GCI specializes in the exterior building envelope.

This includes windows, glass, doors, walls, roofs, decks and other waterproofing elements. GCI's services include design, investigation, repair solutions, field water infiltration testing, new construction quality control, codes and standards consulting, and expert witness services. Our clients include building owners, developers, property managers, architects, engineers, contractors, manufacturers, insurance companies and attorneys. Our clients are located throughout the USA and internationally.