Ductwork In Attic How To Insulate

If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw.

Ductwork in attic how to insulate.

The attic ductwork is flex duct work. The duct insulation should include a vapor barrier cover. If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. Tape any punctures in the insulation s vapor barrier to prevent leaks.

Mechanically fasten and mastic seal all duct connections. Look for signs of air leaks at seams or joints such as streams of dust. It was new when the ac was put in 7 years ago. Use a paintbrush to apply duct mastic to the joints where an elbow.

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

Make sure the foil surface of the insulation is free of dust before applying the tape. Use a pressure sensitive vapor retarder tape designed for ductwork. Energy saver dealers 204 202 views. Consider adding more insulation as ductwork is farther from the furnace.

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. Inspect the span of ductwork to be insulated. 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. How to insulate the attic air sealing the attic energy saving attic insulation duration. If your rigid metal ductwork has any insulation it may already have enough. 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. 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. Avoid compressing the insulation. Check the speed of the blower motor on the furnace.