How To Insulate Hvac Ducts In Attic

Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct.

How to insulate hvac ducts in attic. 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. That s what happened to the ducts in the lead photo of this article. Make sure the foil surface of the insulation is free of dust before applying the tape. 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.

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. 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. If necessary switch the wires to reduce the blower to its lowest speed.

Energy saver dealers 204 202 views. Check the speed of the blower motor on the furnace. Stop wasting money and energy with a leaking duct system. Use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct.

Start saving money today. 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. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards that specify an r value of 8. Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.

Wrapping the duct in a foil faced blanket. The two most common ways to insulate ductwork are. You re throwing money out the window. How to insulate the attic air sealing the attic energy saving attic insulation duration.

Bury the ducts deeply in insulation. Look for signs of air leaks at seams or joints such. If you need help deciding which type of insulation you need set up an energy consultation. Applying spray foam insulation to the outside of the duct.

Inspect the span of ductwork to be insulated. How to insulate your central air heating ducts. Duct board much like the duct liner is also a fiberglass product.