Homeowners Guide to Duct Insulation

Duct insulation can be made from various materials and come in many shapes, sizes, and forms. Common types of duct insulation include fiberglass, aluminum foil, rockwool, and XLPE.

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Here are three common types of duct insulation.

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Fiberglass is the part that actually insulates. However, it is held together by the aluminum foil backing.

This type is commonly used on round or square duct plenums, and branch runs. Each piece can be custom fit for a tight wrap, with duct mastic applied on the inside surface to seal each seam together.

Rockwool is a brand of insulation with the added benefit of soundproofing. It is a very durable material, making it the right choice to insulate HVAC ductwork.

Typically found on the inside of the furnace or air handler plenum, it keeps noise and air leaks to a minimum while not slowing down airflow too much.

Also known as XLPE, polyethylene foam is excellent for insulating sheet metal ducts exposed to the outdoors, as it is weather resistant, and its flexibility allows it to bend and insulate simultaneously.

The benefits of a properly insulated duct system include improved indoor air quality, which leads to a quieter, more efficient HVAC system, and a reduction in utility bills.

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