Leaky ductworks are a problem because they waste energy and raise your home’s heating and cooling costs.

Fortunately, fixing this problem couldn’t be easier, and it requires minimal expense.

Here’s how to seal holes or tears in ductwork:

Locate Leaks: Turn on the HVAC fan and touch the ductwork. Feel it up and down and check for drafts that indicate escaping air.

Seal Leaks: Turn off the fan and apply special metallic foil tape over the hole or gap. Don’t use standard duct tape, since the adhesive will come loose over time. Purchase the metallic foil tape that’s specifically made for ductwork repairs.

Apply Duct Mastic: Use a brush to apply duct mastic over the tape and joints to improve the seal.

Watch this video to find out more.

Leaks in ductwork are often found where lines branch off or separate. With the furnace fan running, you can feel air escaping the duct. Once you’ve found the leak, use foil duct tape to cover the gap and seal the leak.

For an extra layer of protection, use a paintbrush to apply a coat of duct mastic. This thick, sticky material will dry to form an airtight seal that will keep the air in those ducts, where it belongs.

Further Information

Editorial Contributors
Danny Lipford

Danny Lipford


Danny Lipford is a home improvement expert and television personality who started his remodeling business, Lipford Construction, at the age of 21 in Mobile, Alabama. He gained national recognition as the host of the nationally syndicated television show, Today's Homeowner with Danny Lipford, which started as a small cable show in Mobile. Danny's expertise in home improvement has also led him to be a contributor to popular magazines and websites and the go-to source for advice on everything related to the home. He has made over 200 national television appearances and served as the home improvement expert for CBS's The Early Show and The Weather Channel for over a decade. Danny is also the founder of 3 Echoes Content Studio, TodaysHomeowner.com, and Checking In With Chelsea, a décor and lifestyle blog.

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