Reliable OHD is a division of Allmar Inc. which was founded in 1957 in Winnipeg by Henry W. Redekopp who named the company after his two eldest children Albert and Margaret. Henry had emigrated to Canada in 1924 from the Ukraine. He was eleven years old and the youngest of six children. After graduating from high school in Winkler, Manitoba he settled in northeast Winnipeg where he purchased a small feed and grocery store in 1939 called the Roadside Store.

This small store with two employees eventually grew into a large general store and building material center called Redekopp Lumber and Supply. When selling a complete house package some products were difficult for customers to secure such as doors, windows and roofing, so Henry started expanding the product offering and selling these building products as well.