Air Duct Replacement in Lakeland, FL

When does replacing duct beat patching it?

Ask that before anyone quotes you. Torn outer jacket on one flex run is a patch. Inner liner delamination is not. When the mylar core separates and balloons, airflow collapses and no tape fixes it. Same with fiberglass ductboard trunks that absorbed water. Once ductboard is wet and holds mold, cleaning it just erodes the surface. That trunk gets replaced.

Lakeland attics make this call often. Supply surfaces run cold. Attic air runs humid, and sweating duct stains ceilings. We look at insulation value on the existing runs and boot connections at the drywall. We also check whether boots have dropped into the blown insulation. A disconnected boot pulls loose fiberglass straight into the airstream.

Replacement work is mostly geometry. Shorter runs, fewer sharp bends. Proper strap spacing keeps flex from sagging between supports. Sagging flex kills static pressure. Plenum takeoffs get sealed with mastic, not tape. Return leaks get addressed at the same time, since the return is what pulls attic air in.

Not every system needs it. 1980s-era flex that is intact, supported, and sealed can stay. What moves this job is run count and attic clearance. Also whether the plenum itself is ductboard that failed.