Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.
Insulated attic duct.
The duct insulation should include a vapor barrier cover.
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.
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.
Reflectix r 21 100 sq ft unfaced reflective roll insulation 48 in w x 25 ft l item 13358.
For pricing and availability.
Acute temperatures in these areas contribute to thermal loss in metal ductwork.
Use metal flex or fiber board ducts that are insulated to code.
Duct insulation accessories.
For pricing and availability.
Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal.
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.