Fast, Reliable Duct Repair & Sealing Across Kirby
Duct repair and Air Duct Cleaning in Kirby typically costs $180-$650 depending on scope, and most jobs are completed in a single visit with same-day scheduling available. If your Kirby home was built between the 1950s and 1970s, there’s a strong chance your original ductwork is pulling in attic air, fiberglass particles, and dust through cracked mastic and separated joints. We answer calls live 24 hours a day at (866) 347-2063, and our technicians are on Kirby roads daily, from East Chittim to FM 78.
Our Duct Repair & Sealing team knows Kirby’s housing stock intimately. These post-war ranch homes, built for families stationed at what was then Randolph Air Force Base, weren’t designed for the kind of attic heat South Texas delivers now. When your duct system was installed, fiberglass insulation was new and mastic was fresh. After fifty-plus summers with attic temperatures climbing past 130°F, that original work has reached its end. We’re the company that shows you exactly what’s failing with a camera inspection, names one honest price before touching a tool, and stands behind the repair with our 90-Day Done Right Promise in writing.
Why Bellows Air Duct & Vent Co. of Texas Is Kirby’s Preferred Duct Repair & Sealing Company
We’ve been serving communities like Kirby since 1984, long enough to have worked on the same homes twice, once when the original owners called and again when their children inherited the house. That continuity matters in a small enclave city surrounded by San Antonio’s east side, where word travels and reputation is everything.
Our Kirby customers call back because they know what to expect. A live person answers the phone, day or night. A background-checked, uniformed technician arrives when we said they would. The camera goes in before any work starts, so you see what we see, cracked mastic, separated flex duct, rusted galvanized seams. Then we name one price. The number on the phone matches the number on the invoice. No bait coupons, no price changes at the door.
Most Kirby jobs are completed in a single visit. Our technicians carry Rotobrush agitation equipment, professional-grade mastic, R-8 insulation wrap, and replacement flex duct on their trucks. They don’t need to order parts and come back next week. And if something isn’t right, we return at no charge, no paperwork, no arguing. That’s the 90-Day Done Right Promise, stamped on every job.
Our Duct Repair & Sealing Services in Kirby
Duct Sealing with Mastic Sealant
Mastic sealant is the backbone of most Kirby repairs we perform. The original duct tape or mastic applied in 1964 or 1972 has long since dried, cracked, and failed under years of 130°F attic heat. We remove the degraded material, clean the joint surfaces, and apply fresh professional-grade mastic that remains flexible and bonded through thermal cycling. For metal duct seams, we reinforce with mesh tape before mastic application. This isn’t the hardware-store duct tape homeowners sometimes try. It’s a compound designed for HVAC applications that cures to a permanent, airtight seal.
Flex Duct Repair
Flex duct connections at the boot, register, or main trunk are a common failure point in Kirby’s older ranch homes. The plastic liner becomes brittle, the wire helix corrodes, and the connection separates entirely, drawing unconditioned attic air directly into your living space. On a recent job on East Chittim Road in the heart of Kirby, we encountered a 1964 ranch home where the original flex duct had separated at the main trunk, drawing in attic air heavy with fiberglass particles from degraded insulation. Using Rotobrush agitation and mastic sealant, we reconnected and sealed all joints, then insulated the exposed sections with R-8 wrap, cutting the homeowner’s energy bills by an estimated 15% and eliminating the musty dust smell that had plagued their living room for years. We also offer Kirby Dryer Vent Cleaning for complete home ventilation care.
Metal Duct Repair
Kirby’s 1950s-1970s homes with original galvanized sheet-metal ductwork present a specific challenge. Gulf moisture pushing inland from the southeast promotes rust at seams and joints, especially where standing water collects in low sections of attic runs. We cut out corroded sections, fabricate replacement pieces, and seal with mastic and mechanical fasteners. Where rust is extensive, we’ll show you on camera and talk through whether spot repair or section replacement makes more sense for your budget and system lifespan.
Duct Insulation Replacement
Original fiberglass duct insulation in Kirby homes has often degraded to the point where it sheds particles into the airstream. We remove compromised insulation, seal all underlying joints, and install fresh R-8 wrap with proper vapor barrier orientation. This is especially critical for ducts running through unconditioned attics, where the temperature differential between duct air and attic air drives condensation and further insulation breakdown.
What happens when you call
- 1
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.
Trusted Brands We Service in Kirby
Our trucks carry professional-grade equipment and materials from Rotobrush, Honeywell, and Aprilaire, the same brands serious contractors specify for permanent Kirby HVAC Cleaning and repairs. For Kirby homeowners, this means we don’t need to special-order parts and make you wait. We stock mastic sealant rated for extreme attic temperatures, R-8 insulation wrap with proper vapor barriers, and replacement flex duct in standard diameters. Most Kirby repairs are completed start to finish in one visit, with camera documentation before and after so you can see the difference.
Common Duct Repair & Sealing Problems We See in Kirby Homes
- Cracked original mastic and duct tape. The mastic or tape applied 50-plus years ago dries out and cracks in extreme attic heat, creating multiple leak points that allow attic contaminants into the living space. We see this in nearly every pre-1980 Kirby home we inspect.
