How To Insulate Duct Work 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.

How to insulate duct work in attic.

If necessary switch the wires to reduce the blower to its lowest. Use a pressure sensitive vapor retarder tape designed for ductwork. Tape any punctures in the insulation s vapor barrier to prevent leaks. The duct insulation should include a vapor barrier cover.

Recently i had another hvac company come out and put in a new bathroom vent and they told me they believed the duct work was full of water. Mechanically fasten and mastic seal all duct connections. Energy saver dealers 204 202 views. Avoid compressing the insulation.

Inspect the span of ductwork to be insulated. How to insulate the attic air sealing the attic energy saving attic insulation duration. Cover the spray foam with fire retardant spray. Sure up leaky duct joints.

It was new when the ac was put in 7 years ago. Most insulation relies upon the air space between its fibers to deliver the r value promised. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Check the speed of the blower motor on the furnace.

How to insulate your central air heating ducts 1. Make sure the foil surface of the insulation is free of dust before applying the tape. Insulation itself keeps warm air in and prevents cold air from infiltrating. The attic ductwork is flex duct work.

Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Look for signs of air leaks at seams or joints such as streams of dust. The foam provides a vapor barrier so the ductwork won t sweat. Use a paintbrush to apply duct mastic to the joints where an elbow.

Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards. 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. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.

The duct work is the backbone of air exchange and ventilation. Use metal flex or fiber board ducts that are insulated to code. I called out the original hvac company and they took a look and said they saw no water.