Attic Flex Duct Repair and Mastic Sealing on Penman Rd in Jacksonville Beach
Street: Penman Rd, Jacksonville Beach
The Problem: Some bedrooms were consistently hotter than the rest of the house, and the home had high dust accumulation despite frequent filter changes.
Diagnostic Assessment: We crawled into the attic and found that two 8-inch flex ducts had detached from the main supply plenum, blowing cold air directly into the attic and sucking in humid attic dust and fiberglass insulation particles.
Resolution: We reconnected the collapsed flex ducts to the plenum using mechanical drawbands. We sealed all connections and joints on the sheet-metal plenum using fiber-reinforced mastic sealant and high-grade foil tape. We balanced the dampers to distribute airflow evenly.


