Air Duct Repair in Houston, TX

What air duct repair actually involves in a Houston attic

One room stays warm. A register barely moves air. Maybe you hear the blower working and feel almost nothing at the vent. In Houston attics that usually traces to flex duct, not the equipment. Insulated flex has been the dominant duct type here since the 1980s. It sags between joists, kinks at tight radii, and pulls loose at the boot collar. A long sagging run behaves like a partly closed damper.

The outer jacket matters as much as the core. Once it tears, humid attic air reaches the inner liner. That is where condensation and surface mold show up, usually at plenum seams and boot connections. Repair means re-supporting the run with proper strapping. Crews re-mastic the collar. Then they seal the boot to the ceiling drywall. Tape alone fails in attic heat.

Older housing stock brings different problems. Pre-1970 galvanized trunk-and-branch often has original fiberglass liner that is now shedding. 1960s-80s ductboard plenums erode on the interior face. Those get hand-brushing and negative-pressure source removal, not blind spraying.

Some things are not worth repairing. If the inner core is torn along most of a run, or blown-in cellulose has been pulled through an unsealed chase into the return, replacing that run is the answer.