Insulating Metal Ductwork In Attic

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.

Insulating metal ductwork in attic.

Plan to pull up the flooring and layer new insulation on top of the old. Protect yourself from itchy fibers when working with fiberglass insulation. Because the simplest and cheapest way to insulate an attic is to add material to the floor. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior.

Duct board much like the duct liner is also a fiberglass product. Choose a faced fiberglass. If your rigid metal ductwork has any insulation it may already have enough. Check the speed of the blower motor on the furnace.

The cost and effort to add more insulation is minimal. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. In this video this old house plumbing and heating expert richard trethewey helps a homeowner insulate his ductwork. Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.

Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. The duct insulation should include a vapor barrier cover. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. How to insulate sheet metal ac ducts 1.

If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. Wrap metal duct tape around any seams you see in the ducts. Make sure the foil surface of the insulation is free of dust before applying the tape. But if the floor is covered in plywood you can t stuff enough insulation beneath it to do the job sufficiently not even in warm climates.

Acute temperatures in these areas contribute to thermal loss in metal ductwork. If necessary switch the wires to reduce the blower to its lowest speed. Go to the basement or crawl space of your home. Consider adding more insulation as ductwork is farther from the furnace.

Mechanically fasten and mastic seal all duct connections. A metal duct conveying cool conditioned air through a broiling attic in summer or warm air through a chilly crawl. How to insulate the attic air sealing the attic energy saving attic insulation duration. Wear work gloves long sleeves and long.

Energy saver dealers 204 202 views. Use metal flex or fiber board ducts that are insulated to code.