Symptom field notes
Excessive soot or suspected creosote
Unusual deposits or falling soot warrant assessment. Their appearance alone cannot establish whether a chimney is safe, clean or compatible with its appliance.
Never attempt to burn out deposits or use a cleaning product as a substitute for inspection.
What to document
- Where was the deposit noticed without reaching inside?
- What fuel and appliance are used?
- When was the last documented inspection?
Keep dates and observations separate from guesses about the cause. Photographs from a safe location and earlier service records are useful starting material.
What to ask the contractor
- What type and location of deposit did you observe?
- Is standard sweeping sufficient or is specialist removal needed?
- What underlying factors should be investigated?
Ask for findings, access limitations and recommended next steps in writing. A proposed product or repair method should follow an explanation of the observed condition.
From symptom to evidence
Ask what was found, where it was found and what remains
A cleaning proposal should distinguish the deposits the contractor expects to remove from conditions that need further assessment. Ask whether the quoted visit covers the relevant appliance, connector and flue, and whether more difficult removal would require a separately approved scope. Keep the before-and-after record tied to identifiable locations rather than comparing unrelated close-up pictures.
What a useful assessment record includes
- Request the observed location and description of deposits in the report.
- Ask which sections were reached and which were not accessible.
- Ask about unresolved findings and recommendations after the cleaning.
Does a bag of removed soot prove that the whole system is ready to use?
It shows material was removed, not the full boundary or findings of the visit. Ask for the completed scope, limitations and recommendations in writing. If specialist removal is proposed after routine sweeping, request the reason, method and separate price before approving it. Never try to remove deposits by deliberately creating a hotter fire.
Related observation: Suspected chimney or vent blockage. Similar observations do not establish the same cause.
Turn the observation into a comparable scope
Send the same brief to each company. Ask whether the appointment is an inspection, a diagnostic visit or a repair, and how additional work is approved. If proposals disagree, compare the evidence each contractor cites before comparing totals.