What is the minimum allowable TFIFRM thickness determination?

Determining the minimum allowable thickness for Thermal Fireproofing (TFIFRM) is essential for ensuring proper fire resistance and structural integrity in construction. A minimum threshold of 80% of the specified thickness is typically established based on industry standards and best practices. This percentage is designed to account for potential variations in application consistency and allows some margin for inaccuracies, while still ensuring that the fire-resistive properties are largely maintained.

By requiring a minimum of 80%, it balances the practical aspects of spray application—such as potential loss during application or settling—while ensuring sufficient protection against fire exposure. This standard also reflects a recognition that some applications may not achieve the full specified thickness due to various factors, but still provides a level of safety in fire risk scenarios.

Thus, adhering to this minimum allows for adequate protection while maintaining compliance with safety regulations and project requirements.