How To Insulate Duct Work In Attic

Use metal flex or fiber board ducts that are insulated to code.

How to insulate duct work in attic.

Avoid compressing the insulation. Check the speed of the blower motor on the furnace. Cover the metal ductwork with closed cell spray foam. The duct work is the backbone of air exchange and ventilation.

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 a pressure sensitive vapor retarder tape designed for ductwork. Energy saver dealers 204 202 views.

How to insulate your attic duct system step by step with video instructions assess current state of attic insulation. Insulation itself keeps warm air in and prevents cold air from infiltrating. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. 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.

Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Mechanically fasten and mastic seal all duct connections. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards. Cover the spray foam with fire retardant spray.

I called out the original hvac company and they took a look and said they saw no water. The attic ductwork is flex duct work. The foam provides a vapor barrier so the ductwork won t sweat. How to insulate the attic air sealing the attic energy saving attic insulation duration.

Most insulation relies upon the air space between its fibers to deliver the r value promised. Look for signs of air leaks at seams or joints such as streams of dust. Sure up leaky duct joints. Use a paintbrush to apply duct mastic to the joints where an elbow.

The duct insulation should include a vapor barrier cover. 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. 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.

Inspect the span of ductwork to be insulated. If necessary switch the wires to reduce the blower to its lowest. How to insulate your central air heating ducts 1.