What is the maximum number of thickness measurements less than specified thickness for SFRM testing?

For Spray-Applied Fire-Resistive Material (SFRM) testing, it is critical to ensure that the applied thickness of the fireproofing material meets the specified requirements for effective fire protection. The maximum number of thickness measurements that can be less than the specified thickness is one. This guideline ensures that if a measurement falls short of the required thickness, it can be accounted for in a controlled manner without automatically resulting in failure of the application.

Should a second measurement also fall below the specified threshold, it would indicate a more systemic issue with the spray application process, necessitating further investigation or corrective action. This approach emphasizes quality control and compliance with fire safety standards, ensuring that the structural integrity in terms of fire resistance is maintained without allowing too many discrepancies.

Understanding this limit is crucial for professionals working with SFRM, as it defines acceptable practices in terms of quality assurance during installation. The rationale behind a singular allowable measurement under the specified thickness aligns with maintaining safety standards while also providing a measure of flexibility for minor inconsistencies during the application process.