DBI-SALA U-Bolt Permanent Roof Anchor* The U Bolt Roof Anchor is designed for permanent use on open trusses, joists and rafters so they'll be there for years to come. * This anchor comes complete with weather tight flashing and a cap which protects the anchor from corrosion by sealing it from the environment. * The cap also hides the anchor, which provides the homeowner with an aesthetically pleasing roof line. * The U Bolt Anchor simply installs by clamping onto an up to 2x8 roof truss,