Ductwork In Attic How To Insulate

Use a paintbrush to apply duct mastic to the joints where an elbow.

Ductwork in attic how to insulate.

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. If your rigid metal ductwork has any insulation it may already have enough. Tape any punctures in the insulation s vapor barrier to prevent leaks.

Make sure the foil surface of the insulation is free of dust before applying the tape. 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. The duct insulation should include a vapor barrier cover. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct.

Use metal flex or fiber board ducts that are insulated to code. Look for signs of air leaks at seams or joints such as streams of dust. The attic ductwork is flex duct work. Avoid compressing the insulation.

How to insulate your central air heating ducts 1. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards. 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.

Most insulation relies upon the air space between its fibers to deliver the r value promised. How to insulate the attic air sealing the attic energy saving attic insulation duration. Energy saver dealers 204 202 views. I called out the original hvac company and they took a look and said they saw no water.

Check the speed of the blower motor on the furnace. The cost and effort to add more insulation is minimal. Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Use a pressure sensitive vapor retarder tape designed for ductwork.

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. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. 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. It was new when the ac was put in 7 years ago.