If there are 100 columns on a floor receiving SFRM, what is the minimum number of columns that must be thickness tested?

To determine the minimum number of columns that must be thickness tested when 100 columns are receiving spray-applied fire-resistive materials (SFRM), it is essential to refer to the relevant codes and standards that govern such inspections.

According to general industry standards, particularly those that relate to the inspection of fireproofing, the minimum requirement often stipulates that a percentage of the elements be tested to ensure compliance with the specified thickness and overall quality of the applied fireproofing material.

In this scenario, the standard practice typically requires that a certain percentage of the total number of columns be thickness tested, often quoted as 25% for similar applications. Therefore, for 100 columns, calculating 25% results in needing to test a minimum of 25 columns. This approach ensures that there is a reasonable sample size which can accurately reflect the application quality across the entire set of columns.

By adhering to this standard, the inspection can effectively verify that the SFRM has been applied to the correct thickness, thus ensuring compliance with fire safety regulations. This testing process is vital for maintaining structural integrity and fire resistance in buildings, hence the importance of such a requirement.