Covering Flex Duct With Insulation

The foam provides a vapor barrier so the ductwork won t sweat.

Covering flex duct with insulation.

If there is damage to the metal or flex pipe duct repair it first. Use on rectangular and round ductwork. Install loose fill insulation to cover the ducts and the attic floor to meet or exceed the code required r value for attic insulation. Our duct wrap is available in a variety of densities thicknesses and with or without facings.

The duct insulation should include a vapor barrier cover. Seal all duct joints with foil faced duct tape. Cover the metal ductwork with closed cell spray foam. Download brochure pdf v 1540886844000 6 23 mb.

2 cut a piece of foil tape large enough to cover. Cover the spray foam with fire retardant spray. Apply k flex contact adhesive to the insulation surface and to the duct surface. 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.

This will prevent the penetration of humidity. 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. Clear away clutter that blocks your access to the air ducts. 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. Pull insulation and outer liner over the joint and seal to the attached duct or boot with mastic or foil tape figure 5. How to cover round air ducts with insulation 1. 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.

Consider adding more insulation as ductwork is farther from the furnace. Test total duct leakage. The cost and effort to add more insulation is minimal. Add additional sealant if necessary.

If you want to cover metal ductwork with blown in insulation t hese steps must be followed in this order. 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. 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.

If it s uninsulated you should insulated it to at least r 4 to r 8 for dfw.