Azek fitted its four-panel PVC column wrap with a bead-and-groove joining system that interlocks to avoid pounding the boards’ surface during installation. The wrap fits structural posts in 4-inch-by-4-inch, 6-inch-by-6-inch, and 8-inch-by-8-inch dimensions, and comes in 10-foot lengths. Its white-matte finish can be painted, and it doesn’t require additional milling.