Insulated Ductwork For Attic

Check the speed of the blower motor on the furnace.

Insulated ductwork for attic.

Hvac ductwork is typically visible in your attic especially flexible ductwork. 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. Is it ok to do it. 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.

The shiny vapor barrier will protect the ductwork from sweating as long as it s exposed to the surrounding air. The greater the temperature extreme between the air inside the duct and the air surrounding the ductwork the greater your need for duct insulation. Unfortunately so many houses especially newer homes end up with ductwork running through the attic. Use metal flex or fiber board ducts that are insulated to code.

Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. First consider the duct location. Covering ductwork with insulation. The duct insulation should include a vapor barrier cover.

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. In this video this old house plumbing and heating expert richard trethewey helps a homeowner insulate his ductwork. Today s flexible ductwork is covered with a shiny metallic cover this is its vapor barrier. 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.