Duct Sealing in Alpine - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Alpine

We seal ducts in Alpine homes where the Santa Ana winds blow fine ash through attic gaps and the original 1960s galvanized trunk lines have rusted open at the collars. Our Duct Sealing crew dispatches from our San Diego office and carries mastic, mesh tape, and replacement flex for the ranch-style homes that dominate this market. Most Alpine jobs are scheduled within a few days, and we price them in writing before we touch anything. Call (361) 326-5060 for a free estimate.

Call (361) 326-5060

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

Alpine homeowners call us after other crews have cleaned the ducts but the campfire smell returns with the next dry wind. We’ve been part of the Garrison Partners family since 2004, and our 365-Day Done Right Promise means if a sealed joint fails or that odor comes back, we return at no charge. Our technicians are background-checked, uniformed, and expected to arrive inside the quoted window, leave the site clean, and explain what they found before they pack up. That’s The Garrison Standard, and it’s written, not implied.

We know the difference between a duct that needs sealing and one that needs replacement because we’ve pulled registers in homes off Alpine Boulevard, South Grade Road, and the rural lots near the Cleveland National Forest boundary. We don’t guess. We run a camera, show you the breach, and write down the price to fix it.

Duct Sealing Services in Alpine

Duct Sealing Services in Alpine address the pinholes, open collars, and separated joints that let attic dust, ash, and pollen circulate through your living space. A typical sealing job in Alpine runs $450 – $950 for a single-system ranch home, depending on how many joints need mastic and whether sections of flex duct have degraded past saving. We find the leaks with a pressure test and camera inspection, then seal accessible joints with duct mastic and reinforced mesh tape. The goal is simple: the air you paid to heat or cool should reach the rooms, not leak into the attic.

Pressure Testing and Leak Location

We pressurize the duct system and measure the loss. In Alpine’s older ranches, we regularly see 25 – 35 percent leakage at the trunk lines alone. The test takes about 30 minutes and shows exactly where your money is disappearing.

Mastic Sealing of Galvanized Trunks

Original galvanized pipe can’t be sealed with tape alone. We brush on water-based duct mastic, embed fiberglass mesh tape at seams and collars, and coat again. The result survives the attic heat cycles that cracked the original joints.

Duct Insulation in Alpine

Duct Insulation in Alpine protects against the attic temperatures that bake exposed metal trunk lines and turn flex duct into a heat sink. In summer, an uninsulated galvanized trunk in an Alpine attic can reach 140 degrees, forcing your AC to overcook the air just to offset the gain. Wrapping those runs with R-6 or R-8 fiberglass insulation, sealed with a vapor barrier, typically costs $600 – $1,400 in Alpine depending on linear footage and attic accessibility. We insulate after we seal, so you’re not trapping leakage inside a warm blanket.

Attic Heat Gain Reduction

Insulated ducts deliver air closer to the temperature your thermostat requested. In Alpine’s semi-arid climate, that means your system cycles less, runs quieter, and doesn’t fight the attic on every call for cooling.

Vapor Barrier Installation

We use faced insulation with a sealed vapor barrier to prevent condensation on cold ducts during the occasional humid morning. Without it, wrapped ducts sweat, the insulation mats, and you get mold-adjacent conditions in the attic.

Trusted Brands We Service in Alpine

We stock parts and materials from Rotobrush, Nikro, and Guardsman for Alpine jobs, and we carry Honeywell and Aprilaire filtration products when a sealed system needs better air cleaning at the return. Most sealing materials are on the van, so we’re not waiting on a parts run to finish your job. If we find a section of flex duct that needs replacement rather than tape, we pull the right diameter and R-value from stock and keep working.

Common Duct Sealing Problems We See in Alpine Homes

• Original galvanized trunk lines rusted through at seams. The 1950s – 70s ranch homes throughout Alpine were built with R-4 galvanized pipe that corrodes at the collars. We find open returns pulling raw attic dust straight into the supply side, and the only proper fix is mastic sealing or section replacement.
• Early flex duct crushed under insulation or torn by rodents. Alpine’s rural lots see more rodent traffic than suburban San Diego County, and the thin flex duct from the 1970s tears at entry points. Tape won’t hold; the damaged run needs replacement before sealing the rest of the system.
• Open joints discovered during post-wind cleaning. After a Santa Ana event, we pull registers and find collars separated by vibration and heat cycling. Cleaning without sealing just clears the path for the next ash load.
• Sealing performed without source removal traps smoke residue. A crew cleans the ducts, another crew seals the leaks, but nobody removed the embedded ash. The leaks stop, the odor stays, and the next dry wind reactivates it.

Pricing for Duct Sealing in Alpine, CA

We Also Serve Cities Near Alpine

Our crews work throughout East County, including Alpine and the surrounding communities of Jamul, Lakeside, El Cajon, and Santee. Each job carries the same written price guarantee and 365-Day Done Right Promise.

FAQs About Duct Sealing in Alpine