Soot
The black carbon residue produced by incomplete combustion during a fire.
Soot is the fine black carbon residue left behind when something burns without enough oxygen to burn completely. It rides the smoke, settles on every surface in the affected path, and is the thing a tech is actually wiping off walls, ceilings, and contents after a fire.
What it looks like in the field
Soot is not one thing. What fueled the fire changes how the residue behaves, and that changes the cleaning method:
- Dry soot from a fast, hot, oxygen-rich fire is powdery and sits loose on the surface. It usually comes off with dry methods first, chem sponge and HEPA vacuum, before anything wet touches it.
- Wet soot from a slow, smoldering fire is greasy and smeared. It bonds to the surface and needs solvent or degreasing cleaners.
- Protein residue from a kitchen fire is nearly invisible, yellowish, and carries a strong odor. Techs find it by smell and feel more than by sight.
The common rookie mistake is going wet too early. Wiping dry soot with a damp rag drives it into the pores of the paint and turns a cleanable wall into a sealed and repainted wall.
How it shows up on an estimate
Soot drives the cleaning scope, not just a single line. It shapes wipe-down line items by surface type, HEPA vacuuming, contents cleaning, sealing where cleaning cannot fully remove staining, and deodorization at the end. Adjusters generally want the affected area documented room by room with photos showing the residue before anything is touched.
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