PSI, an Intertek Company, is a leading provider of ATIC (Assurance, Testing, Inspection and Certification) Services. Ranked #15 on the 2019 ENR list of Top 500 Design Firms, and with more than a hundred offices across North America, the building and construction team provides the architectural, engineering and construction (A/E/C) industry with a full suite of capabilities both in the lab and on site. From testing, inspection and certification services to building sciences solutions, the company delivers Total Quality Assurance to the built environment.