In what situation would a drill bit be used during SFRM inspection?

Using a drill bit during SFRM (Spray-Applied Fire-Resistive Material) inspection is particularly important when it comes to thickness testing high-density SFRM. High-density fireproofing materials can be more challenging to evaluate visually or through other non-intrusive methods, especially when ensuring compliance with fire-resistance ratings and building codes.

By employing a drill bit to remove a small sample of the SFRM material, inspectors can accurately measure the thickness and ensure that it meets the specified requirements. This process allows for a precise determination of whether the application of SFRM is sufficient to provide adequate fire protection for the structural elements beneath it.

In contrast, measuring the thickness of low-density SFRM, inspecting for visual defects, or determining substrate materials may not require the use of a drill bit, as those assessments can often be conducted through less invasive techniques or standard visual inspections. Therefore, the most appropriate scenario for using a drill bit during SFRM inspection is for accurately assessing the thickness of high-density SFRM.