Why would someone install plywood in some areas and some sort of thermal reflective barrier in other areas of the sub-floor of a crawl space? There were some openings from which I could confirm the presence of fiberglass batt insulation. This is totally unorthodox in this area of the country and I don’t like it because it conceals the structure from inspection for possible defects. Other than that, is there a downside to having it installed? Would you recommend its removal?