How to Insulate a Fireplace

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Your fireplace can help cut down on fuel bills.
Your fireplace can help cut down on fuel bills. (Image: Jupiterimages/Photos.com/Getty Images)

The more efficiently your fireplace operates, the more likely it is that you can use it to help heat up small areas of your home. When these areas get extra heat, you can sometimes turn your home’s heating system way down or even off. Throughout a heating season, this can help you save quite a bit of energy and money. There are a few things you can do to make your fireplace more efficient, starting with insulation.

Things You'll Need

  • Damper
  • Butyl rubber caulk
  • Ceramic glass doors
  • Flue plug

Replace the damper on your fireplace. The damper traps in hot air after the fire in your fireplace is out. Replacing an old or worn out damper with a new one will help to insulate your fireplace.

Seal the edges around your fireplace and hearth by caulking all around these areas with a butyl rubber caulk. The area you should caulk is located where the fireplace brick or stone meets with your house structure.

Install ceramic glass doors to the outside of your fireplace. Once the fire is out, close these doors to insulate the fireplace and prevent the warm air in your home from escaping up the chimney. The tighter the doors fit, the more effective they will be at insulating your fireplace.

Place a plug inside the flue of the chimney of your fireplace during the time of year when you won’t be using it. Insulate this plug by caulking around it with the butyl rubber caulk. At the beginning of the cold season, remove the caulk and the plug from the flue.

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