This industry comprises establishments primarily engaged in the merchant wholesale distribution of lumber; plywood; reconstituted wood fiber products; wood fencing; doors and windows and their frames (all materials); wood roofing and siding; and/or other wood or metal millwork. Merchant wholesale distribution of nonwood roofing and siding materials--are classified in Industry 423330, Roofing, Siding, and Insulation Material Merchant Wholesalers; and Merchant wholesale distribution of timber and timber products, such as railroad ties, logs, firewood, and pulpwood,--are classified in Industry 423990, Other Miscellaneous Durable Goods Merchant Wholesalers.
