This U.S. Census Bureau NAICS-based industry comprises establishments primarily engaged in the merchant wholesale distribution of building and construction paper, plastics building materials, prefabricated nonwood structural assemblies, including modular homes, and other building materials.

Cross-References. Establishments primarily engaged in--

• Selling ready-mix concrete--are classified in Industry 327320, Ready-Mix Concrete Manufacturing;
• Merchant wholesale distribution of nonwood roofing and nonwood siding and insulation materials--are classified in U.S. Industry 423330, Roofing, Siding, and Insulation Material Merchant Wholesalers;
• Merchant wholesale distribution of structural metal products, excluding structural assemblies--are classified in NAICS Industry 42351, Metal Service Centers and Other Metal Merchant Wholesalers;
• Merchant wholesale distribution of cement, lime, and asphalt mixtures--are classified in U.S. Census Bureau N AICS-based industry 4233203,Cement, Lime, and Related Products Merchant Wholesalers;
• Merchant wholesale distribution of wood or metal millwork, wood siding, wood roofing, doors, windows, and their frames--are classified in U.S. Census Bureau NAICS-based industry 4233103, Plywood, Veneer, Millwork, and Wood Panel Merchant Wholesalers;
• Merchant wholesale distribution of sand, gravel, and stone--are classified in U.S. Census Bureau NAICS-based industry 4233202, Sand, Gravel, and Stone Merchant Wholesalers; and
• Merchant wholesale distribution of brick, block, and clay construction materials--are classified in U.S. Census Bureau NAICS-based industry 4233201, Brick, Block, Tile, Clay/Cement Sewer Pipe Merchant Wholesalers.