How To Insulate Duct Work In Attic

Make sure the foil surface of the insulation is free of dust before applying the tape.

How to insulate duct work in attic.

Sure up leaky duct joints. How to insulate your central air heating ducts 1. How to insulate your attic duct system step by step with video instructions assess current state of attic insulation. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place.

Avoid compressing the insulation. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards. The attic ductwork is flex duct work. Use a paintbrush to apply duct mastic to the joints where an elbow.

Cover the spray foam with fire retardant spray. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. The duct work is the backbone of air exchange and ventilation.

The duct insulation should include a vapor barrier cover. 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. I called out the original hvac company and they took a look and said they saw no water. Cover the metal ductwork with closed cell spray foam.

Insulation itself keeps warm air in and prevents cold air from infiltrating. Use metal flex or fiber board ducts that are insulated to code. 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.

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. If necessary switch the wires to reduce the blower to its lowest. Check the speed of the blower motor on the furnace. Energy saver dealers 204 202 views.

Tape any punctures in the insulation s vapor barrier to prevent leaks. It was new when the ac was put in 7 years ago. Inspect the span of ductwork to be insulated. Most insulation relies upon the air space between its fibers to deliver the r value promised.

If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. The foam provides a vapor barrier so the ductwork won t sweat. Use a pressure sensitive vapor retarder tape designed for ductwork.