Best Way To Insulate Attic Ductwork

Duct board much like the duct liner is also a fiberglass product.

Best way to insulate attic ductwork.

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. It was new when the ac was put in 7 years ago. Humid hot attic air will work its way into the batts until it finds the cold duct board surface that once used to stay warm before you wrapped it and if that surface is cold enough moisture will collect and ruin your nice insulation job. Loose fill or batt the common term for blanket insulation.

Both can be added to uninsulated attics or layered over existing material. Repeat to insulate the remaining ducts. Choosing the type of duct insulation. Apply a long strip of foil tape along the seam in the insulation.

The insulation type will be determined by your ductwork configuration and budget. There is more than one way to insulate ductwork. Recently i had another hvac company come out and put in a new bathroom vent and they told me they believed the duct work was full of water. Our heating and ac ducts are 100 within the thermal envelope in the floor trusses above our insulated basement.

The attic ductwork is flex duct work. I called out the original hvac company and they took a look and said they saw no water. But if you go this route you re forgetting something super important. The only way you can hope to prevent this from happening is to have an absolutely air tight vapor.

For diy attic insulation you ve got two choices. Wrap the insulation around the duct and then pinch the seam closed. The two most common ways to insulate ductwork are. Once you ve decided which type is best for you examine the material options and prices to home in on the right product.

To install preformed duct insulation start by disconnecting an elbow to expose the end of the duct. Wrapping the duct in a foil faced blanket. Before insulating seal any air leaks and make roof and other necessary repairs. Ok some people and contractors do insulate their ducts this way.

If it is located in a conditioned part of the house also remember to insulate and air seal your attic access. Once you seal your ducts you can insulate the ducts. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. And technically the ducts are insulated afterward.

Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. But our erv ducts stand alone system not tied in w heat pump and 2 jumper ducts for pressure balancing from bedrooms are suspended above the insulation in our vented attic. Adding insulation to your ducts isn t as simple as getting some duct wrap and taping it together.