Fast, Reliable Duct Repair & Sealing Across Greatwood
Duct repair and sealing in Greatwood, TX typically costs between $180 and $650 depending on the scope, with most flex duct repairs and mastic sealing jobs completed same-day. If your home’s airflow feels weak, your energy bills have climbed, or you’re smelling mustiness from the vents, the problem is often degraded ductwork hiding in your attic.
We’re Lone Star Air Duct Cleaning Service Houston, and we know Greatwood’s homes inside and out. Owner Scott Gray personally leads our Duct Repair & Sealing crew on every job, and we’ve spent two decades working on the exact flex duct systems found throughout this master-planned community. From the streets off Greatwood Parkway to the Brazos-adjacent sections near the river corridor, we’re usually on-site within 45 minutes of your call. You can reach us at (855) 683-5929 for a free estimate.
Why Lone Star Air Duct Cleaning Service Houston Is Greatwood’s Preferred Duct Repair & Sealing Company
Greatwood homeowners don’t hire us for slick marketing. They hire us because Scott Gray shows up — not a rotating subcontractor, but the owner with 20 years of hands-on experience diagnosing and fixing duct systems exactly like theirs. Our 433 verified reviews average 4.9 stars, and a growing share of them come from right here in 77469, where neighbors tell neighbors which tradesman actually solves the problem instead of selling a quick patch.
We understand Greatwood’s concentrated housing stock: builder-grade suburban homes built almost entirely between the mid-1990s and mid-2000s, most with slab foundations and attic-mounted air handlers feeding long flex duct runs. That 20–30 year build window means entire neighborhoods are hitting duct failure at the same time. We know which streets sit lower toward the Brazos, which attics bake hottest in August, and which homes are most likely to still harbor post-Harvey contamination that was never properly addressed.
Our response time to Greatwood averages under 45 minutes during business hours. We carry Rotobrush camera systems, Nikro HEPA vacuums, and professional-grade mastic and insulation materials on every truck — no waiting for parts, no return trips.
Our Duct Repair & Sealing Services in Greatwood
Flex Duct Repair
Flex duct is the weak link in most Greatwood attics. The original builder-grade flex installed in the 1990s and 2000s degrades from the inside out — the inner liner cracks, the insulation compresses, and the plastic outer jacket becomes brittle. In Greatwood specifically, we’ve found that attic temperatures exceeding 130°F for eight months of near-continuous cooling season accelerate this breakdown dramatically. Connections pull apart at the collars. We cut out failed sections and splice in new flex with proper supports and sealed collars, matching the diameter and R-value of your existing runs. On a recent job in the Brazos-adjacent section of Greatwood, we used a Rotobrush camera to inspect a home’s flex duct runs and discovered post-Harvey silt still caked inside the return-air plenum. We sealed multiple leaks with mastic sealant and replaced a section of degraded flex duct that was pulling apart at the connection, restoring proper airflow and preventing future contamination.
Mastic Sealant Application
Brush-on mastic is the only proper way to seal duct joints and plenum connections in Greatwood’s climate. Foil tape dries out and fails within a couple of summers here. We apply thick, fiber-reinforced mastic to every joint, seam, and penetration, creating a permanent flexible seal that won’t crack as the ductwork expands and contracts through our extreme temperature swings. For homes with aging flex duct, mastic is especially critical at the transition points where flex meets metal trunk lines — the exact spots where Greatwood’s older systems are leaking conditioned air into attics.
Metal Duct Repair
Some Greatwood homes, particularly the larger builds near Greatwood Lakes, have hybrid systems with galvanized trunk lines and branch flex. The metal doesn’t fail as fast, but the seams do. We spot-weld separated seams, replace rusted sections, and re-seal with mastic. Where metal ducts pass through unconditioned spaces, we also address insulation gaps that cause condensation and mold.
Duct Insulation
Fort Bend County’s Gulf Coast humidity makes duct insulation non-negotiable. When cool air moves through poorly insulated flex duct in a 130°F attic, condensation forms on the exterior, soaks the fiberglass, and creates a mold factory inside your supply lines. We replace degraded insulation with fresh, properly sealed vapor-barrier jackets, and we add supplementary insulation wraps to trunk lines where the original has compressed or torn. This isn’t just an energy issue in Greatwood — it’s an air quality issue.
