Congratulations, Keith Whigham, on achieving the Registered Roof Observer (RRO) credential through IIBEC. An RRO exhibits knowledge of roof observation principles for all roofing systems: built-up, single-ply, asphalt shingle, wood, sprayed polyurethane foam, tile, metal, and slate. The RRO credential assures knowledge about the basic methodology of quality assurance observation and a broad understanding of basic roof science, documentation and reporting, field testing observation, construction documents, roles, responsibilities, ethics, roof systems, and materials.