How To Insulate Heating Ducts In Attic

They may have an adhesive strip to make the installation a little easier.

How to insulate heating ducts in attic.

How to insulate your central air heating ducts 1. If necessary switch the wires to reduce the blower to its lowest speed. 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. Don t use standard cloth duct tape on hvac ductwork since the adhesive won t hold up to extreme temperatures.

Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards. That s what happened to the ducts in the lead photo of this article. I found instead a vintage 3 ton ac unit with 1 rigid insulation taped all over it and insulated flex duct snaking all over the poorly insulated attic. To install sleeves you must either disassemble the ductwork and slide it on before reassembling the ducts or as many homeowners find themselves doing slit it and wrap it around like the blanket style material.

Check the speed of the blower motor on the furnace. Look for signs of air leaks at seams or joints such as streams of dust. Measure each run of exposed duct in an attic basement or under a subfloor. Energy saver dealers 204 202 views.

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. 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. For an added layer of protection you can apply duct mastic to the tape and duct. How to insulate the attic air sealing the attic energy saving attic insulation duration.

When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Come in pre measured lengths. In the end it s probably best to buy the blanket insulation. Inspect the span of ductwork to be insulated.

The rigid insulation was saturated from condensation. Use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Obtain foil face fiberglass insulation based on the sizes.

Install loose fill insulation to cover the ducts and the attic floor to meet or exceed the code required r value for attic insulation. Measure the size of all square rectangular or circular ducts. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place.