Duct Sealing in Burien - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Burien

Duct sealing in Burien typically runs $450 – $1,200 for a whole-home system, and most jobs are scheduled within a few business days. If you live in a mid-century rambler or split-level around Three Tree Point, Seahurst, or Gregory Heights, your original galvanized ductwork is likely dealing with the same moisture problems we’ve been fixing here since 2004.

Call (361) 326-5060

We’re Hollis Air Duct Cleaning, part of the Garrison Partners family, and our Duct Sealing in Burien crews know this town’s housing stock. Dispatch and scheduling run through our Seattle office, but the technicians who show up at your door serve Burien locally. They understand that Burien’s wet marine climate, 38-plus inches of annual rainfall, and persistent indoor humidity above 60% create duct failure modes you simply don’t see in drier cities east of the Cascades. When your floor registers smell musty every time the furnace kicks on, that’s not a generic duct problem. It’s a Burien problem. Call us at (361) 326-5060 for a free estimate.

Why Hollis Air Duct Cleaning Is Burien’s Preferred Duct Sealing Company

We’ve built our reputation in Burien by showing up when we said we would, pricing the job in writing before we touch anything, and standing behind the work for a full year. The Garrison Standard requires it. Our 365-Day Done Right Promise means if the seal fails or the musty smell returns, we come back and make it right at no charge, including a free second visit.

Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. And when you call (361) 326-5060, a live person answers the phone, 24 hours a day, seven days a week. No voicemail loops. No callback queues. No waiting until Monday to schedule.

We use professional-grade equipment: Rotobrush rotary brush systems, Nikro negative-air machines, and sealing products from Guardsman and Abatement Technologies. These are the same tools commercial crews use, not hardware-store gear. We explain what we’re doing and why, in plain terms, on every job.

HVAC Duct Sealing in Burien

HVAC Duct Sealing in Burien is often the real fix behind persistent musty odors and uneven heating in mid-century homes. The job involves finding every leak, gap, and failed joint in your duct system, then sealing them with mastic and foil tape rated for the temperature swings and moisture levels your ducts actually see. In Burien’s 1940s – 1960s ramblers, we regularly find original galvanized steel joints that have rusted open from decades of internal condensation. Sealing those joints properly stops the crawlspace air, mold spores, and humidity from being pulled straight into your living space.

Most whole-home duct sealing jobs in Burien fall between $450 and $1,200, depending on system size, accessibility, and how much of the original ductwork needs attention. A straightforward seal of accessible joints in a 1,200-square-foot rambler runs toward the lower end. A full system with multiple disconnected runs, rusted sections, and wet interior insulation needing removal before sealing runs higher. We write the price down before any work starts. It does not move at the door.

When Sealing Becomes Essential

You’ll know it’s time when one room stays cold while the rest of the house heats fine, or when your energy bills climb without explanation. In Burien, add the musty register smell to that list. That’s moisture in the ducts, and sealing without addressing the source just traps it inside.

What the Process Looks Like

We start with a camera inspection of the full system, especially the return ducts where condensation pools. Then we remove any wet or mold-contaminated interior insulation, clean the bare metal with agitation tools under negative-air pressure and HEPA filtration, and seal every joint and seam with Guardsman mastic and foil tape. The result is a sealed system that moves conditioned air, not crawlspace damp.

Duct Repair in Burien

Duct Repair in Burien often goes hand-in-hand with sealing because the same moisture that opens joints also rusts through metal, crushes flexible runs, and destroys interior insulation. Repair means replacing rusted sections, reconnecting separated runs, and rebuilding duct paths so the sealing actually holds. A disconnected supply duct under a Burien crawlspace isn’t just leaking air; it’s actively drawing humid crawlspace air into your system every time the blower runs.

Single-section repairs in Burien typically run $200 – $500. More extensive work, multiple disconnected runs, or replacing failed interior insulation across the system can reach $800 – $1,500. We inspect with cameras before quoting, so you know exactly what needs fixing and what it costs before we start.

Rusted Galvanized Sections

Original galvanized steel in Burien’s mid-century homes rusts from the inside out where condensation sits. We cut out the failed section, fabricate a replacement from proper sheet metal, and seal it into the existing run with mastic and mechanical fasteners. Tape alone won’t hold on rusted metal.

Disconnected and Crushed Runs

Crawlspace work in Burien often reveals runs that have separated at joints or been crushed by decades of maintenance traffic. We reconnect with proper fittings, support the duct to prevent future sagging, and seal every connection. A crushed return duct in a damp crawlspace is a mold highway straight into your air handler.

Trusted Brands We Service in Burien

We seal and repair duct systems connected to all major HVAC brands, and we stock sealing materials and replacement fittings locally so Burien customers aren’t waiting on shipped parts. Our equipment roster includes Rotobrush rotary brush systems for thorough interior cleaning, Nikro negative-air machines that maintain proper containment during the job, and sealing products from Guardsman and Abatement Technologies. We also offer Burien Dryer Vent Cleaning to keep your whole ventilation system safe. For filtration upgrades after sealing, we carry Honeywell and Aprilaire products. Fast turnaround matters when your ducts are open and the heating season is here.

Common Duct Sealing Problems We See in Burien Homes

• Rusted galvanized joints in original 1950s ductwork. Burien’s marine climate keeps indoor humidity high enough that condensation forms inside metal ducts, especially at low points and floor registers. Over decades, this rusts through the original galvanized coating and opens joints that tape alone cannot seal.
• Wet, deteriorating interior insulation trapping mold. The loose fiberglass liner inside many mid-century ducts acts like a sponge in Burien’s damp air. Sealing over it without removing the wet material just encapsulates mold inside the system.
• Disconnected runs pulling crawlspace humidity into supply ducts. Camera inspections in Burien crawlspaces regularly find separated joints where the duct has pulled away from the boot or trunk line. Every heating cycle draws unconditioned, humid crawlspace air straight into the living space.
• Standing condensation at floor registers after wet winters. In Three Tree Point and Seahurst, we see this every spring. Cold air moving through warm, humid wall cavities condenses at the metal register boot, creating a mildew reservoir that smells every time the system runs.

Pricing for Duct Sealing in Burien, WA

We Also Serve Cities Near Burien

Our Duct Sealing crews also work in Burien‘s neighboring communities: Seattle, Spokane, Tacoma, and Vancouver. Each location operates under The Garrison Standard with independently owned crews, the same written pricing, and the same 365-Day Done Right Promise.

FAQs About Duct Sealing in Burien