How To Insulate Ac Ducts In Attic

The foam provides a vapor barrier so the ductwork won t sweat.

How to insulate ac ducts in attic.

When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. You don t have to wash them but wiping them with a damp cloth or whisking them with a broom and making sure the surface is dry will help the sealant to duct bond. Cover the metal ductwork with closed cell spray foam. If necessary switch the wires to reduce the blower to its lowest speed.

Then air seal and insulate the attic much better incidentally she also used 1200 gallons of propane last winter. Look for signs of air leaks at seams or joints such as streams of dust. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Make sure the foil surface of the insulation is free of dust before applying the tape.

Bury the ducts deeply in insulation. This isn t equivalent to bringing them into the conditioned space as you ll still have additional duct load but it s a lot better than having them in unconditioned attic space. Energy saver dealers 204 202 views. Her response was the water will evaporate from the ducts by the time i need the ac on.

Add additional sealant if necessary. Several manufacturers including certainteed and owens corning make fiberglass duct insulation with an integral jacket. She is also still convinced that snow is blowing in through the soffits despite my evidence that is is not and in fact can t because there are. That s what happened to the ducts in the lead photo of this article.

Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards. Inspect the span of ductwork to be insulated. Of course the seams on the duct insulation must be sealed with a high quality tape. Select your desired sealant or use a combination of products as appropriate.

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. Use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct. After the inspection seal your ducts keeping a few tips in mind.

If using this technique in a humid or marine climate the ducts must be encapsulated with spray foam before installing the blown insulation. Owens corning duct insulation. Install loose fill insulation to cover the ducts and the attic floor to meet or exceed the code required r value for attic insulation. Start with clean dry ducts.

How to insulate your central air heating ducts 1.