Duct Repair & Sealing in Kirby, TX

Fast, Reliable Duct Repair & Sealing Across Kirby

Duct repair and sealing in Kirby typically runs $180–$650 depending on whether we’re sealing metal joints with mastic, replacing collapsed flex sections, or insulating attic runs — and most Kirby jobs are completed same-day. We serve the 78244 ZIP from our San Antonio base, usually arriving within 30–45 minutes of a call from the Randolph Avenue corridor or the older ranch neighborhoods off FM 78. When Richard Anderson shows up, so does 17 years of hands-on experience — and the same Rotobrush and Nikro equipment we use on commercial jobs, right there in your driveway.

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Kirby’s not a drive-by market for us. We know the post-WWII ranch stock, the unconditioned attics that hit 140°F by July, and the pattern of military tenant turnover that leaves ductwork unserviced for decades. Our Duct Repair & Sealing team handles everything from original 1960s galvanized metal to failed first-generation flex — the kind of work that takes specialist tools and the patience to do it once.

Why Liberty Bell Air Duct Cleaning Service San Antonio Is Kirby’s Preferred Duct Repair & Sealing Company

We’ve earned 456 verified reviews averaging 4.9 stars across San Antonio and the surrounding communities, and Kirby customers specifically mention the difference of having the owner on-site. Richard Anderson doesn’t delegate to rotating crews — he’s the lead technician on every job, whether we’re sealing metal ductwork in a 1958 ranch near Randolph Avenue or replacing flex runs in a rental property off FM 78.

Our response time to Kirby averages under 40 minutes because we don’t route through dispatch centers in other counties. We know which mid-century homes have the original galvanized trunks, where the attic access is typically located, and why a quick patch won’t hold in a 140°F attic. That local knowledge saves Kirby homeowners a second visit — and second guess.

One specialist. Every service. No subcontractors. Your air quality is the only thing we do — not a side service between other trades.

Our Duct Repair & Sealing Services in Kirby

Duct Sealing

Most Kirby homes built between 1955 and 1975 have metal duct joints that were originally sealed with fabric tape or basic caulking — materials that degrade fast in our heat. We seal metal connections with professional-grade mastic, the same compound commercial HVAC contractors use, applied to clean surfaces so it bonds through summer after summer. In Kirby’s unconditioned attics, a proper mastic seal outlasts DIY patches by years. Typical sealing work for a full metal system in Kirby runs $280–$450.

Flex Duct Repair

Kirby has an unusually high concentration of original and early-generation flexible ductwork, much of it installed in the 1970s and 1980s when flex first replaced galvanized metal. These runs collapse under foot traffic in attics, separate at connection boots, and degrade from the inside out in humid conditions. We replace collapsed or torn flex with insulated, properly supported runs — often upgrading to Honeywell duct products rated for the thermal stress of South Texas attics. Flex repair or replacement in Kirby typically costs $180–$340 per run.

Metal Duct Repair

The galvanized steel ducts in Kirby’s post-war ranches are now 50–70 years old. We see rust-through at low points where condensation collects, separated seams from decades of thermal expansion, and boots that have pulled entirely away from ceiling registers. Richard Anderson repairs metal duct with proper sheet-metal patching, re-secures boots with mechanical fasteners (not tape), and seals with mastic. Metal repair in Kirby generally ranges from $220–$480 depending on accessibility and extent.

Duct Insulation

Uninsulated or degraded duct insulation in a Kirby attic is like running your AC through a sauna. We install fresh insulation on repaired or replaced runs, typically using products rated for the temperature extremes we see in 78244 attics. Proper insulation pays for itself in reduced cooling load — critical in a market where AC runs eight months a year. Insulation work added to repair runs $150–$280.

Mastic Sealant Application

Mastic is our standard for every metal joint we touch in Kirby — not an upsell, just how we do the work. We brush or trowel mastic onto cleaned seams, coating all connections and patch edges. In Kirby’s climate, mastic remains flexible enough to handle thermal cycling without cracking, unlike tape or caulk. This is included in our standard sealing pricing; we don’t charge extra for doing it right.

Trusted Brands We Service in Kirby

We carry Rotobrush and Nikro cleaning systems for pre-repair duct preparation, and stock Honeywell and Aprilaire duct products for replacement work — the same brands specified in commercial installations. For Kirby customers, that means no waiting on parts orders for standard flex, fittings, or insulation. We can often complete same-day repairs that other companies stretch across multiple visits because they’re routing parts from a central warehouse. Professional equipment — the same tools used in commercial settings, brought to your home.

Common Duct Repair & Sealing Problems We See in Kirby Homes

• Decades of deferred maintenance in military rental properties. Kirby’s proximity to Joint Base San Antonio-Randolph means many homes have military tenant turnover every 2–4 years, leading to decades of unserviced ductwork with collapsed flex sections and rodent intrusion that standard repairs miss. Landlords skip duct repair between tenants, so problems accumulate across multiple occupancy cycles.
• DIY mastic patches failing within a year. Homeowners and handymen often try to seal galvanized ducts with hardware-store mastic or tape, but Kirby’s high attic temperatures — regularly exceeding 140°F — cause these patches to crack and peel. We remove failed DIY work and apply proper mastic to cleaned, prepared surfaces so the seal holds.
• Original 1960s galvanized ductwork with rust and separation. The bulk of Kirby’s housing stock was built for military-adjacent working-class families in the 1950s–1970s, and many of these homes still have original rigid galvanized ducts. After 50–70 years, these systems show joint separation, rust-through at condensate points, and boots that have detached entirely from ceiling registers.
• Collapsed flex ducts from attic foot traffic. First-generation flexible duct installed in Kirby attics during the 1970s and 1980s was often laid directly on joists without proper support. Decades of maintenance traffic — HVAC techs, cable installers, homeowners storing holiday decorations — crushes these runs flat. On a Randolph Avenue home built in 1965, we found three collapsed flex duct runs from heavy attic foot traffic and a detached metal duct boot infested with rodent debris. Our crew used Rotobrush for interior cleaning, then sealed all metal joints with mastic and replaced flex sections with insulated Honeywell duct to prevent future detachment.

Pricing for Duct Repair & Sealing in Kirby, TX

We Also Serve Cities Near Kirby

We regularly run duct repair and sealing calls in Windcrest, Converse, Live Oak, and Universal City — the same day, same equipment, same owner-led service. If you’re in Bexar County and your ducts need attention, we’re likely already in the neighborhood.

FAQs — Duct Repair & Sealing in Kirby