What is the minimum number of accuracy checks required for TFIFRM gauge thickness during an inspection shift?

In the context of spray-applied fireproofing inspections, the accuracy of thickness measurements is crucial for ensuring that the applied fireproofing meets the specified requirements for fire resistance. Using a TFIFRM gauge, it is standard practice to conduct multiple accuracy checks during an inspection shift to validate the gauge's performance and reliability.

The minimum number of accuracy checks required is three. This precaution helps to address any variability or potential inaccuracies that may arise during the application process or due to environmental conditions. By performing three checks, the inspector can establish a more consistent reading, ensure that the gauge is functioning correctly, and catch any discrepancies early. These checks are a fundamental part of maintaining quality assurance for fireproofing applications and ensuring compliance with applicable standards and codes.

This emphasis on multiple checks helps safeguard against using miscalibrated equipment, which could lead to insufficient fireproofing thickness and increased fire risk. Thus, the requirement for at least three accuracy checks is set to reinforce these critical safety measures in building construction.