What is the required thickness test area when performing checks on SFRM?

The required thickness test area when performing checks on Spray-Applied Fire-Resistive Material (SFRM) is 48 square inches. This specification is crucial as it ensures that the test area is large enough to accurately represent the thickness and coverage of the fireproofing material. A larger test area helps to account for any inconsistencies in the application of the SFRM, providing a more reliable assessment of its fire-resistive properties.

Using a 48 square inch area allows for an adequate sample size to evaluate the uniformity of the application and to meet the requirements outlined in relevant codes and standards. This is important for ensuring safety and compliance in construction practices, as inadequate thickness can compromise the effectiveness of the fireproofing material in protecting structural elements during a fire event.