Fast, Reliable Duct Repair & Sealing Across Pontiac
Duct repair and sealing in Pontiac typically runs $280-$650 for most homes, with metal duct repair jobs averaging $340-$520 and full mastic sealing of an older system landing between $450-$780. We’re usually on-site in Pontiac within 24 hours, and most repairs finish in a single visit. Call (844) 685-6342 for a free estimate with upfront pricing.
We’ve been driving to Pontiac since 1984, long enough to know the difference between a routine duct sealing job and the remediation work this city actually needs. The post-war bungalows and small ranches built for GM Pontiac Assembly workers, many sitting in the 48340, 48341, and 48342 ZIP codes, carry galvanized sheet-metal ductwork that’s now 50 to 80 years old. These systems weren’t designed for modern forced-air efficiency, and too many sat uncleaned through multiple foreclosures during the 2008-2014 wave. When we get a call from a homeowner in Pontiac, we don’t assume standard wear. We bring a HEPA vacuum, a smoke machine for leak detection, and the expectation that we’ll find layered debris that air-wash methods alone won’t touch.
Our Duct Repair & Sealing crew knows Pontiac’s housing stock because we’ve worked inside it for decades. We understand the seasonal rhythm here: heating runs hard from November through March, then humid summers hit those same uninsulated basement and crawlspace ducts with condensation that accelerates rust and mold. That cycle is specific to southeast Michigan’s humid continental climate, and it shapes every repair decision we make.
Why Bellows Air Duct & Vent Co. Is Pontiac’s Preferred Duct Repair & Sealing Company
Pontiac homeowners call us because we’ve built a reputation on showing up when we say we will and leaving systems that stay sealed. Over 42 years, we’ve repaired ductwork in the older residential blocks off South Boulevard, in the bungalow courts near the former assembly plant footprint, and throughout the 48340 corridor where vacancy-related contamination is common. Our technicians are background-checked, uniformed, and equipped with Rotobrush and Nikro professional-grade tools, the same brands serious HVAC contractors specify.
We answer calls with a live person, 24 hours a day. No voicemail, no app. When a Pontiac homeowner calls (844) 685-6342, they reach someone who can dispatch a crew and explain pricing before a single tool is lifted. Our 90-Day Done Right Promise applies to every job: if the work isn’t right, we return at no charge with no paperwork required.
Ray Castillo, who leads Bellows Air Duct & Vent Co., set this standard from the start. The company was founded in 1984, named for the oldest air-moving tool there is, and built on the principle that a square deal means one honest price shown before work starts. We’ve never used bait coupons or scare tactics, and we don’t start now.
Our Duct Repair & Sealing Services in Pontiac
Metal Duct Repair
The galvanized sheet-metal ducts in Pontiac’s 1940s-1970s housing stock weren’t built to last 80 years, but many have. Rust perforations from decades of condensation in uninsulated crawlspaces and basements create air leaks that waste energy and pull contaminants into living spaces. We cut out corroded sections, fabricate replacement pieces on-site, and seal joints with proper mechanical fastening before applying mastic. In the 48340 corridor, where industrial-era particulate layers into vacancy debris, surface prep is critical. We HEPA-vacuum every section before repair so new metal bonds to clean metal, not grime.
Mastic Sealant Application
Mastic is the right sealant for Pontiac’s old metal ductwork, but only when applied correctly. We see too many failed jobs where crews smeared mastic over flaking rust or oily residue without cleaning first. In Pontiac’s high-humidity basements, that peels away within months. Our process: wire-brush to bare metal, HEPA-vacuum, apply Abatement Technologies-compatible mastic at proper thickness, then cure-test before closing. A properly prepped mastic seal on old galvanized duct in this climate lasts 10-15 years. A shortcut job fails before the first heating season ends.
Duct Insulation
Uninsulated duct runs in Pontiac basements and crawlspaces are where the damage starts. Winter heating sends warm air through cold metal; summer humidity condenses on the same surfaces. That cycle creates rust pinholes, mold colonization, and the air leaks we spend our days repairing. We insulate main trunk lines and critical branches with formaldehyde-free fiberglass wrap or closed-cell foam where space allows, depending on the specific configuration of your basement. For the retired GM workers and second-generation homeowners we serve in Pontiac, this is often the repair that prevents the next repair.
Flex Duct Repair
Some Pontiac homes have flex duct additions from later HVAC retrofits, often run through attics where squirrels and raccoons access from nearby trees. We replace crushed or chewed sections with properly sized flex, secure with mechanical ties rather than tape alone, and seal connections to metal trunks with mastic. Every repair gets a post-work camera inspection so you see the finished job, not just our word.
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 Pontiac
We stock parts and specify equipment from Rotobrush, Nikro, and Abatement Technologies, the brands that HVAC contractors trust for duct remediation in older housing stock. For Pontiac’s galvanized metal systems, we source compatible mastic and mechanical fasteners rather than forcing modern solutions onto vintage ductwork. Most repairs don’t require a return trip because we arrive with the right materials for 50-80-year-old systems. That matters in Pontiac, where a second trip means more time with compromised air quality and higher total cost.
