ATLANTA--(BUSINESS WIRE)--BlueLinx Holdings Inc. (NYSE: BXC), a leading U.S. wholesale distributor of building products, today announced a major expansion of its distribution partnership with Oldcastle APG, a CRH Company. This agreement doubles the BlueLinx RDI® Railing distribution footprint from eight to sixteen locations and adds MoistureShield® Decking to two new markets: Long Island, NY and Portland, OR. RDI® Railing coverage now includes Seattle, WA, Spokane, WA, Portland, OR, Cincinnati,.