How To Insulate Ac Ducts In Attic

Bury the ducts deeply in insulation.

How to insulate ac ducts in attic.

Use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct. 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. After the inspection seal your ducts keeping a few tips in mind. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards.

If using this technique in a humid or marine climate the ducts must be encapsulated with spray foam before installing the blown insulation. If necessary switch the wires to reduce the blower to its lowest speed. Several manufacturers including certainteed and owens corning make fiberglass duct insulation with an integral jacket. How to insulate your central air heating ducts 1.

That s what happened to the ducts in the lead photo of this article. 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. 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 spray foam with fire retardant spray.

Energy saver dealers 204 202 views. How to insulate the attic air sealing the attic energy saving attic insulation duration. Owens corning duct insulation. Then air seal and insulate the attic much better incidentally she also used 1200 gallons of propane last winter.

Add additional sealant if necessary. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Cover the metal ductwork with closed cell spray foam. Her response was the water will evaporate from the ducts by the time i need the ac on.

Make sure the foil surface of the insulation is free of dust before applying the tape. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Start with clean dry ducts.

Check the speed of the blower motor on the furnace. If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. Inspect the span of ductwork to be insulated. Of course the seams on the duct insulation must be sealed with a high quality tape.

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