Duct Sealing in La Marque - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across La Marque

Most La Marque homeowners don’t realize their ducts are leaking until a utility bill spikes or a back bedroom won’t cool. Duct sealing in La Marque typically runs $450 – $1,200 for a whole-house seal on standard ranch-style homes, with full replacement of corroded galvanized sections reaching $1,800 – $3,500 when the original 1950s – 1970s metal has failed internally. Our crews dispatch from the Houston office and carry the mastic, foil tape, and mechanical fasteners needed for the older sheet-metal trunk lines common in neighborhoods off Bayou Road and around Highland Bayou Park.

Call (361) 326-5060

We’ve been working in La Marque long enough to know the difference between a quick joint seal and a system that’s too far gone. The Garrison Standard means we write the price before we touch anything, show up inside the window we quoted, and leave the attic cleaner than we found it. If you’re smelling refinery air inside your house or certain rooms never reach temperature, the ducts are the first place we look. Call (361) 326-5060 and we’ll get you scheduled.

Why Hollis Air Duct Cleaning Is La Marque’s Preferred Duct Sealing Company

Our reputation in La Marque was built on showing up for the jobs other companies walk away from: corroded galvanized trunks, attics that hit 140 degrees in July, and that grey-black film coating blower wheels that techs from The Woodlands have never seen. Roy Castellanos and our Duct Sealing team train to the same standard across every Garrison Partners location, but the crews serving La Marque know to inspect return plenums first because of what blows in from the Texas City Industrial Complex.

Customers here don’t call us for the lowest coupon price. They call because the last crew quoted $199, then handed them an $1,800 invoice at the door. We don’t work that way. The price is written down before any work starts, and it doesn’t move. Our 365-Day Done Right Promise covers every seal and replacement section in writing: if it fails within a year, we come back at no charge, including a free second visit. Background-checked, uniformed technicians arrive when scheduled, and phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops. No callback queues.

Duct Repair in La Marque

Duct Repair in La Marque usually starts with a camera inspection because the original galvanized sheet-metal runs in this city’s 1950s – 1970s ranch homes have decades of expansion and contraction damage from Gulf Coast humidity cycles. We find joints that have opened, seams rusted through from the inside, and branches crushed by storage or old insulation work. A typical repair on a partial system runs $350 – $850; when the trunk line itself has corroded, section replacement before sealing adds $900 – $1,800 to the total.

Disconnected Runs and Crushed Branches

On older La Marque homes, especially off Bayou Road and near the original Highland Bayou developments, we regularly find supply branches that have pulled completely off the trunk or been crushed by someone stepping through the attic years ago. The homeowner just knows the back bedroom is hot. We reconnect or replace the damaged section, seal with mastic rated for metal-to-metal joints, and pressure-test before we leave.

Internal Rust and Corrosion

Galvanized steel doesn’t rust from the outside in La Marque’s attics; it rusts from the inside where condensation meets the fine particulate that migrates through leaking joints. Once internal corrosion collapses a seam, mastic alone won’t hold. We cut out the failed section, fabricate replacement trunk from matching gauge, and seal the new work to the old with mechanical fasteners and two coats of mastic.

Air Duct Sealing in La Marque

Air Duct Sealing in La Marque is often the corrective step after duct cleaning reveals how much conditioned air has been leaking into attics and wall cavities for decades. A whole-house seal on a typical 1,200 – 2,000 square foot ranch runs $450 – $1,200, depending on access and how many joints need attention. We use mastic compounds and foil tapes rated for the temperature swings in unconditioned Gulf Coast attics, not the hardware-store duct tape that fails in one season.

Sealing Original Galvanized Systems

The unsealed sheet-metal ductwork in La Marque’s older neighborhoods was never designed to hold pressure the way modern systems do. We seal every longitudinal seam, every transverse joint, and every takeoff collar with brush-applied mastic that remains flexible through decades of thermal cycling. On a 1968 ranch off Bayou Road, our tech pulled a camera inspection through the return and found three disconnected galvanized runs in the attic plus a crushed branch feeding the back bedroom – the homeowner had been asking why the house smelled like the refinery. After negative pressure source removal with HEPA filtration, we rebuilt and sealed the failed joints and tied the system back to a Honeywell media cabinet at a higher MERV rating. The supply and return runs that had been leaking into the attic for decades finally held pressure, and the grey-black film stopped reappearing on the blower motor.

Flex Duct in Newer Subdivisions

Homes in the Columbia Memorial Parkway area and similar newer construction use flex duct, which performs differently. The sticky industrial fallout from the Texas City corridor loads the inner liner, and sagging flex pulls off collars at the plenum. We clean the collar and liner end before sealing, replace damaged flex sections with new insulated run, and secure with mechanical straps plus mastic – never just tape over contamination that will fail.

Trusted Brands We Service in La Marque

Our vans stock sealing mastics, foil tapes, and mechanical fasteners matched to the duct materials we encounter in La Marque, plus replacement components from Aprilaire, Abatement Technologies, and Guardsman filtration products. We carry Honeywell media cabinets and higher-MERV filters for homeowners upgrading their return filtration after sealing, because source capture matters when you’re downwind of industrial emissions. Rotobrush rotary systems and Nikro negative-air machines handle the cleaning phase before we seal. Parts on the truck mean most La Marque jobs finish in one visit, not two.

Common Duct Sealing Problems We See in La Marque Homes

• Original unsealed galvanized trunks. The 1950s – 1970s ranch stock throughout La Marque was built with sheet-metal ductwork that was never sealed at the joints. Decades of Gulf Coast humidity cycles have opened every longitudinal seam and takeoff collar, dumping conditioned air into the attic and pulling hot, contaminated attic air into the return.
• Internal corrosion from condensation and particulate. When refinery stack emissions migrate through leaking joints, they combine with attic condensation to corrode galvanized steel from the inside. The seam looks intact until you press it, then it crumbles. Mastic alone won’t fix this; the section needs replacement before any sealing will hold.
• Flex duct contamination and collar separation. In Columbia Memorial Parkway-area homes, the sticky fallout from the Texas City Industrial Complex coats the inner liner of flex duct, adding weight that sags the run and pulls it off the collar. Sealing over that contamination traps the film in place and guarantees failure within a season.
• Flood-damaged ductwork from Hurricane Ike and later events. Many La Marque homes took water in 2008. Ductwork that flooded and wasn’t replaced may have biological growth inside the insulation liner or rust at the joints. We inspect with a camera before recommending seal versus replacement, because sealing over mold or rust is a waste of your money.

Pricing for Duct Sealing in La Marque, TX

We Also Serve Cities Near La Marque

Our crews work throughout the Galveston Bay area, including Hitchcock, Texas City, Santa Fe, and Dickinson. Each home gets the same written price, same 365-Day Done Right Promise, same background-checked uniformed technician. If you’re in La Marque or any of these surrounding communities, we keep the same schedule and the same standard.

FAQs About Duct Sealing in La Marque