Insulating Metal Ductwork In Attic

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.

Insulating metal ductwork in attic.

A metal duct conveying cool conditioned air through a broiling attic in summer or warm air through a chilly crawl. If your rigid metal ductwork has any insulation it may already have enough. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order.

Use metal flex or fiber board ducts that are insulated to code. Although both the attic floor and the ductwork are insulated ted recognizes the situation isn t ideal. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Consider adding more insulation as ductwork is farther from the furnace.

Wrap metal duct tape around any seams you see in the ducts. Choose a faced fiberglass. Make sure the foil surface of the insulation is free of dust before applying the tape. Check the speed of the blower motor on the furnace.

Wear work gloves long sleeves and long. Plan to pull up the flooring and layer new insulation on top of the old. 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.

If necessary switch the wires to reduce the blower to its lowest speed. Energy saver dealers 204 202 views. In this video this old house plumbing and heating expert richard trethewey helps a homeowner insulate his ductwork. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.

Acute temperatures in these areas contribute to thermal loss in metal ductwork. How to insulate sheet metal ac ducts 1. 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. Mechanically fasten and mastic seal all duct connections.

How to insulate the attic air sealing the attic energy saving attic insulation duration. Go to the basement or crawl space of your home. 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.

The cost and effort to add more insulation is minimal. Because the simplest and cheapest way to insulate an attic is to add material to the floor.