Insulating Metal Ductwork In Attic

Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place.

Insulating metal ductwork in attic.

Check the speed of the blower motor on the furnace. If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw. Plan to pull up the flooring and layer new insulation on top of the old. The duct insulation should include a vapor barrier cover.

Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal. Mechanically fasten and mastic seal all duct connections. Consider adding more insulation as ductwork is farther from the furnace. How to insulate the attic air sealing the attic energy saving attic insulation duration.

Because the simplest and cheapest way to insulate an attic is to add material to the floor. Wrap metal duct tape around any seams you see in the ducts. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior. Energy saver dealers 204 202 views.

Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. Go to the basement or crawl space of your home. Duct board much like the duct liner is also a fiberglass product.

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. Use metal flex or fiber board ducts that are insulated to code. If your rigid metal ductwork has any insulation it may already have enough. The cost and effort to add more insulation is minimal.

Acute temperatures in these areas contribute to thermal loss in metal ductwork. Wear work gloves long sleeves and long. 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.

If necessary switch the wires to reduce the blower to its lowest speed. In this video this old house plumbing and heating expert richard trethewey helps a homeowner insulate his ductwork. 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. Choose a faced fiberglass.

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