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Before you blanket the ductwork, use foil tape to seal every opening and joint in the ducts. This is not optional.

Next, you will need special foil-lined insulation wrapped around the exterior of the ductwork. Often installers use "stovepipe wire" to hold the insulation in place. It is vital that you seal all joints and holes in the insulation, especially for air conditioning, or moisture will enter and condense on the colder ducts and ruin your insulation.

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14y ago
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1y ago

There are a few ways to insulate ductwork. One option is to use insulation sleeves, which are pre-cut tubes that can be easily slid onto the ducts. Another method is to wrap the ducts with insulation blankets, which are then secured with tape or wire. It's important to choose insulation material with the appropriate R-value for your climate and to properly seal any joints or seams to ensure maximum effectiveness.

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Q: How do you insulate ductwork?
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It is important if your basement is unconditioned space. If your basement walls and floor are insulated it is not so important.


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You insulate any ductwork where you want to control the temperature diffences between the inside and outside of the duct. One example would be the combustion air duct, usually a round sheet metal line that comes from the outside and ends near the furnace and/or water heater. Typically this would be insulated with fiberglass padding held in place with a plastic coating. Larger, rectangular ductwork can be insulated with internal or external insulation, not always fiberglass, of verying thicknesses.


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I need to insulate the garage door before summer. Will you insulate him from the hecklers?


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No, Kevlar is an insulator.


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Frances wanted to insulate his house with loft insulation.


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Insulators is a plural noun.