When testing SFRM thickness on a joist, how many measurements are taken at each end of a 12 inch length?

When testing the thickness of Spray-Applied Fire Resistive Material (SFRM) on a joist, it is standard practice to take multiple measurements to ensure accuracy and consistency in the application. For a specified length of 12 inches, the correct approach involves taking seven measurements.

This method is important because it helps account for any variations in thickness that might occur due to the application technique, material settling, or other factors. By measuring at multiple points, it increases the reliability of the data collected and provides a more comprehensive understanding of the thickness throughout that length. The goal is to ensure that the applied fireproofing meets the required specifications for structural integrity and fire resistance. Achieving an accurate assessment using seven measurements enables thorough documentation and helps ensure compliance with safety standards.