Fast, Reliable Duct Repair & Sealing Across Kendall
Duct repair and sealing in Kendall, FL typically costs $180–$650 depending on the scope, with flex duct replacement running higher than sealant work, and most repairs are completed in a single visit. If your home was built during Kendall’s 1970s–1980s suburban boom, you’re likely dealing with original flex duct or fiberglass duct board that’s now 35–50 years old — and in this market, that’s not just an age problem, it’s a Duct Repair & Sealing challenge shaped by extreme attic heat and Everglades-origin biological load you won’t find in neighboring cities.
We’re Apex Air Duct Cleaning Service Miami, and we work Kendall regularly. Owner Michael Brown handles the fieldwork personally, and we’ve spent 11 years learning how this suburb’s specific conditions — CBS construction, unconditioned attics hitting 130–140°F, and return-air systems pulling mold spores from adjacent wetlands — accelerate duct failure in ways that generic repair approaches miss. From the 33156 corridor near Dadeland Mall to the quieter blocks west of SW 107th Avenue, we know what hides in Kendall ductwork. Call (833) 628-3661 for a free estimate.
Why Apex Air Duct Cleaning Service Miami Is Kendall’s Preferred Duct Repair & Sealing Company
Kendall isn’t a generic Miami suburb to us. We’ve repaired ducts in the original 1970s ranch homes near Kendall-Tamiami Cemetery, in the larger two-story builds off SW 88th Street, and in the 1980s subdivisions closer to Pinecrest — and the failure patterns change block by block based on construction era and attic configuration. That granular familiarity matters when you’re deciding whether to seal, repair, or replace.
Our reputation here is documented: 867 verified reviews averaging 4.9 stars, with Kendall customers specifically citing our willingness to show the problem before quoting the fix. Michael Brown arrives as the lead technician on every job — not a rotating subcontractor who needs directions to your neighborhood. We’ve responded to Kendall calls from Dadeland to the western edges near the Turnpike, and we understand the urgency when a duct system is pumping fiberglass particles or mold spores into a home with children or elderly residents.
The equipment makes a difference too. We run professional-grade Rotobrush and Nikro negative-pressure systems — the same tools commercial restoration contractors use, not shop vacs with brush attachments. When we’re sealing or repairing in Kendall, that extraction capability means we don’t just patch the duct; we clean the contamination that caused or resulted from the failure.
Our Duct Repair & Sealing Services in Kendall
Flex Duct Repair
Kendall’s 1975–1988 housing stock is riddled with original flex duct that’s reached end of life. In unconditioned attics where summer temperatures hit 130–140°F, the inner plastic liner becomes brittle and delaminates, releasing fiberglass and adhesive residue directly into your supply air. We remove the compromised sections entirely — partial repairs fail quickly here — and replace with properly sized, insulated flex duct or upgrade to galvanized metal where routing allows. Every joint gets mastic sealant, not tape, because Kendall’s humidity cycling destroys tape adhesives within months.
Mastic Sealant Application
Air leaks at duct joints are epidemic in Kendall homes where original installers used foil tape instead of mastic. The problem compounds uniquely here: negative pressure from leaks draws in Everglades-origin mold spores, organic particulates, and the elevated biological load that Kendall’s wetland adjacency produces. We seal every accessible joint with professional-grade mastic, pressure-test the system, and verify seal integrity. In a 33156 home near SW 72nd Street, we recently measured 22% air loss through unsealed joints — after mastic application, that dropped to under 4%, with immediate improvement in both efficiency and indoor air quality.
Metal Duct Repair
Where Kendall homes have galvanized metal supply trunks — more common in larger builds from the late 1980s — we repair seam separations, corrosion damage, and disconnected takeoffs. Metal duct in this market suffers from condensation-driven corrosion at seams where insulation has degraded, and from physical damage where contractors have crawled over trunk lines in tight attics. We patch, re-seam, and re-insulate with vapor-barrier-grade wrap rated for Kendall’s 90%+ rainy-season humidity.
Duct Insulation Replacement
Original duct insulation in Kendall homes has vapor barriers that failed years ago. Once that outer jacket degrades, humid attic air reaches the duct surface, condensation forms, and mold colonizes the insulation from the outside in — often completely hidden until we open the system. We strip contaminated insulation, treat the duct surface for microbial growth, and install new insulation with intact vapor barriers. In homes near the Everglades edge, we specify higher R-value insulation to combat the extreme thermal differential between 140°F attics and 55°F conditioned air.
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 work with Honeywell, Aprilaire, and Abatement Technologies components regularly — and we stock common repair parts so Kendall customers aren’t waiting on Miami warehouse delays. When we replaced the contaminated flex duct in that 1983 CBS home on SW 88th Street, we installed an Aprilaire 5000 air purifier to capture residual fibers; the homeowner’s allergy symptoms resolved within 72 hours. For duct sealing and repair materials, we use mastic compounds and insulation products rated for South Florida’s humidity extremes, not generic hardware-store stock that degrades in this climate.
