The IRC is a model residential code that jurisdictions can adopt and amend. NFPA 211 is a consensus standard. Depending on the job, adopted codes may reference standards, while listings and manufacturer instructions can add another controlling layer.
A strong report identifies the source of a conclusion. Instead of writing “not to code” without support, identify the observed condition, the relevant source, the edition when known, and any limitation on the inspection.
When sources appear to conflict, do not choose the answer that best supports a repair sale. Slow down, verify the adopted requirements and manufacturer documentation, and escalate to the authority having jurisdiction or other qualified expertise when necessary.
Use the official source
VerifySweep summarizes concepts for professional education. It does not reproduce or replace copyrighted code or standard text. Consult the official publication for exact requirements.
Educational content only. Codes, standards, listings, manufacturer instructions and local amendments can change which requirement applies to a specific installation.