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 Lawrenceville
Most duct repair and sealing jobs in Lawrenceville run $280-$650 for a single system, with full flex-duct replacement on older Gwinnett County homes reaching $1,200-$2,400 depending on attic access and how many runs have failed. We’re at (678) 904-9744 if you want a written price before any work starts.
Our crews serve Lawrenceville from our Atlanta dispatch office, and we’ve worked the subdivisions off Sugarloaf Parkway, the Lawrenceville Highway corridor, and the neighborhoods around Tribble Mill Park enough times to know what we’re walking into before the truck rolls up. That matters here. Lawrenceville’s housing stock isn’t generic, and duct problems that look identical on the surface - low airflow, hot upstairs rooms, musty smells - trace back to two completely different root causes depending on whether your home was built in 2025 or 1995. We don’t guess. We camera first, then quote in writing.
Why CleanRun Air Duct Cleaning Sandy Springs Is Lawrenceville’s Preferred Duct Repair & Sealing Company
We’ve been in Lawrenceville homes since 2013, and the pattern is consistent enough that our technicians now carry specific flex-duct repair inventory for the 1985-2005 subdivisions that dominate eastern Gwinnett County. The 365-Day Done Right Promise applies to every Lawrenceville job in writing, not as a verbal afterthought.
Our photo records from Lawrenceville jobs show the same findings repeatedly: original builder-grade flex duct with separated inner liners, mastic seals that never cured properly because they were applied in 95°F attics, and supply boots pulling away from drywall because the original strapping failed. These aren’t hypotheticals. They’re what the camera shows, and we deliver those photos to the homeowner before we pack up.
Haven Standard Clause 3 means every crew member is background-checked, uniformed, and identified by name before arrival. No exceptions. No subcontractor roulette.
Our Duct Repair & Sealing team brings Rotobrush and Abatement Technologies equipment to Lawrenceville jobs, and we stock Guardsman-grade mastic and flex duct in common diameters so we’re not making a supply run while your attic is open.
Our Duct Repair & Sealing Services in Lawrenceville
Flex Duct Repair
This is the bulk of our Lawrenceville work, and for specific reasons. The city’s 1985-2005 builder-grade subdivisions off Sugarloaf Parkway and along the Lawrenceville Highway corridor were almost universally ducted with flexible duct routed through vented attics. After 25-35 summers of 140°F+ attic heat, that flex has sagged, kinked, and - most critically - suffered inner liner separation from the outer jacket. We camera every run before touching it. Aggressive agitation on separated liner blows debris straight into your living space. Our field protocol: isolate under negative pressure with HEPA filtration, replace failed sections with new flex, then seal plenum and boot connections with mastic. Static pressure gets measured before and after. The numbers don’t lie.
Duct Sealing
Lawrenceville’s new construction has its own sealing problem. The drywall crews and HVAC contractors rarely coordinate, so construction dust and debris sit in supply and return ducts at handover. That material doesn’t stay put. It migrates to the air handler, coats the blower motor, and forces premature bearing wear. Sealing a new Lawrenceville build means source-removing that debris first, then sealing with mastic at every joint - not tape, which degrades in attic heat. We seal differently on new builds versus older homes. New builds get aggressive source removal plus sealing. Older homes get leak detection, liner assessment, then targeted sealing of intact runs plus replacement of failed ones.
Metal Duct Repair
Hard-pipe metal duct is less common in Lawrenceville’s dominant housing stock, but it appears in some custom builds near Tribble Mill Park and in renovation projects where homeowners upgraded from original flex. Metal duct fails at seams and where supports have corroded or pulled free. We repair with proper sheet-metal patches, seal with mastic, and insulate if the run passes through unconditioned space. The same photo documentation applies: before, during, after.
Mastic Sealant Application
Mastic is the only sealant we use in Lawrenceville attics. Tape fails. Every time. In 140°F+ heat, adhesive-backed tape releases, shrinks, and creates new leaks within two to three years. Mastic is a water-based compound that cures to a flexible, permanent seal. We apply it with brushes at every joint, boot connection, and plenum penetration. Haven Standard Clause 1 requires the written price to include every linear foot of mastic application - no per-joint add-ons, no surprises when the crew is already in your attic.
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 Lawrenceville
Our equipment roster includes Rotobrush agitation systems, Abatement Technologies negative-air machines, and Guardsman-grade mastic and sealants. We don’t buy tools you can’t look up. Aprilaire components appear in some Lawrenceville HVAC systems we encounter, and we carry common replacement parts so a repair doesn’t turn into a two-day wait. Every brand we name is one you can verify independently - manufacturer specs, third-party reviews, trade publication tests. That’s the point. Documented evidence does the persuading.
