Insulated Ductwork For Attic

Unfortunately so many houses especially newer homes end up with ductwork running through the attic.

Insulated ductwork for attic.

Is it ok to do it. 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. If necessary switch the wires to reduce the blower to its lowest speed. Covering ductwork with insulation.

First consider the duct location. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Today s flexible ductwork is covered with a shiny metallic cover this is its vapor barrier. Use metal flex or fiber board ducts that are insulated to code.

In this video this old house plumbing and heating expert richard trethewey helps a homeowner insulate his ductwork. The duct insulation should include a vapor barrier cover. Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.

The shiny vapor barrier will protect the ductwork from sweating as long as it s exposed to the surrounding air. Check the speed of the blower motor on the furnace. 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. 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.