Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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AfterFast, Reliable Duct Sealing Across Alameda
We dispatch to Alameda from our San Francisco Bay Area office, and most calls get a next-day or two-day appointment. If you’re in the Gold Coast, South Shore, or the bungalow neighborhoods off Central Avenue, we know the ductwork you’re dealing with: original galvanized steel, decades of salt-laden marine air, and the white powder that signals corrosion underneath. Call us at (361) 326-5060 for a free estimate. We’ll show up in the window we promised, price the job in writing before we touch anything, and stand behind it for a full year.
Why Hollis Air Duct Cleaning Is Alameda’s Preferred Duct Sealing Company
We’ve been doing this since 2004 as part of the Garrison Partners family, and our Alameda customers stay with us because we treat their pre-1960 homes like the specific machines they are. The 365-Day Done Right Promise means if our seal fails, we come back and make it right at no charge, including a free second visit. Our technicians are background-checked, uniformed, and trained to The Garrison Code: arrive inside the window, price in writing, work by the book, leave the site clean. Phones are answered by a live person 24 hours a day, seven days a week. No voicemail loops. No callback queues.
Air Duct Sealing in Alameda
Air Duct Sealing in Alameda is a corrosion-control job first, an efficiency upgrade second. The persistent marine layer and salt-laden bay breezes that make Alameda pleasant to live in also deposit corrosive salt inside ductwork. In pre-1960 bungalows and Victorians with original galvanized steel ducts, that salt crystallizes into white powder that accelerates rust and pitting. Sealing over that corrosion without treating it first is a waste of money; the sealant lifts within months as the metal continues to degrade underneath. We treat the root problem, then seal.
A typical Air Duct Sealing job in Alameda runs $450 – $1,200 for a single-system home, depending on accessibility, the extent of corrosion damage, and whether we need to reconnect crushed or disconnected runs. Two-system homes or jobs requiring extensive mastic and mesh work in tight crawlspaces run $1,200 – $2,100. Every price is written down before we start. It does not move at the door.
What We Find in Older Alameda Homes
Camera inspection almost always reveals crushed galvanized runs behind kitchen walls, disconnected supply boots feeding hallways instead of bedrooms, and joints where standard foil tape has failed after one season of marine-layer humidity. We document everything with photos before and after. You’ll see exactly what we sealed and why.
Corrosion Inhibitor Before Sealant
On Alameda’s Gold Coast, original galvanized ducts develop salt crystal buildup that looks like white powder. After cleaning with Rotobrush agitation under negative-air pressure, we apply a corrosion-inhibiting treatment before any mastic or mesh goes on. Without this step, the pitted steel re-rusts within months because Alameda’s humidity never drops low enough to dry it completely.
Duct Sealing Services in Alameda
Duct Sealing Services in Alameda cover supply and return trunk lines, branch runs, plenum connections, and register boots using mastic and fiberglass mesh for permanent joints, plus mechanical fasteners where code requires them. We do not use foil tape on original galvanized steel in this climate; the adhesive degrades too fast. Our crews carry professional-grade equipment from Rotobrush and Nikro, plus corrosion inhibitors and sealants rated for high-humidity coastal environments.
Most Alameda homeowners call us for Duct Sealing Services after noticing uneven heating, musty odors in specific rooms, or energy bills that climbed without explanation. Sometimes our Duct Sealing team finds the problem during a routine duct cleaning: a disconnected run pulling attic air into the bedroom, or a crushed branch behind a wall that no amount of cleaning will fix.
Camera Inspection and Documentation
We run a borescope through every accessible register before quoting. In a 1925 bungalow off Central Avenue near the Gold Coast, we found a crushed galvanized run behind the kitchen wall, white salt powder coating every joint, and a disconnected supply boot feeding the hallway. Camera inspection prevents us from sealing a system that still has hidden disconnects.
Static Pressure Testing After Sealing
We measure supply and return static pressure before and after sealing. The numbers tell us whether we’ve actually fixed the leaks or just patched the obvious ones. In that Central Avenue bungalow, pressure dropped and the bedroom stopped smelling like the bay. We show you the readings.