Common Duct Repair & Sealing Problems We See in Kendall Homes
- Fiberglass duct board delamination from extreme attic thermal cycling. Original 1970s–80s duct board in Kendall attics experiences 130–140°F peak temperatures that degrade the resin binding fiberglass layers. Once delamination starts, glass particles enter the supply stream — homeowners often misdiagnose this as outdoor pollen allergies.
- Flex duct joint failures from humidity-cycled tape adhesive. Original foil tape used at flex duct joints loses adhesion under Kendall’s year-round humidity cycling, especially during June–November when outdoor relative humidity regularly exceeds 90%. The resulting leaks create negative pressure that pulls Everglades-origin mold spores directly into living spaces.
- Vapor barrier degradation behind duct liner surfaces. Aging duct insulation in 33156 homes allows humid attic air to contact duct metal; condensation forms between liner and duct wall, creating hidden mold colonies that spread until they compromise air quality or trigger respiratory symptoms.
- Inner liner collapse in original flex duct runs. After 35–50 years of thermal and humidity stress, the spiral wire support in original flex duct corrodes or the inner liner tears, causing duct sections to collapse and restrict airflow — often noticed first as weak supply at distant registers in Kendall’s larger floor plans.
Pricing for Duct Repair & Sealing in Kendall, FL
| Service | Typical Range in Kendall |
|---|---|
| Mastic sealant application (whole system) | $180 – $340 |
| Flex duct section replacement (per run) | $220 – $480 |
| Duct board repair or patch | $280 – $520 |
| Metal duct seam repair/re-sealing | $200 – $400 |
| Duct insulation replacement (per run) | $180 – $350 |
| Full system inspection with pressure test | $150 – $250 |
Kendall pricing runs toward the higher end of South Florida ranges for two reasons: the larger floor plans typical of this suburb mean more linear feet of ductwork per job, and the 1975–1988 housing stock often requires more extensive remediation than newer construction. We quote upfront after inspection — no open-ended billing. Every estimate includes a clear scope: what we’re repairing, what we’re replacing, and what condition we’re leaving the system in. Call (833) 628-3661 for a free estimate; we’ll inspect your ductwork and give you a firm number.
We Also Serve Cities Near Kendall
We regularly travel from our Miami base to Pinecrest, Glenvar Heights, South Miami, and Cutler for duct repair and sealing calls. Each of these markets has distinct housing stock and climate exposure — Pinecrest’s older estate homes present different challenges than Cutler’s 1990s construction — but Kendall’s specific combination of 1970s–80s flex duct, extreme attic temperatures, and Everglades biological load remains the most demanding duct repair environment we serve in southern Miami-Dade.
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
Kendall’s combination of 130–140°F unconditioned attic temperatures, 90%+ rainy-season humidity, and Everglades-origin biological load degrades duct materials faster than in coastal or northern Miami-Dade markets. Tape adhesives fail, insulation vapor barriers break down, and mold colonizes behind liner surfaces — all at accelerated rates. We use mastic instead of tape, specify humidity-rated insulation, and address microbial contamination as part of the repair. Call (833) 628-3661 for an inspection that identifies why your previous repairs didn’t hold.
Original fiberglass duct board from 1984 is now 40 years old and likely delaminating if it runs through your unconditioned attic. We inspect with borescope cameras to assess liner integrity; if delamination is active, replacement is the only permanent solution — sealing won’t stop glass particle release. In a 1983 home on SW 88th Street near the Kendall-Tamiami Cemetery, we found delamination so severe that fiberglass coated the supply registers; we extracted the contaminated sections, replaced them with insulated galvanized metal duct sealed with mastic, and installed an Aprilaire 5000 purifier to capture residual fibers. Call for a borescope inspection — estimates are free.
Proper mastic sealing eliminates the negative pressure that draws Everglades-origin mold spores into your duct system through leaks, but it won’t address mold already colonizing inside the ductwork. We typically combine sealing with Rotobrush mechanical cleaning and, where contamination is established, antimicrobial treatment. For homes near Kendall’s western edge closest to the wetlands, we also evaluate whether your return-air filtration is adequate for the biological load this location generates. Call (833) 628-3661 to discuss whether sealing alone or a combined approach fits your situation.
Given Kendall’s extreme thermal and humidity stress, we recommend professional duct inspection every 3–4 years for homes with original 1970s–1980s ductwork, and every 5 years for systems we’ve fully replaced or upgraded. Homeowners should check visible flex duct in attics annually for obvious tears, collapsed sections, or tape failure — but the hidden problems behind liner surfaces require borescope inspection. Call to schedule; we’ll note your home’s construction era and set an appropriate interval.
Yes — when the root cause is duct-related contamination. In Kendall specifically, we’ve seen allergy improvement within days after eliminating fiberglass particle release from delaminated duct board, sealing mold-spore entry points, and removing accumulated biofilm. The key is correct diagnosis: not all allergies are duct-related, but Kendall’s unique combination of aging fiberglass duct and Everglades biological load makes duct contamination a more likely culprit here than in most Miami suburbs. Our inspection identifies whether your symptoms correlate with duct conditions. Call (833) 628-3661 for a free evaluation.
Written by Michael Brown, Owner at Apex Air Duct Cleaning Service Miami, serving Kendall since 2013.