Best Way To Insulate Heating Ducts In Attic

Check the speed of the blower motor on the furnace. The 1 800 square foot brick ranch in climate zone 4 dates from the 1960s but the previous owner installed both a furnace and ductwork in the attic just four years ago. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior.

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Use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct.

Best way to insulate heating ducts in attic.

Because the simplest and cheapest way to insulate an attic is to add material to the floor. If necessary switch the wires to reduce the blower to its lowest speed. Plan to pull up the flooring and layer new insulation on top of the old. Duct board much like the duct liner is also a fiberglass product.

But if the floor is covered in plywood you can t stuff enough insulation beneath it to do the job sufficiently not even in warm climates. The unconditioned space also houses his hvac system. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. If you re facing that as one choice for a new home or if you already have that in your existing home here are some ways to reduce your duct losses.

Heaping insulation over the ducts is fine in dry climates but can cause condensation on the duct insulation jacket in humid climates. 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. Unconditioned attics are the worst place to put ducts. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct.

The doe s building america program recommends beds buried encapsulated ducts. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. Get the ducts out of the attic and into the conditioned space below. By spraying closed cell foam on the ducts before burying them in attic insulation you prevent the condensation problem.

Ted has more than a few cobwebs in his attic. 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 insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Make sure the foil surface of the insulation is free of dust before applying the tape.

Doing this results in zero additional load.

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