Common Duct Repair & Sealing Problems We See in Pontiac Homes
- Layered vacancy debris in 48340 corridor ducts. Technicians using standard air-wash methods blow past heavy contamination without removing it. Mold spores and rodent nesting material remain, later failing new seals and contaminating indoor air. We HEPA-vacuum every section before sealing.
- Rust pinholes in uninsulated basement runs. These go undetected when crews skip smoke-machine leak testing. We flex-test with visible smoke to find every perforation, not just the obvious ones, so we seal the system that exists, not the one we assume.
- Failed mastic from poor surface prep. Mastic applied over flaking rust or oily grime peels within months in Pontiac’s humid summer basements. We wire-brush to bare metal and verify adhesion before closing any joint.
- Condensation damage from missing or degraded insulation. Original insulation on post-war ductwork has often crumbled or been removed. We assess every accessible run and recommend insulation where the cost of prevention beats the cost of repeated rust repair.
Pricing for Duct Repair & Sealing in Pontiac, MI
| Service | Typical Range in Pontiac |
|---|---|
| Basic mastic sealing (partial system) | $280-$420 |
| Full mastic seal of metal duct system | $450-$780 |
| Metal duct repair (section replacement) | $340-$520 |
| Duct insulation (main trunk line) | $380-$650 |
| Flex duct repair/replacement | $220-$390 |
| Smoke-machine leak detection | $150-$220 (often included with repair) |
These ranges reflect Pontiac’s specific market: older systems need more surface prep, more HEPA vacuuming, and more careful material matching than newer suburban construction. A home in the 48341 ZIP with original galvanized duct and foreclosure-history contamination sits at the higher end. A simpler flex duct repair in a 1970s ranch with clean access runs lower. We disclose your exact price before starting, and we honor our standing offers: $50 off any repair over $250, a free second opinion on any written estimate, and a permanent 5% senior and veteran discount.
Call (844) 685-6342 for a free estimate. We’ll inspect with a camera, explain what we find, and give you one honest price.
We Also Serve Cities Near Pontiac
Our crews regularly work Duct Repair & Sealing in Pontiac and the surrounding communities: Waterford, West Bloomfield Township, Troy, and Rochester Hills. Each city has different housing stock and different duct problems. Pontiac’s post-war worker housing and vacancy history create a remediation-focused market that we know specifically. If you’re in one of these neighboring cities, we apply the same upfront pricing and 90-Day Done Right Promise, with the appropriate local knowledge for your home’s age and construction.
Serving Pontiac, MI - Our Local Coverage Area
We’re based in the Pontiac 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 Pontiac
Because standard cleaning methods often don’t remove the layered debris unique to Pontiac’s foreclosure-history housing stock. Air-wash equipment blows past compacted industrial-era particulate and organic contamination from vacancy periods, leaving mold and rodent nesting material that later degrades new seals and contaminates air flow. We HEPA-vacuum and camera-verify removal before any sealing work. Call (844) 685-6342 if you’ve had a cleaning but still smell musty air or see energy bills climbing.
The South Boulevard corridor in the 48340 ZIP sits closer to the former GM Pontiac Assembly footprint, where decades of heavy manufacturing deposited industrial-era particulate into local housing. Combined with higher vacancy rates and repeated reoccupation without inspection, this creates layered contamination that standard methods miss. Waterford’s housing stock is newer on average, with less abandonment-related debris and more routine maintenance histories. We bring heavier remediation equipment to South Boulevard jobs. Call for a free inspection and we’ll show you what your specific system needs.
Yes, we replace damaged flex duct sections with properly sized new material, secure connections with mechanical ties and mastic, and inspect the full run for additional access points. Pontiac’s mature tree canopy and older home profiles create more attic access for wildlife than newer subdivisions. We also check adjacent metal trunk connections while we’re there. Call (844) 685-6342 for same-week service in most cases.
Properly applied mastic on clean, prepped galvanized metal lasts 10-15 years in Pontiac’s humid continental climate. The key is surface preparation: mastic applied over rust, oil, or grime fails within months, especially during summer humidity spikes in uninsulated basements. We wire-brush to bare metal, HEPA-vacuum, and verify adhesion before closing any joint. Our 90-Day Done Right Promise covers the workmanship; if it fails because we didn’t prep right, we return at no charge.
We seal accessible joints and can evaluate concealed runs using our smoke machine to detect leaks behind walls or in soffits. Pontiac’s post-war bungalows often have ductwork in finished basement ceilings or chases that limit access without drywall repair. When we find significant leakage in concealed areas, we explain the location, show you the smoke test results, and discuss options: targeted access for critical leaks, or sealing accessible portions and improving overall system pressure. We don’t open walls without your clear understanding of why and what it costs. Call (844) 685-6342 for a camera inspection and honest assessment.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Pontiac since 1984.