Short answer
Professional home inspectors write inspection comments using a four-part structure: observation, consequence, recommendation, and optional code reference. They pull from a pre-built library of 8,000+ liability-safe phrases, customized per inspector and per region.
Long answer
The four-part structure: (1) Observation — what the inspector saw, in factual present tense. (2) Consequence — why it matters. (3) Recommendation — evaluation by a licensed [trade] contractor. (4) Optional reference — NEC, IRC, EPA action level, manufacturer spec. Inspectors maintain a personal comment library that grows over their career. Modern inspection software lets them search the library by keyword, attach default photos, and version-control their voice.