Raths, Raths & Johnson, Inc. Email Format

Civil EngineeringIllinois, United States11-50 Employees

Raths, Raths & Johnson, Inc. is a civil engineering, architecture, and forensics consultancy that provides investigative, design, repair, and testing services for building structures, enclosures, and materials. Its professional staff combines structural engineers, architects, and field and laboratory technicians, enabling an integrated approach to evaluating and resolving issues related to structural, architectural, and building-system performance. The firm leverages building science knowledge alongside analytical and testing capabilities to diagnose problems and guide restoration and construction decisions.

Headquartered in Willowbrook, Illinois, RRJ serves clients across the United States, including owners, developers, and public agencies, by assessing conditions, recommending solutions, and validating performance. The company operates private laboratory and field testing capabilities, conducting tests ranging from standard ASTM methods to customized procedures for facade systems, curtain wall components, structural elements, and construction materials. In 2023 RRJ partnered with the National Park Service on a project to restore a house to its 1818 condition.

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