Oldcastle BuildingEnvelope®, a CRH company, is the leading North American supplier of value-added, glazing-focused products and services specified to close in a structure; provide access, security and safety to the structure; and finish out the interior. This includes fabricated glass, architectural hardware and architectural metal systems. CRH is the leading building materials business in the world, employing c.90,000 people at c.3,700 operating locations in 32 countries. It is the largest building materials business in North America. CRH manufactures and supplies a range of integrated building materials, products and innovative solutions which can be found throughout the built environment, from major public infrastructure projects to commercial buildings and residential structures.