ATLANTA--(BUSINESS WIRE)--BlueLinx Holdings Inc. (NYSE: BXC), a leading U.S. wholesale distributor of building products, today announced that it is expanding RDI® railing distribution to eight additional locations in key U.S. markets, bringing the company's total RDI distribution footprint to 21 locations. The expansion advances BlueLinx's Outdoor Living specialty products growth strategy by better pairing a category-leading railing brand with the company's national and local market customer ba.