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 Orinda
Duct sealing in Orinda typically runs $1,200 – $2,800 for a whole-house seal on mid-century ranchers and split-levels, with post-storm recovery work starting around $800 when sections can be salvaged. Our crews dispatch from the San Francisco Bay Area office and carry mastic, mesh, and camera inspection gear to hillside lots off Moraga Way, Camino Pablo, and the canyon roads above Orinda Country Club. If your returns took on water after a blocked drain backed up, or you’re losing conditioned air through original 1970s galvanized joints, we’ll inspect, document, and price it in writing before we touch anything. Call (361) 326-5060.
Why Hollis Air Duct Cleaning Is Orinda’s Preferred Duct Sealing Company
We’ve been working the Lamorinda hills since 2004, and Orinda’s mix of flex-duct retrofits and original galvanized trunk lines is familiar territory for our Duct Sealing team. Roy Castellanos built this operation on The Garrison Standard: written prices, written guarantees, and technicians who arrive inside the window, in uniform, with background checks already done.
Orinda homeowners call us back because we document what we find. Camera inspection footage, moisture readings, before-and-after photos of your own ducts – not stock images. That documentation matters when you’re filing with a WUI-zone insurer after water intrusion, and it’s why our 365-Day Done Right Promise includes a free second visit if the seal fails.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops. No waiting until Monday to schedule.
Duct Insulation in Orinda
Duct Insulation in Orinda addresses a specific problem: conditioned air bleeding through thin or degraded duct wrap before it reaches rooms on your home’s downhill side. In Orinda’s 1970s split-levels, we regularly find original fiberglass blanket insulation compressed to R-2 or R-3, far below current Title 24 standards, with vapor barriers torn where critters have accessed crawl spaces off hillside lots.
A typical Duct Insulation job in Orinda runs $900 – $1,800 for material and labor to re-wrap accessible trunk lines and replace damaged flex-duct sections. We use professional-grade materials from Abatement Technologies and Guardsman, specified to your system’s temperature differential and the Bay Area’s marine climate.
When Re-Insulation Beats Replacement
If your galvanized trunk line is structurally sound but the wrap is degraded, we can clean, seal with mastic, and re-insulate in place. This saves $400 – $800 versus full replacement and preserves original routing in tight hillside crawl spaces where new ductwork won’t fit without structural modification.
Vapor Barrier Integrity in Canyon Homes
Orinda’s winter rains and summer Diablo Winds create real pressure on vapor barriers. We specify reinforced foil-faced products with sealed seams, not the staple-and-tape method that fails within two seasons on exposed hillside runs.
HVAC Duct Sealing in Orinda
HVAC Duct Sealing in Orinda closes the gaps, cracks, and failed joints that pull unconditioned air into your system and push heated or cooled air into attics and crawl spaces. On the 1970s ranchers common around Orinda Country Club and the canyon neighborhoods above Camino Pablo, we typically find 15 – 30% air loss through original galvanized joints that have worked loose with decades of thermal cycling and hillside soil movement.
A whole-house HVAC Duct Sealing in Orinda runs $1,200 – $2,800 depending on system size, access difficulty, and whether we’re sealing accessible joints or chasing leaks through finished walls. We use mastic and fiberglass mesh on metal duct, proper mechanical fasteners on flex-duct connections, and never pressure-sensitive tape that fails with seasonal flex.
Post-Storm Recovery Protocol
After water intrusion, we camera-inspect before we seal. Sealing over wet or rusted galvanized joints traps moisture and accelerates internal corrosion. Our techs document moisture readings and corrosion patterns so your insurer sees why replacement was necessary on some runs and sealing sufficient on others.
WUI Fire-Defense Sealing
Orinda’s Wildland-Urban Interface rules treat duct sealing as part of the home’s fire-defense envelope. A leaking return in a canyon home pulls ember-laden air straight into living spaces during Diablo Wind events. We seal to California Fire Code standards, not just comfort standards, using products rated for the temperature and pressure cycles of wildfire smoke intrusion.
Trusted Brands We Service in Orinda
We stock parts and materials from Aprilaire, Abatement Technologies, Guardsman, and Rotobrush for Orinda jobs, which means no waiting on Bay Area supply house delivery when your system needs attention during fire season or after a storm. Our Nikro negative-air machines and HEPA filtration systems are the same units commercial crews use in hospitals and schools – not hardware-store gear that loses suction halfway through a hillside crawl space. When we specify a product for your Orinda home, we explain what it does in plain terms and why we chose it for your specific duct configuration and exposure.
