How To Insulate Duct Work In Attic

The duct work is the backbone of air exchange and ventilation.

How to insulate duct work in attic. How to insulate your central air heating ducts 1. Sure up leaky duct joints. It was new when the ac was put in 7 years ago. Energy saver dealers 204 202 views.

Make sure the foil surface of the insulation is free of dust before applying the tape. If necessary switch the wires to reduce the blower to its lowest. Cover the metal ductwork with closed cell spray foam. 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 paintbrush to apply duct mastic to the joints where an elbow. 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. The foam provides a vapor barrier so the ductwork won t sweat.

Look for signs of air leaks at seams or joints such as streams of dust. How to insulate the attic air sealing the attic energy saving attic insulation duration. Use a pressure sensitive vapor retarder tape designed for ductwork. Cover the spray foam with fire retardant spray.

Mechanically fasten and mastic seal all duct connections. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. Use metal flex or fiber board ducts that are insulated to code. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards.

Insulation itself keeps warm air in and prevents cold air from infiltrating. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Inspect the span of ductwork to be insulated. Most insulation relies upon the air space between its fibers to deliver the r value promised.

I called out the original hvac company and they took a look and said they saw no water. 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. How to insulate your attic duct system step by step with video instructions assess current state of attic insulation. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.

The duct insulation should include a vapor barrier cover. The attic ductwork is flex duct work. Tape any punctures in the insulation s vapor barrier to prevent leaks.