What is Creosote?
Condensed wood smoke turned residue, ranging from black dust to a glassy tar, deposited inside the chimney flue wherever smoke meets cool walls. Stage 1 is dust, Stage 2 is crunchy, and Stage 3 is hard glaze, the form responsible for most chimney fires. Annual sweeping clears Stages 1–2, while Stage 3 takes restoration to remove.