Common Duct Repair & Sealing Problems We See in Lawrenceville Homes
- Inner liner separation in original flex duct. The late-1990s flex in Sugarloaf Parkway-area homes has an inner liner that separates from the outer jacket after years of attic heat exposure. It collapses under suction during cleaning. We camera first, every time.
- Construction debris in new builds. Lawrenceville’s 2023-2025 subdivisions often have drywall dust, wood chips, and fastener debris in supply ducts at handover. The builder’s rough clean doesn’t reach the ductwork. We source-remove it before sealing.
- Condensation-driven biofilm in aging flex. Georgia’s humid summers create condensation inside attic-run flex duct. What looks like dust at the register is often mold growth on the duct wall. Surface wiping doesn’t reach it. Replacement or negative-pressure extraction does.
- Failed mastic from original installation. Builders in the 1990s and 2000s sometimes applied mastic in conditions too hot for proper curing. It cracks, flakes, and leaks. We remove failed material and reapply under proper temperature and humidity conditions.
Pricing for Duct Repair & Sealing in Lawrenceville, GA
A typical flex-duct repair on a single run in Lawrenceville runs $280-$450. Full replacement of all attic flex on a 2,500-square-foot home with 4-5 tons of capacity generally falls between $1,200 and $2,400. Duct sealing with mastic application on an intact system costs $380-$650. Camera inspection, required before any work on older flex, is $125-$180 and gets credited toward the repair if you proceed.
What moves the number: attic accessibility (truss spacing, decking presence), how many runs have failed, whether the plenum itself needs resealing, and if we’re working around stored items. We don’t quote per-vent. Haven Standard Clause 1 means one flat price per system, agreed in writing before a panel comes off. Bring a competitor’s written estimate and we’ll deliver a free second opinion, also in writing.
Call (678) 904-9744. Estimates are free. The written price is real.
We Also Serve Cities Near Lawrenceville
Our crews work Duct Repair & Sealing in Lawrenceville and the surrounding Gwinnett County area regularly, including Norcross, Duluth, Suwanee, and Decatur. Each city gets the same written-price protocol and documented photo record, though the failure patterns differ - Decatur’s older hard-pipe stock presents differently than Lawrenceville’s flex-duct concentration, and we adjust our approach accordingly.
Serving Lawrenceville, GA - Our Local Coverage Area
We’re based in the Lawrenceville 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 Lawrenceville
Construction debris from drywall sanding, wood cutting, and general rough work settles in supply and return ducts during building, and most Lawrenceville builders don’t source-remove it before handover. That debris migrates to your air handler and blower motor within the first year, reducing efficiency and forcing premature wear. We remove it with negative-pressure extraction, then seal every joint with mastic so the system operates as designed. Call (678) 904-9744 for a written estimate - we document what we find with photos before quoting.
Some runs are repairable, some aren’t, and we can’t tell without a camera inspection. The original flex in Lawrenceville’s 1990s subdivisions often shows inner liner separation that makes agitation cleaning dangerous - the liner debris blows into living spaces. We isolate failed runs under HEPA-filtered negative pressure, replace them with new flex, and seal intact runs with mastic. The goal is targeted replacement, not wholesale demolition, but we won’t know the split until we see inside. The camera inspection is $125-$180, credited toward repair.
Because separated inner liner in aging flex duct collapses under suction and contaminates your living space. We were called to a 1998 two-story in the Sugarloaf Parkway corridor where the second-floor registers were barely moving air and the homeowner had been told it was the blower motor. Our tech ran camera inspection first and found the original late-1990s flex duct behind the air handler with its inner liner separated and collapsed under suction. Rather than agitating it and blowing that liner debris into the living space, we isolated the run under negative pressure with HEPA filtration and replaced it with new flex, then sealed the plenum and boot connections with mastic. Static pressure at the air handler dropped, and every register in the house started reading consistent airflow again. Camera first. Always.
Probably. Georgia’s humidity creates condensation inside attic-run flex duct, and that moisture supports mold growth on the duct wall that you can’t reach with a surface wipe. The smell intensifies in summer because the temperature differential between attic and conditioned air increases condensation. We camera the runs, identify biofilm accumulation, and either extract with negative pressure or replace the affected sections. Sealing with mastic afterward prevents new infiltration of humid attic air. Call (678) 904-9744 - we’ll show you what the camera sees before you commit to anything.
No. New builds need source removal of construction debris first, then mastic sealing at every joint. The debris is the primary problem; leaks are often secondary from joints that were never properly sealed during rushed construction. Older homes need leak detection, liner integrity assessment, then targeted sealing of intact runs plus replacement of failed flex. Same mastic, different prep. Same written price before work starts. Call (678) 904-9744 and we’ll specify which protocol applies to your house.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Lawrenceville and metro Atlanta since 2013.