Covering Flex Duct With Insulation

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Covering flex duct with insulation. 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. How to cover round air ducts with insulation 1. Cover the spray foam with fire retardant spray. Clear away clutter that blocks your access to the air ducts.

If there is damage to the metal or flex pipe duct repair it first. If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. Test total duct leakage. If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw.

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. Mechanically fasten and mastic seal all duct connections. We offer a range of fiberglass duct wrap solutions that provide traditional sheet metal ducts with improved thermal insulation. Apply k flex contact adhesive to the insulation surface and to the duct surface.

Seal all duct joints with foil faced duct tape. The foam provides a vapor barrier so the ductwork won t sweat. Consider adding more insulation as ductwork is farther from the furnace. Cover the metal ductwork with closed cell spray foam.

The cost and effort to add more insulation is minimal. Our duct wrap is available in a variety of densities thicknesses and with or without facings. 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. 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.

Use on rectangular and round ductwork. 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. 2 cut a piece of foil tape large enough to cover. Install loose fill insulation to cover the ducts and the attic floor to meet or exceed the code required r value for attic insulation.

Add additional sealant if necessary. This will prevent the penetration of humidity. Cut a second length of standard insulation batt to the length of the horizontal duct to cover the duct s underside. In some cases the insulation is flex board which itself is the pipe or duct.

The duct insulation should include a vapor barrier cover.