Insulated Attic Duct

Most attic ducts are insulated flex ducts that is flex ducts with r 6 or r 8 fiberglass insulation along with an exterior polyethylene jacket.

Insulated attic duct. When these ducts are exposed to exterior air the plastic jacket never gets cold enough to permit condensation because the hot attic air keeps the plastic jacket warm. When hvac ducts are installed in a vented attic in a dry climate bury the ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space. The duct insulation should include a vapor barrier cover. Reflectix r 21 100 sq ft unfaced reflective roll insulation 48 in w x 25 ft l item 13358.

Summer hasn t even arrived he notes in a post at gba s q a forum and when the temperature outside climbs to more than 95 f the temperature in the attic tops 120 f. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. Acute temperatures in these areas contribute to thermal loss in metal ductwork. Use metal flex or fiber board ducts that are insulated to code.

Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal. For pricing and availability. Attics that are poorly insulated will not efficiently recycle the air being blown by the ac heat which rises to the attic but with the right r value inches of insulation air will be properly reverted back into the house saving your ac heating unit from overworking and keeping your bills from skyrocketing.