If a floor has 100 columns receiving SFRM, how many must be subject to thickness testing?

In the context of structural integrity and fireproofing practices, standard protocols often dictate how many samples should be tested to ensure the quality and compliance of fireproofing materials applied to structural components. For a situation where a floor has 100 columns treated with Spray-Applied Fire-Resistive Material (SFRM), industry guidelines commonly require a specific percentage of these columns to undergo thickness testing.

Choosing to test 25 columns, which represents 25% of the total, aligns with many quality control procedures found in specifications and codes that govern fireproofing applications. This testing ensures that the thickness of the SFRM adheres to safety standards necessary for achieving the desired fire resistance ratings. Conducting tests on this number of columns not only provides a representative sample of the overall application but also helps identify any inconsistencies or defects in the application process.

In practice, the selection of columns for testing might be based on a variety of factors, including their location, the conditions of application, and any prior issues noted during installation. By sticking to the specified percentage, it allows for efficient resource use while maintaining strict adherence to safety and performance standards required in structural fireproofing.