Common Duct Sealing Problems We See in Orinda Homes
- Galvanized trunk line corrosion in 1970s ranchers. Most Orinda homes built in the 1960s and 1970s carry original galvanized steel trunk lines now 40 – 50 years old. Internal corrosion at low points, especially after water intrusion, turns these into leak sources that tape can’t fix – only replacement or proper mastic-and-mesh sealing on sound sections.
- Flex-duct separation at hillside connections. Seasonal soil movement off Camino Pablo and Moraga Way flexes duct runs seasonally. Pressure-sensitive tape fails within months; we find properly secured mechanical connections with mastic backup last years.
- Return leaks pulling wildfire smoke and pollen. Orinda’s canyon homes see heavy oak pollen each spring and smoke infiltration during fall Diablo Wind events. A leaking return in a WUI-zone home doesn’t waste energy – it actively compromises indoor air quality during the events that matter most.
- Standing water in low-lying duct after blocked drain backups. Hillside lots with inadequate drainage send water into crawl spaces during atmospheric rivers. We find original galvanized low points holding moisture that accelerates corrosion and, if sealed over without inspection, creates mold conditions documented by moisture meters.
Pricing for Duct Sealing in Orinda, CA
Duct sealing in Orinda runs $1,200 – $2,800 for whole-house work on typical mid-century to 1970s homes, with smaller targeted repairs starting at $600. Post-storm recovery where camera inspection, documentation, and partial replacement are involved typically falls in the $800 – $2,200 range depending on how many runs were compromised. Duct Insulation adds $900 – $1,800 when re-wrapping accessible trunk lines.
What moves the price: system size, crawl space accessibility on hillside lots, extent of corrosion or water damage, and whether we’re sealing accessible joints or opening finished areas. We give one flat price per system, agreed in writing, before any work starts. No per-vent pricing. No invoice that balloons once the van is in your driveway. Estimates are free. Call (361) 326-5060.
We Also Serve Cities Near Orinda
Our crews run the full Lamorinda corridor and adjacent hills. We handle Duct Sealing in Orinda plus Lafayette, Moraga, Piedmont, and Walnut Creek with the same written-price, written-guarantee standard. Each job gets the same equipment roster and the same 365-Day Done Right Promise, whether it’s a canyon home off Moraga Way or a flat-land ranch near Walnut Creek BART.
Serving Orinda, CA - Our Local Coverage Area
We’re based in the Orinda 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 Orinda
It depends on what camera inspection and moisture readings show. Flex-duct with surface moisture and no structural damage can be source-removed under negative-air HEPA filtration, dried, and resealed. Galvanized trunk lines with standing water and internal corrosion need replacement – sealing over rust traps moisture and accelerates decay. We document both conditions with photos and meter readings so your insurer sees the difference. Call (361) 326-5060 for a free inspection.
Yes. Orinda’s Wildland-Urban Interface rules treat duct sealing and filtration as part of the home’s fire-defense envelope, a framing absent in neighboring Lamorinda towns with less hillside exposure. A leaking return pulls ember-laden air directly into living space during Diablo Wind events. We seal to California Fire Code standards using mastic and mesh rated for wildfire temperature and pressure cycles, not just comfort standards. The 365-Day Done Right Promise covers seal integrity for a full year.
We run camera inspection, take moisture readings at multiple points, and photograph before-and-after conditions of your own ducts – not stock images. Our post-storm protocol specifies which runs show corrosion versus cleanable contamination, with written findings you can submit directly to your adjuster. We ran a call off Moraga Way where a 1970s galvanized trunk line had taken on water after a blocked hillside drain backed up during an atmospheric river. Our tech confirmed the flex-duct retrofit was salvageable but two return runs had standing moisture and internal corrosion. We source-removed the affected runs under negative pressure with HEPA filtration, sealed the surviving trunk with mastic and mesh, and re-insulated the air handler run. The insurer approved replacement on the two compromised returns because our documentation showed corrosion, not just dust.
For Orinda’s canyon homes with documented smoke intrusion, we typically specify MERV 13 or higher during and immediately after wildfire events, stepping down to MERV 11 for normal operations to balance filtration with system airflow. The rating matters less than the seal integrity – a MERV 16 filter in a leaky return still pulls unfiltered air around the edges. We assess your system’s blower capacity and duct tightness before recommending a filter upgrade. Call (361) 326-5060 and we’ll check both.
Hillside soil movement. Orinda’s homes on sloped lots off Camino Pablo and Moraga Way experience seasonal soil expansion and contraction that flexes duct runs and works joints loose. A wet winter saturates hillside soils, which then shrink in summer – more movement than flat-land towns like Danville see in a decade. Combined with 40 – 50-year-old galvanized trunk lines, that flex turns small leaks into major losses within a single season. We specify mechanical connections with mastic backup, not tape, for this exact reason.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Orinda since 2004.