Fast, Reliable Duct Repair & Sealing Across Kendall
Duct repair and sealing in Kendall, FL typically costs $280–$650 for most residential jobs, with flex-duct liner replacement running higher in 1970s–1990s homes where attic heat has accelerated deterioration. We usually diagnose and quote same-day, with repairs scheduled within 24–48 hours for Kendall’s 33156 zip and surrounding neighborhoods. Call (833) 858-4048 for a free estimate.
We’ve worked in Kendall long enough to know the difference between a quick tape patch and a real fix. Charles Rodriguez, our owner and lead technician, has spent 17 years crawling the hot attics of Miami-Dade’s western suburbs — from the concrete block ranches near Dadeland to the split-levels off SW 136th Street. Kendall’s homes weren’t built for gentle climates. When your air handler sits in a 140°F attic and runs 365 days a year, flex duct doesn’t just leak — it delaminates, grows mold, and recirculates whatever’s breeding up there into your bedrooms and living room. That’s not a maintenance issue. That’s a health issue. And it’s why we don’t send crews — Charles leads every job himself.
Why Pinnacle Air Duct Cleaning Service Florida Is Kendall’s Preferred Duct Repair & Sealing Company
Kendall homeowners don’t need another contractor who treats ductwork like an afterthought. They need someone who understands that a 1987 CBS home with original flex duct is a fundamentally different repair than a new construction job in Pinecrest.
Our Duct Repair & Sealing team has completed hundreds of jobs in Kendall’s 33156 zip and the surrounding corridors — enough that we recognize the construction eras by attic layout alone. Over 1,100 verified reviews back our work, with that 4.9-star average reflecting jobs where we found problems other companies missed and fixed them properly the first time. Charles doesn’t delegate to rotating technicians; he’s the one on the ladder, in the attic, applying the mastic himself. When your name is on the company, you don’t cut corners.
Response time matters in Kendall’s heat. We typically quote same-day and schedule repairs within 24–48 hours, because a leaking return duct in July isn’t a “next week” problem — it’s a mold incubator running on your electric bill.
Our Duct Repair & Sealing Services in Kendall
Flex Duct Repair
Kendall’s housing stock is brutal on flex duct. The bulk of 33156’s concrete block homes were built between the mid-1970s and early 1990s, with air handlers stuffed into unconditioned attics and connected by flexible fiberglass runs that were never designed for three decades of 130°F+ heat cycling. We regularly find liner that’s completely delaminated — bare fiberglass exposed, coated in black organic debris from years of condensation and spore infiltration. Charles replaces these runs with properly sized, insulated flex duct rated for Miami-Dade’s thermal load, sealed at every joint with mastic, not foil tape that’ll fail in eighteen months.
Mastic Sealant Application
Foil tape is everywhere in Kendall attics. It’s also everywhere failing. The thermal expansion and contraction in a Kendall attic — 140°F summer days dropping to 60°F winter nights — cracks tape joints within a year or two. We brush on water-based mastic sealant, forcing it into gaps and building a flexible, permanent bond that moves with the metal. On a recent job near SW 128th Street, we pulled off three layers of dried, cracked tape from a 1992 installation and found 15% measured airflow loss at the plenum alone. Mastic fixed it. Tape would have failed again by spring.
Air Leak Repair
Every leak in a Kendall duct system is an entry point for humid, spore-laden air. With outdoor dew points in the 70s°F from April through October, a 5% return leak can saturate adjacent insulation and trigger mold growth within a single cooling season. We pressure-test systems, locate leaks with smoke pencils and thermal imaging, and repair with mechanical fastening plus mastic — never tape alone. In Kendall’s climate, a “small” leak isn’t small for long.
Metal Duct Repair
Some older Kendall townhomes and commercial conversions still run galvanized steel trunk lines. These corrode at seams, separate at hangers, and amplify noise when supports fail. Charles has fabricated replacement sections and resealed existing runs in properties from Dadeland-adjacent condos to the mixed-use buildings near The Falls. Metal work takes longer than flex replacement, but in certain layouts it’s the right repair — and we’ll tell you when it is and when it isn’t.
Duct Insulation
Attic duct in Kendall needs proper insulation, not the thin factory wrap that came with the original 1980s install. We replace degraded insulation with formaldehyde-free fiberglass wrap or closed-cell foam where space allows, maintaining R-value even at 140°F ambient. Without it, you’re paying to cool air that’s reheating before it reaches your vents.
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.
Trusted Brands We Service in Kendall
We don’t use big-box equipment. Our trucks carry Rotobrush rotary brush systems for mechanical agitation, Nikro HEPA vacuums for contained debris removal, and Abatement Technologies negative-air machines for jobs where mold is confirmed. For controls and filtration upgrades tied to repair work, we install Honeywell and Aprilaire components — brands we’ve found hold up in Miami-Dade’s humidity where cheaper units corrode or fail. We stock common plenum fittings, flex-duct diameters, and mastic supplies locally, so Kendall repairs don’t wait on shipping.
