How to Insulate Elbow Ductwork

The proper installation of ductwork insulation is just as important as the insulation of walls and ceilings.

Flexible insulation is the best to use for ductwork elbows and joints.Flexible insulation is the best to use for ductwork elbows and joints.
Properly placed ductwork insulation can help save you money on heating and cooling costs by improving the efficiency of your air conditioner and heater, because it will eliminate escaping cold and hot air. The insulation of ductwork elbows, because of the angles at which they bend, can be tricky. These steps will help you handle the task.

Clean the elbow junction you plan to insulate by either scrubbing it with a wire brush or rubbing it down with sandpaper.

Wipe the elbow clean and dry with old rag.

Cut a length of flexible aluminum insulation to fit the ductwork elbow.

Wrap the cut length of insulation around the elbow and seal it tightly with duct tape.

Things You Will Need

  • Sandpaper
  • Flexible aluminum insulation
  • Scissors or utility knife
  • Duct tape

About the Author

Ashton Daigle, a New Orleans native, graduated from Southeastern Louisiana University in 1998 and went straight to work as a journalist. In 2005 he tackled the biggest news story of his life - Hurricane Katrina. Daigle is writing a collection of essays: What It Means to be a Saints Fan.