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Fiberglass Insulation


Fireplace door insulation allows you to fill in the spaces between your door frame and the surrounding surface. Our black or white fiberglass insulation is available in widths of 1.5 or 2 inches and is available in 10 or 11-foot rolls. Use the entire length, or cut to size for smaller gaps. Our fireplace insert insulation is an easy-to-use, self-adhesive brand that forms a smoke-tight gasket between the door frame and your facing material.



How to Replace Insulation in Fireplace Doors

What will you need?

  • Screwdriver
  • Work gloves
  • Fireplace self-adhesive insulation strips

There should be no fire burning in your fireplace and the doors room temperature. We recommend having an additional person to help out.

STEP 1: Loosen the lintel clamps holding the door frame while your assistant supports the frame so it doesn't suddenly fall to the floor.

STEP 2: Wear your gloves to protect your hands from the fiberglass splinters and pull away from the old insulation stuck to the frame and/ or fireplace. If any sticky adhesive is left behind, scrape it off.

STEP 3: Apply the new, self-adhesive insulation around the frame.

STEP 4: Move the frame back into position with the lintel clamps and tighten the frame back over the fireplace opening. Screw the clamps until the insulation is pressed between the frame and the masonry of the fireplace.


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Can you insulate a fireplace?

  • You do have the ability to insulate your fireplace and most are insulated when built. The important part of insulation is your chimney. You will want to install the insulation around your chimney to help radiate the heat.

Is fiberglass insulation fire resistant?

  • Fiberglass insulation is fire resistant due to it is glass that is spun into fibers. This makes the insulation naturally fire-resistant. Although the fiberglass is resistant to fire and will not burn, you will need to still be cautious. There are additions to the fiberglass that may burn.

Should you insulate a chimney chase?

  • It is recommended that if you live in a colder climate that you can insulate the chimney chase to the top and the ceiling of the chase to keep the chimney warmer. This will also reduce the buildup of creosote.

How much heat can fiberglass take?

  • Fiberglass insulation is naturally heat resistant but can withstand to a certain temperature. The fiberglass insulation will begin to soften at around 1500°F and will melt at around 2050°F.