Fast, Reliable Duct Repair & Sealing Across Detroit
Duct repair and sealing in Detroit typically costs $180-$650 depending on whether we’re patching a single flex run or resealing an entire galvanized trunk system, and most jobs are completed in a single visit. If your bungalow or two-family flat near Gratiot or the North End has weak airflow, rooms that never warm up, or utility bills that climb every winter, the problem is often leaks in ductwork that hasn’t been touched since the Eisenhower administration.
We’ve been driving to Detroit from our dispatch for over 42 years, and we know the difference between a quick suburban fix and the kind of work these houses actually need. Our Duct Repair & Sealing crew carries mastic sealant, sheet-metal stock, and flex duct in standard diameters so we’re not making a second trip. Call (844) 685-6342 and we’ll answer - a live person, not a menu.
Why Bellows Air Duct & Vent Co. Is Detroit’s Preferred Duct Repair & Sealing Company
Detroit homeowners don’t call us because we’re the cheapest. They call because the last guy with a coupon showed up, taped a gap with duct tape, and the basement was 85 degrees while the second floor froze. We’re the square-deal alternative. One honest price shown before we start. Camera inspection before and after so you see what we see. And our 90-Day Done Right Promise in writing - if it’s not right, we make it right, no paperwork, no arguing.
Our technicians are background-checked, uniformed, and trained on Detroit’s specific housing stock: the octopus-furnace conversions, the galvanized trunks that run through plaster walls, the flex branches added during 1970s rehabs. We answer calls 24 hours a day, and we serve Detroit neighborhoods from the North End down to Jefferson-Chalmers. Most repairs are done same-day. We’ve built our reputation on never needing to be called back.
Our Duct Repair & Sealing Services in Detroit
Duct Sealing with Mastic Sealant
Mastic sealant is the only proper way to seal sheet-metal joints in Detroit’s aging systems. Duct tape fails in one season in a humid Detroit basement - we’ve peeled off rolls of the stuff that previous owners or flippers applied. We brush on water-based mastic at every trunk seam, register boot, and branch connection, then let it cure to a flexible, permanent seal. For a typical bungalow with 8-12 registers, full trunk sealing runs $340-$520. In Midtown and Corktown rehabs, we often find original 1950s mastic crumbled to dust; we strip and reapply so the system doesn’t hemorrhage heated air into the walls.
Metal Duct Repair
Detroit’s pre-WWII bungalows and two-family flats are full of original large-diameter galvanized trunk ducts that have gone 60-80+ years without proper attention. These weren’t built for forced-air blowers - they were gravity-fed “octopus” systems retrofitted with motors. The metal rusts through at floor registers where decades of condensation collect. We cut out rotted sections, fabricate replacement trunk from 26-gauge galvanized stock, and tie into existing branches with proper collars and mastic. A section replacement runs $280-$450. Where the trunk is sound but leaking at seams, we seal in place and save you the cost of full replacement.
Flex Duct Repair
Flex duct gets chewed. In Detroit’s vacancy-era homes, it’s almost guaranteed. Squirrels, raccoons, and rats got into unsecured properties by the thousands after 2008 and nested in the soft, warm flex runs between floors. We replace collapsed or chewed flex with insulated, reinforced duct, properly strapped and sealed to the trunk. A single branch replacement is $180-$290. We also find flex that was never properly connected during quick-flip rehabs - just jammed onto a collar and left. That gets fixed right.
Duct Insulation and Air Leak Repair
Uninsulated or poorly insulated ducts in Detroit’s unconditioned basements and crawl spaces lose massive heat before air ever reaches the register. When it’s below 20°F for days at a stretch - standard Detroit winter - that loss becomes the difference between a comfortable upstairs and a furnace that runs constantly. We wrap accessible trunk lines with formaldehyde-free fiberglass insulation, seal all air leaks with mastic, and verify with camera inspection that air is going where it’s supposed to. Full basement trunk insulation runs $420-$680 depending on linear footage.
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 Detroit
We stock parts and specify equipment from the brands serious HVAC contractors trust: Rotobrush for mechanical agitation and vacuum systems, Abatement Technologies for containment and HEPA filtration on contamination jobs, and Aprilaire for whole-home humidifiers and fresh-air ventilators we often integrate after sealing a leaky system. We don’t show up hoping we have what your house needs. Our trucks carry galvanized sheet metal in standard widths, mastic in 1-gallon and 5-gallon pails, insulated flex duct in 4-inch through 12-inch diameters, and proper collars, dampers, and register boots. For Detroit’s older housing stock, parts availability matters. We’ve seen too many jobs stall because a technician didn’t bring 10-inch galvanized or the right diameter flex for a 1925 flat. That doesn’t happen with us.
