Manufacturer page.

USG Securock Brand Gypsum-Fiber Roof Board is a high-performance roof board for use in low-slope roofing systems. Its unique fiber-reinforced, uniform composition gives the panel strength and water resistance through to the core. USG Securock Brand Gypsum-Fiber Roof Board provides exceptional bond and low absorption in adhered systems and, with uniform composition, achieves high wind-uplift ratings with no risk of facer delamination. Made from 97% recycled material, USG Securock Brand Gypsum-Fiber Roof Board combines superior performance with sustainable design for all types of built-up roofing systems and most fluid applied, spray foam, metal and any polyester reinforced single ply or modified bitumen membrane systemsUSG Securock Brand Gypsum-Fiber Roof Board Panels provide a smooth, flat surface that resists swelling and warping often seen with wood-based Roof Boards, and contains none of the resins, adhesives or solvents that can stain floor covering materials. It also offers greater resistance to indentation than other roof board products and can be used throughout a home regardless of the flooring material chosen.