How to Insulate Metal Ducting in a Crawlspace

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    • 1). Measure the circumference of the ducting, which is the total of each side added together.

    • 2). Add to the circumference an allowance for the thickness of the insulation. Six inches is the allowance for standard duct insulation that is 1 1/2 inches thick.

    • 3). Cut your first piece of insulation at the above measurement. Lay it on the ground and slice through it with your utility knife for a quick, easy cut.

    • 4). Wrap the insulation around the ducting with the fiberglass facing toward the ducting and the foil facing away. Pull until tight.

    • 5). Tape the seam of the insulation with aluminum foil tape. Press firmly on the tape with a plastic squeegee to seal it to the foil facing.

    • 6). Cut and install additional pieces of insulation until all the ducting is wrapped. Ensure all seams are taped to achieve an airtight seal.

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