How To Insulate Duct Work In Attic

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.

How to insulate duct work in attic.

It was new when the ac was put in 7 years ago. If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. Avoid compressing the insulation. Cover the metal ductwork with closed cell spray foam.

Check the speed of the blower motor on the furnace. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. 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. Sure up leaky duct joints.

Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. If necessary switch the wires to reduce the blower to its lowest. Use a pressure sensitive vapor retarder tape designed for ductwork. Cover the spray foam with fire retardant spray.

Most insulation relies upon the air space between its fibers to deliver the r value promised. Insulation itself keeps warm air in and prevents cold air from infiltrating. The attic ductwork is flex duct work. I called out the original hvac company and they took a look and said they saw no water.

Use a paintbrush to apply duct mastic to the joints where an elbow. The duct work is the backbone of air exchange and ventilation. How to insulate your central air heating ducts 1. Mechanically fasten and mastic seal all duct connections.

Make sure the foil surface of the insulation is free of dust before applying the tape. Energy saver dealers 204 202 views. Use metal flex or fiber board ducts that are insulated to code. The foam provides a vapor barrier so the ductwork won t sweat.

Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards. How to insulate your attic duct system step by step with video instructions assess current state of attic insulation. The duct insulation should include a vapor barrier cover. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place.

Inspect the span of ductwork to be insulated. Look for signs of air leaks at seams or joints such as streams of dust. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.