To what accuracy must SFRM thickness gauges read?

The correct answer indicates that SFRM (Spray-Applied Fire-Resistive Material) thickness gauges must read to the nearest 1/16-inch. This level of accuracy is crucial because fireproofing applications require precise adherence to specified thicknesses to ensure they meet safety and performance standards.

The fire-resistive materials must provide adequate protection against fire spread, and even slight variances in thickness can significantly impact the effectiveness of the material in a fire situation. Reading to the nearest 1/16-inch allows for the necessary precision to confirm that the application has achieved the desired protective properties.

In the context of fireproofing, maintaining the appropriate thickness is essential for compliance with building codes and regulations, which dictate the fire-resistance ratings that structures must achieve based on their use and occupancy type. Hence, ensuring that the gauges read accurately to this degree helps maintain the integrity and effectiveness of the fire-resistive application.