Ductwork In Attic How To Insulate

Use metal flex or fiber board ducts that are insulated to code.

Ductwork in attic how to insulate.

Most insulation relies upon the air space between its fibers to deliver the r value promised. Consider adding more insulation as ductwork is farther from the furnace. The attic ductwork is flex duct work. 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.

Inspect the span of ductwork to be insulated. I called out the original hvac company and they took a look and said they saw no water. How to insulate your central air heating ducts 1. Use a pressure sensitive vapor retarder tape designed for ductwork.

If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. How to insulate the attic air sealing the attic energy saving attic insulation duration. 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. If necessary switch the wires to reduce the blower to its lowest. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards. Avoid compressing the insulation.

Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. The duct insulation should include a vapor barrier cover. Look for signs of air leaks at seams or joints such as streams of dust. If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw.

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 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 your rigid metal ductwork has any insulation it may already have enough. Mechanically fasten and mastic seal all duct connections.

Tape any punctures in the insulation s vapor barrier to prevent leaks. 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. Energy saver dealers 204 202 views.