- Separated flex duct connections. Flex duct connections at the boot or register separate due to age and thermal cycling, pulling in fiberglass particles and dust from the unconditioned space. The telltale sign is a register that blows noticeably warmer air than others, or a musty, dusty smell when the system cycles on.
- Rusted galvanized sheet-metal seams. Gulf humidity promotes moisture intrusion that rusts metal duct seams and joints, leading to structural failure and air leakage that compromises HVAC efficiency. Kirby’s position southeast of downtown San Antonio puts it directly in the path of incoming moisture.
- Heavy particulate soiling from freight corridors. Homes in Kirby sit downwind and adjacent to heavy freight traffic on I-10 East and the Loop 410 interchange, plus Union Pacific rail activity on the east side. Duct interiors here consistently show heavier soiling with dark particulate matter than comparable-age homes in cleaner-air quadrants of the San Antonio metro, a pattern our technicians recognize immediately when pulling registers.
Pricing for Duct Repair & Sealing in Kirby, TX
We believe in one honest price, shown before we start. Here’s what duct repair and sealing typically runs in the Kirby market:
| Service | Typical Range in Kirby |
|---|---|
| Single joint/seam mastic sealing | $180-$280 |
| Flex duct section repair or replacement | $250-$450 |
| Metal duct section repair with fabrication | $320-$550 |
| Duct insulation replacement (per section) | $200-$380 |
| Whole-system sealing and insulation refresh | $800-$1,800 |
What moves the number: accessibility of the duct run in your attic, extent of rust or damage, whether we can reach all joints from existing access points, and whether your system needs additional repairs beyond sealing. We don’t guess over the phone and then change the price at the door. Our technician inspects with a camera, shows you the exact condition, and names the exact price before any work begins. Estimates are free, and we honor our standing offer of $50 off any repair over $250. Call (866) 347-2063 to schedule.
We Also Serve Cities Near Kirby
Our technicians work daily across the east side of San Antonio and surrounding communities. We regularly schedule Duct Repair & Sealing in Kirby alongside calls in Windcrest, Converse, Live Oak, and Universal City. Same live-answer phone line, same upfront pricing, same 90-Day Done Right Promise applies in every city we serve.
Serving Kirby, TX - Our Local Coverage Area
We’re based in the Kirby 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 Kirby
Kirby’s 1950s-1970s ranch homes, originally built for JBSA-Randolph families, often retain original galvanized sheet-metal ductwork with degraded insulation and loose joints, where attic temperatures exceeding 130°F cause tape to fail and mastic to crack, pulling in dust and fiberglass from unconditioned spaces, a pattern far more common here than in newer suburban developments north or west of San Antonio. Newer homes use better materials, improved installation standards, and often place ducts within conditioned space. If your Kirby home still has its original duct system, inspection with a camera will show exactly where the failures are. Call (866) 347-2063 for a free estimate.
The most common signs are uneven temperatures between rooms, a musty or dusty smell when the HVAC cycles on, visible dust accumulation around registers, and increased allergy symptoms especially when the system runs. In Kirby specifically, we often find degraded fiberglass insulation that has turned gray and powdery, shedding particles directly into the airstream. Our camera inspection shows you the interior condition directly. If you suspect this problem, call (866) 347-2063 and we’ll confirm it with visual evidence.
Most 1960s Kirby homes can be restored to good performance with targeted repair and sealing if the metal trunk lines are structurally sound; full replacement becomes necessary when galvanized ducts are extensively rusted through, collapsed, or improperly sized for modern HVAC equipment. We make this assessment with a camera inspection and talk you through the actual condition, not a sales pitch. Our $50 off repair over $250 offer applies to qualifying work. Call for an honest second opinion.
Yes, the professional-grade mastic we apply is rated for continuous exposure to temperatures well above what Kirby attics reach, and it remains flexible through thermal cycling rather than cracking like older formulations. The key is proper surface preparation, removing all failed old material before application, which is why DIY repairs with hardware-store products often fail within a season. We warranty our sealing work under the 90-Day Done Right Promise. Call (866) 347-2063 to schedule.
Kirby’s position downwind from heavy freight traffic on I-10 East and the Loop 410 interchange, combined with Union Pacific rail activity, means duct interiors here consistently accumulate more dark particulate matter than comparable-age homes in cleaner-air areas of the metro. When your ducts also have leak points from failed seals, that outside contamination gets pulled directly into your living space with every HVAC cycle. Proper sealing stops this infiltration. We document the before and after with camera inspection so you can see the difference. Call (866) 347-2063 for a free estimate.
Ready to stop losing conditioned air to your attic and breathing the dust it’s been pulling in for decades? Call Bellows Air Duct & Vent Co. of Texas at (866) 347-2063. We’ll answer live, schedule you promptly, show up when we say, and name one honest price before we start. Our 90-Day Done Right Promise means if it’s not right, we make it right, no paperwork, no arguing. That’s been our way since 1984.
Written by Wade Kellerman, Owner at Bellows Air Duct & Vent Co. of Texas, serving Kirby since 1984.