For a proper SFRM application, what is considered the critical factor during the inspection process?

Measuring thickness accurately is essential during the inspection process of Spray Applied Fire-Resistive Materials (SFRM). The thickness of the fireproofing application directly influences its effectiveness in providing the required fire resistance. Different structural elements may necessitate varying thicknesses to achieve compliance with fire protection standards based on the fire rating required for that specific application.

An accurate measurement ensures that the material meets the specifications set forth in fire resistance design criteria, thereby providing adequate protection to the underlying structure in the event of a fire. Inaccurate thickness could lead to under-performance of the fireproofing system, potentially compromising structural integrity and increasing risks during a fire incident.

Visual inspections alone don't provide enough information about thickness but can help identify obvious defects or surface issues. Evaluating drying time is also important but does not replace the need for accurate thickness measurements, as it primarily influences the performance characteristics rather than the thickness itself. Reassessment of bond strength is crucial for ensuring adhesion, but it doesn't directly address the fire-resistance capabilities dictated by thickness.