Covering Flex Duct With Insulation

If there is damage to the metal or flex pipe duct repair it first.

Covering flex duct with insulation.

Pull insulation and outer liner over the joint and seal to the attached duct or boot with mastic or foil tape figure 5. Cut a second length of standard insulation batt to the length of the horizontal duct to cover the duct s underside. Ecotouch insulation for flexible duct owens corning ecotouch insulation for flexible duct is a lightweight flexible resilient thermal and acoustical insulation made of inorganic glass fibers bonded with a thermosetting resin. Consider adding more insulation as ductwork is farther from the furnace.

The foam provides a vapor barrier so the ductwork won t sweat. If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw. Cover the spray foam with fire retardant spray. Test total duct leakage.

In some cases the insulation is flex board which itself is the pipe or duct. Installing contractors prefer it for many reasons including improved handling easier cutting and less dust. We offer a range of fiberglass duct wrap solutions that provide traditional sheet metal ducts with improved thermal insulation. Use on rectangular and round ductwork.

How to cover round air ducts with insulation 1. Seal all duct joints with foil faced duct tape. Duct insulation sheets typically used as duct wrap these flexible sheets consist of polyethylene bubbles covered with aluminum polyester foil that prevent 96 of heat from radiating into or away from duct. To attach flex duct pull back the outer liner fasten the inner liner over the collar with a tool tightened tension tie and mastic seal the connection.

In the example given for the best results we recommend first insulating the lower surface of the duct then the side walls and lastly the top. Download brochure pdf v 1540886844000 6 23 mb. Cover the metal ductwork with closed cell spray foam. Apply k flex contact adhesive to the insulation surface and to the duct surface.

Add additional sealant if necessary. This will prevent the penetration of humidity. Clear away clutter that blocks your access to the air ducts. Mechanically fasten and mastic seal all duct connections.

If you need to bury the ducts in insulation the only safe way to do it is to first install a 2 inch layer of closed cell spray foam on the outside of the ducts. Install loose fill insulation to cover the ducts and the attic floor to meet or exceed the code required r value for attic insulation. 2 cut a piece of foil tape large enough to cover. The best way to address poorly insulated attic ducts is to replace older flex duct with newer flex duct with a higher r value at least r 8.

Our duct wrap is available in a variety of densities thicknesses and with or without facings.