Insulating Ductwork In Attic Venting

Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal.

Insulating ductwork in attic venting.

Other times insulation may be on the outside. Ted also has inherited a powered attic ventilator. The 1 800 square foot brick ranch in climate zone 4 dates from the 1960s but the previous owner installed both a furnace and ductwork in the attic just four years ago. Flexible ductwork comes with different insulation r values.

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. Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Make sure the foil surface of the insulation is free of dust before applying the tape. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.

Unfortunately so many houses especially newer homes end up with ductwork running through the attic. The greater the temperature extreme between the air inside the duct and the air surrounding the ductwork the greater your need for duct insulation. Sometimes the insulation is inside the ductwork.