Creosote, the black or brown residue of combustion that collects over the internal surfaces of the chimney flue liner, is highly flammable. If allowed to build up, it might capture fire, resulting in cracks in "fireproof" brick, stone or clay flue liners and permit warmth to succeed in nearby wood framing https://chimney-repair-near-me89009.creacionblog.com/27953903/about-chimney-repair-near-me