Oldcastle BuildingEnvelope | 35,770 followers on LinkedIn. At Oldcastle BuildingEnvelope® (OBE), we believe the work of our employees truly matters. From apartments in New York to office buildings in Toronto, stadiums in Dallas, and universities in Atlanta, our teams contribute to the projects that shape the world where we live, work, heal, and play. Our vision is to be the first-choice provider of value-added, glazing solutions.