What is the square area of the test area when testing SFRM thickness on a deck?

The square area of the test area for measuring the thickness of Spray-Applied Fire-Resistive Material (SFRM) on a deck is conventionally set at 144 square inches, which corresponds to a square area of 12 inches by 12 inches. This dimension is used consistently within industry standards for testing to ensure that the fireproofing characteristics meet the required specifications for safety and building code compliance.

While other dimensions might exist, the standardization to 144 square inches helps maintain uniformity and reliability in testing procedures across different applications and environments. It ensures that inspectors and contractors are all using the same basis for measurement, which enhances the integrity of fire testing and performance assessment.