Inspection reports should describe the major home systems, their crucial components, and their operability, especially the ones in which failure can result in dangerous or expensive-to-correct conditions. Defects should be adequately described, and the report should include recommendations.  See Standards of Practice

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Reports should also disclaim portions of the home not inspected. Since home inspections are visual inspections, the parts of the home hidden behind floor, wall and ceiling coverings are disclaimed.

Home inspectors are not experts in every system of the home, but are trained to recognize conditions that require a specialist inspection.