Defect type
Critical · 3–5/5
Heater or Flue Installed Too Close to Combustible Framing
I measured the clearance from a solid-fuel heater, gas space heater, or flue pipe to adjacent timber studs, joists, or battens and found it below the manufacturer's compliance plate values. Over repeated burn cycles this heat soak can pyrolyse the timber and lower its ignition point. Reference: AS/NZS 2918 for flue clearances. The risk is hidden until charring or smoke appears.
Causes
- DIY installation without reference to the appliance manual or AS/NZS 2918
- Renovation enclosed a previously open flue run inside a new stud wall
- Original non-combustible hearth or shield removed and replaced with timber or MDF trim
Symptoms to look for
- Scorch marks, discolouration, or charring on framing near the appliance or flue
- Visible clearances well below the compliance plate values on the appliance
- Combustible skirting, architrave, or timber lining terminating flush against the heater body
Remedies
- Isolate the appliance and engage a licensed gas or solid-fuel installer to reassess clearances
- Rebuild the surround with non-combustible lining and proper air gap per the appliance manual
- Replace any timber framing that shows charring or heat damage before recommissioning
Critical
Get an inspector through this property.
Findings in this category skew high severity. If you are under contract, we can usually book inside the cooling-off window. Every inspection includes 12 months of free advice.
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