Raths, Raths & Johnson, Inc. (RRJ) is a national engineering, architecture, and forensics consulting firm specializing in the investigation, design, repair, and field testing of building structures, enclosures, and materials. From decades of forensic investigative experience with building envelope and roofing systems, RRJ has developed proven strategies and comprehensive knowledge to address various types of roof performance, distress, damage and repair issues. RRJ’s roof consulting services range from condition and failure assessment to system selection and evaluation, construction drawings, and specifications for roof design, repair, or replacement. RRJ's capabilities extend into the construction phase with construction administration and inspection services to oversee compliance with quality and warranty expectations.