How To Insulate Hvac Ducts In Attic

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How to insulate hvac ducts in attic. Most attic ducts are insulated flex ducts that is flex ducts with r 6 or r 8 fiberglass insulation along with an exterior polyethylene jacket. Sometimes metal ducts are lined with duct liner a 1 inch thick fiberglass board that insulates the interior of the duct rather than the exterior. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior.

Make sure the foil surface of the insulation is free of dust before applying the tape. How to insulate your central air heating ducts. That s what happened to the ducts in the lead photo of this article. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.

Bury the ducts deeply in insulation. Invest in duct insulation today to safeguard your family s health and your pocketbook. Applying spray foam insulation to the outside of the duct. Wrapping the duct in a foil faced blanket.

Check the speed of the blower motor on the furnace. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Inspect the span of ductwork to be insulated.

If you need help deciding which type of insulation you need set up an energy consultation. The two most common ways to insulate ductwork are. Energy saver dealers 204 202 views. How to insulate the attic air sealing the attic energy saving attic insulation duration.

When these ducts are exposed to exterior air the plastic jacket never gets cold enough to permit condensation because the hot attic air keeps the plastic jacket warm. Duct board much like the duct liner is also a fiberglass product. If necessary switch the wires to reduce the blower to its lowest speed. 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.

Use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct. Look for signs of air leaks at seams or joints such. You re throwing money out the window.