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Help to identify this chimney patch material?

homeowner007 | Posted in Energy, Heating & Insulation on

I’ve attached an image of a patch in the chimney of our 1920’s house. My guess is that it covers the flu left when switching from a coal-fired furnace to natural gas. It’s kind of spongy – which I associate with asbestos. Any idea what this material could be? I’d like to remove it and patch the bricks up properly. Thanks in advance for your advice.

Replies

  1. TheRealOhioMike | | #1

    Looks like mortar. In the early 20th century they use to mix lime and other additives to mortar. Maybe a little asbestos mixed in?

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