How To Insulate Duct Work In Attic

Check the speed of the blower motor on the furnace.

How to insulate duct work in attic.

How to insulate your attic duct system step by step with video instructions assess current state of attic insulation. Make sure the foil surface of the insulation is free of dust before applying the tape. Energy saver dealers 204 202 views. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards.

I called out the original hvac company and they took a look and said they saw no water. Look for signs of air leaks at seams or joints such as streams of dust. How to insulate your central air heating ducts 1. The foam provides a vapor barrier so the ductwork won t sweat.

Insulation itself keeps warm air in and prevents cold air from infiltrating. The attic ductwork is flex duct work. It was new when the ac was put in 7 years ago. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.

If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. Inspect the span of ductwork to be insulated. Use a paintbrush to apply duct mastic to the joints where an elbow. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct.

Use a pressure sensitive vapor retarder tape designed for ductwork. Avoid compressing the insulation. Sure up leaky duct joints. Tape any punctures in the insulation s vapor barrier to prevent leaks.

Cover the spray foam with fire retardant spray. 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 the attic air sealing the attic energy saving attic insulation duration. 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 the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Cover the metal ductwork with closed cell spray foam. Mechanically fasten and mastic seal all duct connections. 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.

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. If necessary switch the wires to reduce the blower to its lowest.