TUSTIN, Calif.--(BUSINESS WIRE)--Foundation Building Materials, Inc. ("FBM" or the "Company") (NYSE:FBM), one of the largest specialty distributors of wallboard, suspended ceiling systems, and mechanical insulation in North America, announced today that it has acquired Agan Drywall Supply, Inc., Agan Drywall Supply Rapid City, Inc., and Agan Tri-State Drywall Supply, Inc. (collectively, "Agan"). Agan is a leading independent distributor of drywall, steel framing, Sto coatings and EIFS, stucco,