Insulating Hvac Ducts In Attic

Apply a long strip of foil tape along the seam in the insulation.

Insulating hvac ducts in attic.

Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards that specify an r value of 8 for attic ducts and 6 for ducts located anywhere else. Wrap the insulation around the duct and then pinch the seam closed. So water is condensing on your ac ducts. Secure the insulation with short strips of foil tape.

The rigid insulation was saturated from condensation. Insulated ducts have been the standard for decades now. Repeat to insulate the remaining ducts. I found instead a vintage 3 ton ac unit with 1 rigid insulation taped all over it and insulated flex duct snaking all over the poorly insulated attic.

This of course is a good thing. Our heating and ac ducts are 100 within the thermal envelope in the floor trusses above our insulated basement. Close to 25 of the energy you use to heat and cool your home disappears through leaky ductwork. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.

But our erv ducts stand alone system not tied in w heat pump and 2 jumper ducts for pressure balancing from bedrooms are suspended above the insulation in our vented attic. She asked me to go into the attic to find the roof leaks or where the snow is blowing in through the soffits. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. To install preformed duct insulation start by disconnecting an elbow to expose the end of the duct.

Proper duct insulation is a major key to ensuring your home s energy efficiency. Unfortunately so many houses especially newer homes end up with ductwork running through the attic. Use metal flex or fiber board ducts that are insulated to. No building inspector worth his or her salt is going to let any builder or hvac contractor get away with installing ducts that aren t insulated.

Why is condensation on ductwork a problem. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. Why is this a problem. Duct insulation keeps air that s supposed to be cool cool and air that s supposed to be warm warm.

The greater the temperature extreme between the air inside the duct and the air surrounding the ductwork the greater your need for duct insulation. When hvac ducts are installed in a vented attic in a dry climate bury the ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space.