Insulating Metal Ductwork In Attic

Because the simplest and cheapest way to insulate an attic is to add material to the floor.

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. Duct board much like the duct liner is also a fiberglass product. Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Consider adding more insulation as ductwork is farther from the furnace.

Wear work gloves long sleeves and long. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. How to insulate the attic air sealing the attic energy saving attic insulation duration. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.

Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal. Use metal flex or fiber board ducts that are insulated to code. 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. Mechanically fasten and mastic seal all duct connections.

Choose a faced fiberglass. Check the speed of the blower motor on the furnace. 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.

Wrap metal duct tape around any seams you see in the ducts. 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. Plan to pull up the flooring and layer new insulation on top of the old. If necessary switch the wires to reduce the blower to its lowest speed.

Go to the basement or crawl space of your home. Energy saver dealers 204 202 views. Acute temperatures in these areas contribute to thermal loss in metal ductwork. If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw.

Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior. How to insulate sheet metal ac ducts 1. Protect yourself from itchy fibers when working with fiberglass insulation. Make sure the foil surface of the insulation is free of dust before applying the tape.

The cost and effort to add more insulation is minimal. A metal duct conveying cool conditioned air through a broiling attic in summer or warm air through a chilly crawl.