Duct Sealing in Orlando, FL

Duct sealing in Orlando attics

You feel attic heat at the register. A back bedroom never cools. There is a musty smell when the system kicks on, and a gray fuzz ring around the ceiling vent. Those are leak symptoms, not thermostat symptoms. In most Orlando houses the leak is at a boot, a collar, or a framed return chase. Not in the middle of the flex run.

Mastic is the fix, not tape. Cloth duct tape fails in attic heat. Foil tape loses grip on dusty sheet metal. We brush fiber-reinforced mastic over the collar seam, then band the flex inner core to the takeoff with a tension strap. The outer jacket gets strapped separately. Two straps, two jobs. Skip that and the vapor barrier leaks humid air onto cold metal, which is why boots sweat and ceilings stain.

Return side matters more here. Builders in the seventies through the nineties framed returns inside stud and truss cavities, bare wood, no sheet metal. That cavity pulls attic air past your filter. Sealing it changes dust load fast.

Sealing is pointless on torn flex with exposed fiberglass or crushed runs. We say replace that section instead. Leaks get documented with photos before mastic covers them.