Insulating Metal Ductwork In Attic

How to insulate sheet metal ac ducts 1.

Insulating metal ductwork in attic.

Go to the basement or crawl space of your home. Check the speed of the blower motor on the furnace. Wear work gloves long sleeves and long. 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. Mechanically fasten and mastic seal all duct connections. The duct insulation should include a vapor barrier cover. 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.

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. Consider adding more insulation as ductwork is farther from the furnace. Because the simplest and cheapest way to insulate an attic is to add material to the floor. Use metal flex or fiber board ducts that are insulated to code.

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. 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. Choose a faced fiberglass.

If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. In this video this old house plumbing and heating expert richard trethewey helps a homeowner insulate his ductwork. Acute temperatures in these areas contribute to thermal loss in metal ductwork. 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. Energy saver dealers 204 202 views. The cost and effort to add more insulation is minimal. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.

Make sure the foil surface of the insulation is free of dust before applying the tape. If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw. If necessary switch the wires to reduce the blower to its lowest speed. Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal.

Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior.