How To Insulate Hvac Ducts In Attic

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

How to insulate hvac ducts in attic.

If you need help deciding which type of insulation you need set up an energy consultation. 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. How to insulate the attic air sealing the attic energy saving attic insulation duration. How to insulate your central air heating ducts.

Inspect the span of ductwork to be insulated. Stop wasting money and energy with a leaking duct system. When hvac ducts are installed in a vented attic in a dry climate bury the ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space. 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. 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. 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. That s what happened to the ducts in the lead photo of this article. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior. Use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct.

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. Look for signs of air leaks at seams or joints such. Bury the ducts deeply in insulation. Make sure the foil surface of the insulation is free of dust before applying the tape.

Applying spray foam insulation to the outside of the duct. Invest in duct insulation today to safeguard your family s health and your pocketbook. The two most common ways to insulate ductwork are. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards that specify an r value of 8.

Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. Start saving money today. You re throwing money out the window.