OAKVILLE — CGC Inc., a Canadian manufacturer of gypsum-based building materials and performance ceilings, announced that Sean Maynard has been appointed Plant Manager, Western Canada. In this role, Mr. Maynard will reportedly oversee CGC’s Western Canadian operations in Surrey, Port Kells, Calgary and Winnipeg, trying to lead the company’s manufacturing and distribution network across the region. The Wheatland facility will reportedly continue u…