Insulate Heat Ducts In Attic

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

Insulate heat ducts in attic.

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. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. The rigid insulation was saturated from condensation. Use a paintbrush to apply duct mastic to the joints where an elbow.

Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. R 8 duct insulation 5 227 btu hour. The shiny vapor barrier will protect the ductwork from sweating as long as it s exposed to the surrounding air. Check the speed of the blower motor on the furnace.

Because the simplest and cheapest way to insulate an attic is to add material to the floor. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. According to rightsuite the software we use the supply ducts have about 560 square feet of surface area and the return ducts 101 square feet.

Look for signs of air leaks at seams or joints such as streams of dust. Inspect the span of ductwork to be insulated. To install sleeves you must either disassemble the ductwork and slide it on before reassembling the ducts or as many homeowners find themselves doing slit it and wrap it around like the blanket style material. To insulate the exterior you have a choice between sleeve style insulation and blanket wraps which literally wrap around the ductwork.

Looking at the cooling side only the additional load would be. 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. But if the floor is covered in plywood you can t stuff enough insulation beneath it to do the job sufficiently not even in warm climates. 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.

All the ducts are in the attic. How to insulate your central air heating ducts 1. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place. 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.

Today s flexible ductwork is covered with a shiny metallic cover this is its vapor barrier. Hvac ductwork is typically visible in your attic especially flexible ductwork.