for seams, mechanical fastening for disconnected components, replacement for damaged boots or collars. The leak location and repair method are noted in your written job record, with photos.

Brands We Service for Duct Repair & Sealing

CleanRun Air Duct Cleaning Johns Creek works on duct systems connected to all major HVAC brands, and our crews carry the training and parts inventory to service equipment from Honeywell, Aprilaire, and other manufacturers commonly found in North Fulton County homes. We’ve serviced hundreds of Honeywell media air cleaners and electronic air cleaners, and we stock replacement gaskets and collar adapters for their duct-mounted components. For Aprilaire whole-house humidifiers and dehumidifiers integrated into duct systems, we carry the OEM water panels, orifice fittings, and duct transition pieces that let us repair without improvising.

Whether your system includes Honeywell, Aprilaire, or any other make, we can help. Our equipment roster also includes Rotobrush and Nikro for duct cleaning and inspection, Abatement Technologies for negative-pressure containment, and Guardsman for sealant applications - professional-grade tools you can look up independently before agreeing to any price. Every repair quote includes a written scope naming the specific brands and materials to be used.

Before

After

Signs You Need Duct Repair & Sealing Right Now

• Uneven temperatures room to room. If your master bedroom runs 6 degrees warmer than the kitchen in summer, or your basement stays frigid while the upstairs overheats, the duct system is likely leaking or blocked. We’ve traced this symptom in Johns Creek homes to disconnected flex duct in the attic, dampers stuck closed from debris, and supply boots that have separated from drywall entirely.
• Dust accumulation immediately after cleaning. A home that returns to dusty surfaces within 48 hours of cleaning often has return duct leaks pulling attic air - and attic insulation particles - into the system. In Georgia’s pollen seasons, this also means unfiltered outdoor air entering your breathing space. We verify with a camera inspection of the return plenum and trunk.
• Energy bills rising without rate increases. A 20% duct leakage rate can increase HVAC energy consumption by 30-40% according to Department of Energy estimates. If your summer bills in Johns Creek have climbed past $300 for a 2,500-square-foot home with no thermostat change, the duct system is a prime suspect. We measure leakage with a duct blaster and show you the number.
• Whistling or rushing air sounds from walls or ceilings. These noises indicate high-velocity air escaping through gaps - often at register boots or where flex duct has pulled away from the collar. The sound is the symptom; the energy waste and comfort loss are the problems. Our smoke-pencil testing locates the exact source before we quote repair.
• Musty or chemical odors when the system runs. Leaky return duct in a crawl space or garage can pull in mold spores, gasoline fumes, or pest debris. In Johns Creek’s clay-heavy soils, crawl spaces often hold moisture that supports microbial growth. We inspect with a borescope camera and seal or replace the affected sections, documenting what we found.

Our Duct Repair & Sealing Process - Step by Step

1. 1
   Written estimate before work begins. We inspect your accessible ductwork with a borescope camera, identify leakage points or damage, and deliver a written price with line-item scope. Haven Standard Clause 1 requires this - no exceptions, no “call for a quote.” You’ll know the exact cost before we remove a single access panel.
2. 2
   Photo documentation of existing conditions. Before touching anything, we photograph the inside of every duct run we will address: the debris pattern, the gap width, the corrosion depth, the insulation condition. These images become your “before” record, time-stamped and included in your job documentation.
3. 3
   Targeted repair with trade-appropriate methods. We don’t default to one solution. Flex duct gets support straps and reinforced collars; metal seams get mastic and mechanical fasteners; damaged sections get cut out and replaced with matched materials. We use Rotobrush and Nikro equipment where cleaning precedes sealing, and Guardsman mastic where manufacturer specifications apply.
4. 4
   Pressure testing and verification where applicable. For full-system sealing jobs, we run a duct blaster test to measure leakage before and after repair. The improvement is a number, not a feeling - typically 20-35% leakage reduction in homes with original 1990s construction. We record the result in your written job record.
5. 5
   After photos, written warranty, and final documentation. Every repaired run is photographed after completion. You receive the complete photo record, the written scope actually performed, and the 365-Day Done Right Promise in writing. If the repair fails or the leak returns, we make it right without renegotiation.

How Much Does Duct Repair & Sealing Cost in Johns Creek?

Duct Repair & Sealing Near Johns Creek - Our Service Area

CleanRun Air Duct Cleaning Johns Creek serves homeowners throughout North Fulton and Gwinnett counties, including Duct Repair & Sealing in Duluth, Duct Repair & Sealing in Alpharetta, and surrounding communities: Norcross, Suwanee, Roswell, Dunwoody, Milton, Sandy Springs, Cumming, Lawrenceville, and Buford. Most Johns Creek appointments are scheduled within 2-4 business days, with written estimates delivered on the first visit. For homes in the Rivermont, Country Club of the South, or Abbots Run neighborhoods, our crews are familiar with the specific duct configurations common to your builder and vintage.

Frequently Asked Questions - Duct Repair & Sealing in Johns Creek

Schedule Your Duct Repair & Sealing Service in Johns Creek Today

Call CleanRun Air Duct Cleaning Johns Creek at (470) 326-1926 for a free, no-obligation estimate. We’ll inspect your ductwork with a camera, deliver a written price before any work begins, and complete every repair with the documented photo record and 365-Day Done Right Promise that have defined our work since 2013. All calls are answered by a live person, 24/7.

Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Johns Creek, serving Johns Creek, Duluth Duct Repair & Sealing, Alpharetta, and surrounding communities since 2013.