Common Duct Repair & Sealing Problems We See in Detroit Homes
- Original sheet-metal trunks rust through at floor registers after decades of condensation, creating invisible air leaks that waste 30% or more of heated air. Homeowners crank the thermostat and wonder why the second floor never warms. We find these with camera inspection and seal or replace the affected section.
- Mastic tape and duct tape applied during quick-flip rehabs fails within one season in Detroit’s humid basements, causing branches to separate from the main trunk. The tape looks fine in October. By January, heated air is pouring into the joist bay. We remove it all and apply proper mastic.
- Post-vacancy ductwork contains compressed layers of asbestos-insulation debris and nesting material that, when disturbed by improper cleaning, release fibers into living spaces. We assess before we agitate. If we suspect asbestos, we stop and advise on proper abatement protocol. We don’t blow that stuff through your house.
- Octopus-furnace conversions left oversized trunks with inadequate return-air pathways, starving the blower for air and creating negative pressure that pulls garage fumes, radon, and attic dust into living spaces. We add return capacity where possible and seal the supply side so the system breathes properly.
Pricing for Duct Repair & Sealing in Detroit, MI
We’re upfront about numbers because nobody likes a surprise on the invoice. Here’s what duct repair and sealing costs in Detroit’s market:
- Single flex duct branch repair/replacement: $180-$290
- Mastic sealing of trunk seams and register boots (typical bungalow): $340-$520
- Galvanized metal trunk section replacement: $280-$450
- Full basement trunk insulation wrap: $420-$680
- Air leak detection and spot sealing (camera-verified): $220-$380
- Contamination remediation with HEPA containment: $580-$940
What moves the price: accessibility (crawl space vs. full basement), extent of rust or rodent damage, whether asbestos is present and requires abatement referral, and whether the job is emergency service during heating season. We show you the price before we lift a tool. No bait coupons, no changes at the door. Mention this page and we’ll apply our standing $50 Off Any Repair Over $250. Seniors and veterans receive a permanent 5% discount. Call (844) 685-6342 for a free estimate - we’ll give you an exact number after we look.
We Also Serve Cities Near Detroit
Our service radius covers the full metro, and we regularly run to Dearborn for brick colonial ductwork, Lincoln Park for postwar ranch sealing, Warren for mid-century metal trunk repair, and Madison Heights for split-level flex duct replacement. Each city has its own housing stock and its own typical failure modes. We know the difference.
Serving Detroit, MI - Our Local Coverage Area
We’re based in the Detroit 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 Detroit
You can’t tell by looking, and disturbing suspected asbestos releases fibers. If your basement mechanicals have deteriorated white or gray fibrous wrapping on ducts or pipes, stop and call us for assessment. We’ll camera-inspect first and, if we suspect asbestos, refer you to a licensed abatement contractor before we proceed. Don’t let anyone vacuum or brush those ducts until you know. Call (844) 685-6342 and we’ll walk you through what to check safely.
Often yes, if the metal is intact and the leaks are at seams, collars, and register boots. We camera-inspect to assess rust penetration. Surface rust gets cleaned and sealed. Holes or through-rust at floor registers require section replacement. Sealing a sound trunk runs $340-$520; replacing rotted sections adds $280-$450 per area. We’ll show you the camera footage and give you both options. Call for a free estimate.
Leaky trunk lines in unconditioned basement or crawl space, plus insufficient insulation, bleed heat before it reaches upstairs registers. Detroit’s sustained subzero stretches expose every gap. We seal with mastic, insulate accessible trunk, and verify with before-and-after camera that airflow and temperature at each register improve. Most fixes are single-visit. Call (844) 685-6342 - we’ll diagnose it properly.
Yes, and in Detroit’s vacancy-era homes, we do it regularly. We remove the damaged flex, inspect the full run for additional nesting or contamination, replace with insulated reinforced duct, and seal properly to the trunk. Single branch: $180-$290. If we find heavy contamination, we discuss HEPA-contained remediation before reconnecting. Call for an exact quote after we look inside.
Usually both. Quick flips often add or move walls without resizing ducts, and they rarely seal properly. We measure static pressure, camera the full system, and identify where design fails (undersized branches, missing returns) versus where damage exists (separated flex, chewed runs, collapsed insulation). Then we quote exactly what it takes to fix. Our Free Second Opinion on Any Written Estimate applies if you’ve already been quoted. Call (844) 685-6342.
Ready to stop heating your basement and start heating your home? Call Bellows Air Duct & Vent Co. at (844) 685-6342. We’ll answer live, schedule a free estimate at your Detroit home, and show up when we say. One honest price before we start. Camera verification after we’re done. And our 90-Day Done Right Promise in writing - we stand behind it, no paperwork, no arguing.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Detroit since 1984.