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. Look for signs of air leaks at seams or joints such as streams of dust. 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. Cover the metal ductwork with closed cell spray foam.

Sure up leaky duct joints. It was new when the ac was put in 7 years ago. Make sure the foil surface of the insulation is free of dust before applying the tape. How to insulate your central air heating ducts 1.

Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. Mechanically fasten and mastic seal all duct connections. How to insulate your attic duct system step by step with video instructions assess current state of attic insulation. Use a paintbrush to apply duct mastic to the joints where an elbow.

Most insulation relies upon the air space between its fibers to deliver the r value promised. Avoid compressing the insulation. 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.

I called out the original hvac company and they took a look and said they saw no water. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Insulation itself keeps warm air in and prevents cold air from infiltrating. 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.

Inspect the span of ductwork to be insulated. Tape any punctures in the insulation s vapor barrier to prevent leaks. Check the speed of the blower motor on the furnace. Energy saver dealers 204 202 views.

The duct work is the backbone of air exchange and ventilation. If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. If necessary switch the wires to reduce the blower to its lowest. Cover the spray foam with fire retardant spray.

Use a pressure sensitive vapor retarder tape designed for ductwork. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. The attic ductwork is flex duct work.