The Wood Infestation Report will identify damaged wood when detected. The structural Inspection may not identify all the areas of deterioration unless there is loss of structural and load bering capacity. Vinyl siding does not typically require maintenance unless damaged. Replacement is the most common method of repair. Vinyl siding over natural wood can hide deterioration that is detectable only when the siding was installed, or if the siding is removed for inspection or repair.
Water entering air ducts that are below grade is both a common problem and a defective condition.
Access to the plenum usually requires a professional service person to open and properly reseal the compartment. Moisture into the Crawl space and Basement can be serious. However, the resulting problems can often be solved before there is lasting damage to the structure. Neither of these can be seen by the inspector unless the carpet and padding are removed for inspection. Seldom is the unfinished floor conveniently available for inspection.