Restoration Millwork Details Create the Personality CertainTeed offers two types of trim that can be combined or used independently, enabling you to add customized elements to your exterior design. Restoration Millwork® cellular PVC adds authenticity to any home’s exterior; it cuts, mills, shapes and routs like top-grade lumber so it can be hand-crafted to create unique designs. It can also be painted with Sherwin-Williams VinylSafe™ paint colors, for even more design flexibility.