What is the required gauge accuracy for SFRM testing?

The required gauge accuracy for Spray-Applied Fire-Resistive Materials (SFRM) testing is critical for ensuring that the fireproofing application meets the necessary safety and performance standards. A gauge accuracy of 1/16 inch is specified because it allows for precise measurement of the thickness of the fireproofing material. This level of accuracy is essential to ensure the proper application thickness is achieved, which directly affects the fire-resistance rating of the structure.

When the gauge accuracy is too coarse, such as 1/4 inch or 1/8 inch, it may not detect variations in thickness that could lead to areas being under-protected or over-protected, potentially compromising the effectiveness of the fireproofing. Additionally, a gauge accuracy of 1/32 inch might be overly stringent for practical applications, leading to unnecessary complexity without significant benefit in most scenarios. Thus, 1/16 inch provides an optimal balance of precision and practical usability in the field for SFRM testing.