Common Duct Repair & Sealing Problems We See in Kendall Homes
- Flex-duct liner deterioration from 130°F+ attic heat. The fiberglass inner layer separates from the mylar jacket, exposing raw fiber and creating turbulence that drops airflow by 20–30%. We see this in maybe 60% of pre-1995 Kendall homes we inspect.
- Condensation in attic flex runs breeding mold within 12 months of a “repair.” If the last guy just taped the leak without addressing insulation or slope, humidity condenses on cold duct surfaces and microbial growth restarts before the next summer.
- Improper mastic application on aluminum foil tape joints. Tape alone under Miami-Dade thermal cycling cracks, peels, and leaks. We remove old tape entirely, clean the surface, and apply mastic to bare metal or properly prepared flex cuffs.
- Return-air leaks pulling Everglades-zone spores and organic debris. Kendall’s position at the urban-wetland interface means elevated biological particulate loads year-round. A leaking return doesn’t just waste energy — it introduces pollen, mold spores, and organic matter directly into your air handler and living spaces.
Pricing for Duct Repair & Sealing in Kendall, FL
| Service | Typical Range in Kendall |
|---|---|
| Air leak sealing (mastic, up to 10 joints) | $280–$420 |
| Flex duct section replacement (single run) | $340–$550 |
| Full flex-duct liner restoration (whole system) | $1,800–$3,200 |
| Metal duct seam repair and resealing | $450–$780 |
| Duct insulation replacement (attic runs) | $520–$890 |
| System pressure test with leak documentation | $180–$260 |
What moves you within these ranges? Attic accessibility, duct accessibility, extent of mold contamination requiring containment, and whether we’re matching existing diameter or upsizing for corrected airflow. Homes near the western edge of 33156, closer to the wetlands, often need more extensive return-sealing due to higher particulate loading. We quote upfront after inspection — no open-ended billing. Estimates are free; call (833) 858-4048 to schedule.
We Also Serve Cities Near Kendall
Our repair radius covers Pinecrest to the north, Glenvar Heights and South Miami to the east, and Cutler to the south. Same owner-led service, same equipment, same-day response throughout the corridor. If you’re on the border between Kendall and one of these neighborhoods, we’ll confirm coverage when you call — we don’t charge differently based on which side of the line you’re on.
Serving Kendall, FL — Our Local Coverage Area
We’re based in the Kendall 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 Kendall
Yes — cleaning removes debris from accessible surfaces, but it doesn’t restore failed joints or delaminated liner. In a 1985 Kendall home with original flex duct, the liner has likely degraded from decades of attic heat cycling, meaning you’re recirculating air through unsealed, deteriorating material even after a thorough cleaning. We inspect for this during every cleaning and will show you photos of what we’re seeing. Call (833) 858-4048 to combine cleaning with sealing in one visit.
Yes, we work in tight Kendall attics regularly — including the low-clearance spaces common in the SW 136th Street corridor’s 1980s and early-1990s builds. Charles carries compact tools for restricted spaces and has repaired insulation in attics with as little as 24 inches of clearance. We’ll assess whether the existing duct is worth re-insulating or if replacement is more cost-effective given its condition.
It could be either, or both — we don’t guess. We collect samples for lab identification or use ATP testing on-site to distinguish organic growth from carbonized dust and debris. In Kendall’s humidity, black staining on flex-duct liner is often Cladosporium or Aspergillus species colonizing condensed moisture, especially near leaks. If it’s mold, we contain the work area and follow remediation protocols before sealing. If it’s debris, we remove it and seal to prevent recurrence. Either way, you’ll know before we proceed.
Yes. While most Kendall residential work involves flex duct, we’ve repaired galvanized steel trunk lines in townhomes near Dadeland and The Falls, including seam sealing, hanger replacement, and section fabrication. Metal duct lasts longer but corrodes at joints and can separate from vibration. We’ll evaluate whether repair or strategic replacement with flex makes sense for your specific layout.
Properly applied mastic sealant on mechanically secured joints lasts 15–20 years in Kendall’s climate — we’ve returned to homes we sealed in 2012 with zero degradation. Tape-only repairs typically fail in 1–3 years here. The key difference is preparation: we remove old tape, clean oxidation from metal, and apply mastic to bare surfaces at the correct thickness. We warranty our sealing workmanship for 5 years, and we’ll tell you honestly if your duct is too far gone for sealing to be worthwhile.
Written by Charles Rodriguez, Owner at Pinnacle Air Duct Cleaning Service Florida, serving Kendall since 2007.