MISSISSAUGA, Ont. — Castle Building Centres Group Ltd. Has added its newest member, Rivest et Fils ltée, with four locations in Quebec, in the heart of the Lanaudière region, north of Montreal. The business was founded in 1969 by Claude Rivest in St-Jean de Matha, when the retail store was actually connected to the family home. Rivest et Fils constructed its first stand-alone location in St-Jean de Matha in 1975. In 1984, it acquired a sawmill that allows the company to produce its own spruce and white pine lumber, as well pinemouldings. Rivest et Fils was formerly with RONA.