What is the minimum allowable average TFIFRM thickness for a beam requiring 48 mils of thickness?

The minimum allowable average thickness for fireproofing is typically based on the specified thickness required for effective fire protection. In this context, when a beam requires a thickness of 48 mils, achieving 100% of the specified thickness is essential to ensure that the fireproofing material provides the intended level of fire resistance.

Fireproofing materials are designed to perform optimally at their specified thickness. Applying the material at 100% of the specified thickness ensures that the beam can withstand the prescribed fire exposure scenarios, thereby maintaining structural integrity during a fire event.

In many building codes and fire safety regulations, such as those referenced in spray-applied fireproofing practices, it is mandated that the application must meet or exceed the specified thickness to qualify for the required fire ratings. Lower percentages, such as 75% or 90%, would not comply with these standards and could jeopardize fire resistance effectiveness. Therefore, maintaining the application at exactly 100% of the specified thickness is critical for compliance and safety.