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 Create up, it could catch fire, triggering cracks in "fireproof" brick, stone or clay flue liners and allow warmth to achieve nearby wood framing and various https://masonryrepair90865.liberty-blog.com/28180464/brick-repair-near-me-things-to-know-before-you-buy