Insulating Metal Ductwork In Attic

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Insulating metal ductwork in attic. If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. The duct insulation should include a vapor barrier cover. If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw. How to insulate sheet metal ac ducts 1.

Consider adding more insulation as ductwork is farther from the furnace. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. In this video this old house plumbing and heating expert richard trethewey helps a homeowner insulate his ductwork. How to insulate the attic air sealing the attic energy saving attic insulation duration.

If necessary switch the wires to reduce the blower to its lowest speed. If your rigid metal ductwork has any insulation it may already have enough. Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal. Duct board much like the duct liner is also a fiberglass product.

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

Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Wrap metal duct tape around any seams you see in the ducts. Choose a faced fiberglass. Use metal flex or fiber board ducts that are insulated to code.

A metal duct conveying cool conditioned air through a broiling attic in summer or warm air through a chilly crawl. The cost and effort to add more insulation is minimal. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior. Check the speed of the blower motor on the furnace.

Make sure the foil surface of the insulation is free of dust before applying the tape. Mechanically fasten and mastic seal all duct connections. Because the simplest and cheapest way to insulate an attic is to add material to the floor. Go to the basement or crawl space of your home.

Wear work gloves long sleeves and long. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place.