UHMW is inpossible to discover below but there's yet another way about this problem. In place of aquiring a gap pipe as a roller you may have many three/four circles having a washer among them so they act and shift independently. Radiant barrier plywood is most often used for roofing. https://juliuszxrdm.jts-blog.com/31733844/the-smart-trick-of-plywood-that-no-one-is-discussing