Insulate Heat Ducts In Attic

Inspect the span of ductwork to be insulated.

Insulate heat ducts in attic.

Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct. 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. Looking at the cooling side only the additional load would be. The rigid insulation was saturated from condensation.

Look for signs of air leaks at seams or joints such as streams of dust. Today s flexible ductwork is covered with a shiny metallic cover this is its vapor barrier. To insulate the exterior you have a choice between sleeve style insulation and blanket wraps which literally wrap around the ductwork. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place.

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. Plan to pull up the flooring and layer new insulation on top of the old. Use a paintbrush to apply duct mastic to the joints where an elbow. 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.

Hvac ductwork is typically visible in your attic especially flexible ductwork. 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. 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.

When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards. Make sure the foil surface of the insulation is free of dust before applying the tape. 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.

All the ducts are in the attic. R 8 duct insulation 5 227 btu hour. 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.

Because the simplest and cheapest way to insulate an attic is to add material to the floor. If necessary switch the wires to reduce the blower to its lowest.