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 Alameda
We stock parts and filtration products from Aprilaire, Abatement Technologies, and Guardsman for Alameda customers, with fast turnaround on common fittings and register boots. Our equipment roster includes Rotobrush rotary brush systems for agitation cleaning and Nikro negative-air machines for containment. These are the same tools commercial crews use, not hardware-store gear. For high-humidity coastal environments like Alameda’s, we specify sealants and corrosion inhibitors that hold up where standard products fail. If your system uses Honeywell or Aprilaire filtration components, we match and install them to manufacturer spec.
Common Duct Sealing Problems We See in Alameda Homes
- Sealing over salt-crusted galvanized steel in pre-1960 bungalows. The sealant lifts as corrosion continues underneath because the white salt powder wasn’t neutralized first. We clean, treat with corrosion inhibitor, then seal.
- Standard foil tape on original duct joints exposed to marine-layer humidity. The adhesive fails within a season and the joint leaks worse than before. We use mastic and mesh for permanent seals.
- Disconnected runs hidden behind plaster walls. We only find them with camera inspection. A sealed system with a disconnected branch still pulls attic or crawlspace air into the supply side. We locate and reconnect before sealing.
- Salt crystal buildup in Gold Coast historic homes. The white powder accelerates pitting. Technicians must use corrosion-inhibiting treatments after cleaning to prevent rapid re-rusting before any sealant application.
Pricing for Duct Sealing in Alameda, CA
A typical duct sealing job in Alameda runs $450 – $1,200 for a single-system home with accessible ductwork in basement or crawlspace. Two-system homes, extensive corrosion repair, or jobs requiring access through plaster walls run $1,200 – $2,100. What moves the price: the number of supply and return runs, accessibility (tight crawlspaces take longer), whether we need to reconnect or replace crushed sections, and whether corrosion inhibitor treatment is required before sealing. We do not quote per-vent prices. One flat price per system, agreed in writing before work starts. Estimates are free. Call (361) 326-5060.
We Also Serve Cities Near Alameda
Our crews work throughout the East Bay, including Oakland, Piedmont, Emeryville, and Berkeley. Each home gets the same written price, the same 365-Day Done Right Promise, and the same background-checked, uniformed technicians. Scheduling is coordinated from our San Francisco Bay Area office.
Serving Alameda, CA - Our Local Coverage Area
We’re based in the Alameda 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 About Duct Sealing in Alameda
It’s salt crystal buildup from Alameda’s marine-layer air. The bay breezes carry salt inland, and when humidity stays high, that salt deposits inside galvanized steel ducts and crystallizes. The white powder accelerates rust and pitting, and it must be neutralized with a corrosion inhibitor before any sealant goes on, or the seal will fail within months. Call (361) 326-5060 for an inspection and exact quote.
Often yes. We access ducts through existing registers and use flexible borescopes to inspect behind walls. If the damage is in accessible basement or crawlspace runs, we seal those directly. When a run is crushed behind plaster, we may need limited access, but we document everything with photos and explain your options before cutting anything. Estimates are free.
Alameda’s persistent marine-layer humidity keeps metal ducts wet enough to accelerate corrosion, and it degrades standard foil-tape adhesive within one season. That’s why we use mastic and mesh on galvanized steel, and why we apply corrosion inhibitor before sealing. The humidity also promotes mold growth in poorly ventilated systems, so we inspect for that during every sealing job.
Flex duct in newer Alameda waterfront condos has different failure modes. The plastic liner traps salt particles and can develop micro-leaks at connection points, while the insulation sleeve holds moisture against metal collars. We inspect with cameras, seal collar connections with proper mastic, and replace flex runs where the inner liner has degraded. The corrosion inhibitor step is usually unnecessary on flex, but the salt still matters.
Cleaning fixes dust, debris, and mold buildup. Sealing fixes leaks, disconnections, and pressure loss. If one room stays cold while others heat fine, if you smell musty air in specific areas, or if your energy bills spiked without explanation, you likely have leaks that cleaning won’t fix. We run a camera inspection and static pressure test to tell you which problem you actually have. Call (361) 326-5060 to schedule.
Ready to stop losing heated air into your walls and crawlspace? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free estimate. We’ll inspect your Alameda home’s ducts with cameras, explain what we find in plain terms, and give you a written price before any work starts. Every job is backed by our 365-Day Done Right Promise: if it’s not right, we make it right at no charge, including a free second visit. Background-checked, uniformed technicians. Live person answering the phone, day or night.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Alameda since 2004.