Insulating Metal Ductwork In Attic

Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.

Insulating metal ductwork in attic.

How to insulate sheet metal ac ducts 1. Consider adding more insulation as ductwork is farther from the furnace. Protect yourself from itchy fibers when working with fiberglass insulation. Plan to pull up the flooring and layer new insulation on top of the old.

Energy saver dealers 204 202 views. Choose a faced fiberglass. Mechanically fasten and mastic seal all duct connections. If your rigid metal ductwork has any insulation it may already have enough.

If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw. Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal. Wear work gloves long sleeves and long. In this video this old house plumbing and heating expert richard trethewey helps a homeowner insulate his ductwork.

Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Duct board much like the duct liner is also a fiberglass product. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. How to insulate the attic air sealing the attic energy saving attic insulation duration.

Use metal flex or fiber board ducts that are insulated to code. If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. If necessary switch the wires to reduce the blower to its lowest speed. 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. Check the speed of the blower motor on the furnace. Acute temperatures in these areas contribute to thermal loss in metal ductwork.

Made from 1 to 2 inch thick sheets of rigid glass fiber and coated with an aluminum laminate for a moisture air barrier duct board comes in sections that fit together like metal ducts. The duct insulation should include a vapor barrier cover. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior. 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.

Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. A metal duct conveying cool conditioned air through a broiling attic in summer or warm air through a chilly crawl.