The installed banding and fabric support system allows roof cavities to be completely filled with two layers of insulation with minimal insulation compression. When installed in strict compliance with the Bi-Directional Banding Roof Installation Instructions, OptiLiner® meets the requirements of OSHA Standard 29 CFR 1926.754(e) (3)(i) covers for roof and floor openings, and is used in both new construction and retro-fits.