The OSCO Construction Group was founded by K.C. Irving and Hans W. Klohn in Saint John, New Brunswick in 1955 and has grown into a collection of companies operating in precast concrete, ready mix concrete & aggregates, structural steel, reinforcing steel and construction management. The OSCO Construction Group is one of Canada's most trusted contractors, fabricators, and erectors. Accomplishing exciting and intricate projects for industrial, institutional, commercial clients throughout Canada, and the Eastern United States.