MISSISSAUGA, Ont. — Castle Building Centres Group Ltd. welcomes a new member, Wolf Creek Building Supplies Ltd., a lumber and building materials retailer and manufacturer owned and operated by John deRegt and his family. The business has two retail locations in Alberta. The first is a full-service 9,000-square-foot lumber, building materials and hardware outlet in Lacombe that sits on five acres. The second is a designer window and door showroom in Red Deer…