When would a drill bit be used for SFRM inspection?

The use of a drill bit during SFRM (Spray-Applied Fire-Resistive Material) inspection is typically associated with thickness testing, particularly in instances where high-density SFRM is involved. High-density fireproofing materials may require specific techniques to accurately measure their thickness, and drilling can provide precise measurements in accordance with industry standards.

When assessing the thickness of SFRM, it’s crucial to determine that the material has been applied to the required depth to ensure proper fire resistance. Core sampling, which is akin to using a drill bit, allows inspectors to take samples out of the sprayed material to measure thickness directly, thus confirming compliance with the design specifications and codes. This method is particularly effective for high-density materials, as they may have different application characteristics than lower-density options, necessitating specialized techniques for accurate assessments.

In situations where other factors such as adhesion, bond strength, or damage are the focus, other inspection methodologies or tools are more appropriate and effective. Thus, drilling specifically aligns with the need to measure the thickness of high-density SFRM precisely, making it the right choice in this context.