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LIMITATIONS • USG Securock Gypsum-Fiber Roof Board is engineered to perform within a properly designed roof system.The use of USG Securock Gypsum-Fiber Roof Board as a roofing component is the responsibility of the design professional. • Consult roofing manufacturers for specific instructions on the application of their products to USG Securock Gypsum-Fiber Roof Board.For fully adhered fiberglass reinforced membranes consult the membrane manufacturer. • Weather conditions,dew,application temperature,installation techniques and moisture drive can have adverse effects on the performance of the roof system and are beyond the control of USG. • Keep USG Securock Gypsum-Fiber Roof Board panels dry before,during and after installation. USG Securock Gypsum-Fiber Roof Board should not be installed during rain,heavy fog and any other conditions that deposit moisture on the surface of the board.Apply only as much USG Securock Gypsum-Fiber Roof Board that can be covered by final roof membrane system in the same day.Avoid exposure to moisture from leaks or condensation. • Wind uplift(vertical pull)of the roof system as installed can be affected by many factors beyond USG's control,including moisture migrating into the roof assembly from inside or outside the building,proper fastener spacing,the quality of installation especially for fasteners and whether the framing has been properly designed and installed to meet strength and deflection criteria specified in the contract documents.For all these reasons,USG cannot guarantee the wind-uplift resistance(vertical pull)of any roof assembly or system containing USG roof boards. • Moisture from inside the building can be as big a risk for the roof system as moisture from outside. The contractor installing the roof and the design professional should protect the roof assembly not only from excessive moisture during the construction of the building(new concrete,paint,plaster materials)but also after the building is dried in.The HVAC system must properly manage moisture generated by the occupants of the building to make sure it is vented to the outside and does not migrate into the roof system. • Panel spacing may be needed based on factors like roof deck's size,membrane color,ultimate deck surface temperature and time of year the roof is installed.The designer of record should use USG's published physical properties below to determine if spacing is needed. • For reroof or re-cover applications,existing roofing system must be dry throughout prior to application of USG Securock Gypsum-Fiber Roof Board. • Plastic or poly packaging applied at the plant to protect board during rail or other transit should be removed upon receipt to prevent condensation or trapping of moisture,which may cause application problems. • USG Securock Gypsum-Fiber Roof Board should be stored flat and off the ground with protection from the weather.If stored outdoors,a breathable waterproof covering should be used. • When applying solvent-based adhesives or primers,allow sufficient time for the solvent to evaporate to avoid damage to roofing components. • USG allows the bonding of cold mastic-modified bitumen,low rise urethane foam and torching directly to the surface.Consult with the system manufacturer for recommendation on these applications. • USG recommends maximum asphalt application temperature for Type III or Type IV asphalt of 455° F when using USG Securock Gypsum-Fiber Roof Board.Application temperatures above these recommended temperatures may adversely affect roof system performance. FIRE PERFORMANCE • UL Classified(Type FRX-G)as to Surface Burning Characteristics in accordance with ASTM E84 (CAN/ULC-S102). —Flame Spread 5 and Smoke Developed 0 • 1/4",3/8",1/2"and 5/8"thickness—Class A in accordance with UL790(CAN/ULC-S107). See the UL Building Materials Directory for more information. • 5/8"thickness—Meets requirements of Type X per ASTM C1278 and may be used in P series designs as a thermal barrier. SYSTEM PERFORMANCE • FM Approved —Complies with requirements of FM 4450 and FM 4470 —Meets FM Class 1 STANDARDS COMPLIANCE USG Securock Gypsum-Fiber Roof Board is manufactured to conform to ASTM C1278,"Standard Specification for Fiber-Reinforced Gypsum Panel." C 21