What happens when you call
- 1
A real person answersNo phone trees — you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Greatwood
We stock parts and materials from Honeywell, Aprilaire, and Guardsman for Greatwood customers who need integrated air quality solutions alongside their duct repairs. Our trucks carry Rotobrush rotary brush systems and Nikro HEPA vacuums for camera inspection and post-repair cleaning. For homes requiring whole-system remediation after flood damage or mold colonization, we deploy Abatement Technologies negative air machines and HEPA filtration. That means one crew, one visit, no waiting on specialty contractors.
Common Duct Repair & Sealing Problems We See in Greatwood Homes
- Flex duct connections separating in attic heat. Greatwood’s attics routinely hit 130°F+ for months at a stretch. The plastic wire ties and adhesive collars on original flex duct degrade until the connection simply pulls apart, dumping cooled air into your attic and pulling hot, humid attic air back into your system.
- Post-Harvey sediment and mold still circulating. Many Greatwood homes took floodwater in 2017. Owners who cleaned surface levels often never addressed the silt and organic debris that settled in return-air plenums and low-lying duct runs. We find it regularly with camera inspection — gray-brown sediment caked on duct walls, sometimes with active mold colonies behind it.
- Condensation-driven mold in supply lines. The combination of extreme attic heat and Fort Bend County’s relentless humidity creates perfect conditions for condensation on under-insulated flex duct. Homeowners smell mustiness when the AC first kicks on. The fix is proper insulation and sealing, not just air fresheners.
- Collapsed or crushed flex duct from foot traffic. Greatwood’s attic-mounted air handlers require technician access, and over 20+ years of filter changes and repairs, flex duct runs get stepped on, kinked, or partially collapsed. Restricted airflow forces your system to run longer, driving up bills and shortening equipment life.
Pricing for Duct Repair & Sealing in Greatwood, TX
Here’s what duct repair and sealing actually costs in Greatwood’s market:
| Service | Typical Range |
|---|---|
| Mastic sealant application (standard system) | $180 – $320 |
| Flex duct section replacement (per run) | $220 – $380 |
| Return-air plenum repair/rebuild | $340 – $550 |
| Duct insulation replacement (per run) | $160 – $290 |
| Full-system camera inspection with report | $150 – $225 |
Homes in the lower-elevation Brazos-adjacent sections of Greatwood often require more extensive remediation due to post-Harvey contamination, which can push repairs toward the higher end of these ranges. Multiple flex duct failures discovered during inspection may qualify for bundled pricing. We provide exact, itemized quotes before any work begins — call (855) 683-5929 for your free estimate.
We Also Serve Cities Near Greatwood
Our service radius covers all of Fort Bend County’s core communities. We regularly run duct repair and sealing calls in Rosenberg, Richmond, Sugar Land, and New Territory — often same-day when scheduling allows. If you’re in a neighboring community and dealing with aging flex duct, post-storm contamination, or humidity-driven mold, the same owner-led crew serves your area.
Serving Greatwood, TX — Our Local Coverage Area
We’re based in the Greatwood 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 Greatwood
Yes — if your home took floodwater and you never had a camera inspection of your return-air plenums and low-lying duct runs, you likely have residual sediment or mold. We find post-Harvey contamination in roughly half the Brazos-adjacent homes we inspect in Greatwood, even when owners believe prior cleaning was sufficient. Call (855) 683-5929 to schedule a camera inspection — estimates are free.
Builder-grade flex duct in Greatwood’s attic conditions typically lasts 20–25 years, meaning most of this community’s housing stock is at or past replacement age. If your home was built between 1995 and 2005 and still has original flex duct, plan for section replacement or full replacement within the next few years. We can assess remaining life with camera inspection and airflow testing.
Mastic seals joints and connections effectively even on older flex duct, but it cannot restore cracked inner liners or compressed insulation. We use mastic as part of a repair strategy — sealing accessible joints while replacing sections where the flex itself has degraded. For Greatwood’s 20–30-year-old systems, mastic plus targeted section replacement is usually the most cost-effective approach.
Proper sealing and insulation reduces humidity by preventing attic air infiltration and eliminating condensation inside duct walls. In Greatwood’s climate, sealed and insulated ducts can lower indoor relative humidity by 10–15% compared to leaky, uninsulated systems. The improvement is immediate and measurable.
Most flex duct repair, sealing, and insulation work in Greatwood does not require a permit if it stays within the existing system footprint. Modifications to trunk lines, plenum replacements, or changes to HVAC equipment connections may trigger Fort Bend County permitting requirements. We handle permit determination as part of our pre-work assessment — you’ll know before we start.
Written by Scott Gray, Owner at Lone Star Air Duct Cleaning Service Houston, serving Greatwood and Fort Bend County since 2004.