In an area of 8,000 square feet receiving SFRM application, how many columns need to be tested for bond strength?

In the context of testing the bond strength of Spray-Fire-Resistant Materials (SFRM) applied over a specific area, industry standards typically dictate the number of columns to be tested based on the total square footage of the application. For an area of 8,000 square feet, the requirement is usually to perform bond strength tests on a representative sample of columns to ensure that the application adheres properly and meets quality standards.

The standard practice involves testing a specific number of columns for bond strength relative to the size of the area covered. In many guidelines, this number is determined based on statistical sampling methods to achieve reliable results while minimizing the testing burden. Four bond strength tests represent a typical approach, reflecting a balance between thoroughness and efficiency, enabling an accurate assessment of the fire protection capability of the SFRM applied.

Thus, testing four columns allows for a sufficient pool of data to analyze the bond quality across the covered area, ensuring compliance with safety standards while providing an adequate representation of the overall installation's integrity.