Ductwork In Attic How To Insulate

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.

Ductwork in attic how to insulate.

If necessary switch the wires to reduce the blower to its lowest. The cost and effort to add more insulation is minimal. 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. Insulating hvac ductwork when insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value.

Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. If your rigid metal ductwork has any insulation it may already have enough. Avoid compressing the insulation. Tape any punctures in the insulation s vapor barrier to prevent leaks.

Check the speed of the blower motor on the furnace. Use metal flex or fiber board ducts that are insulated to code. Most insulation relies upon the air space between its fibers to deliver the r value promised. Use a paintbrush to apply duct mastic to the joints where an elbow.

Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards. Mechanically fasten and mastic seal all duct connections. How to insulate the attic air sealing the attic energy saving attic insulation duration. 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. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. The duct insulation should include a vapor barrier cover.

Inspect the span of ductwork to be insulated. Energy saver dealers 204 202 views. If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct.

If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. 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. Make sure the foil surface of the insulation is free of dust before applying the tape. It was new when the ac was put in 7 years ago.