Restoration Millwork cellular PVC square porch column wraps from CertainTeed Corp. slide around existing posts. The wraps are pre-cut, pre-mitered and pre-assembled to ensure quick application to existing load-bearing wood porch posts. They come in a smooth, natural white finish with two traditional cap and base trim set styles – classic and estate. Eight by 8-in. and 10- by 10-in. widths with a standard 9-ft. height are available.