How many SFRM thickness tests are required underneath metal decking for an area of 9,100 square feet?

The correct answer is based on established standards for fireproofing thickness tests, including the guidelines from the International Building Code (IBC) and the applicable ASTM standards. For an area of 9,100 square feet, testing requirements dictate that a minimum of one thickness test is required for every 1,000 square feet of area being fireproofed.

Thus, dividing the total area of 9,100 square feet by 1,000 gives us 9.1, which would require rounding up to the nearest whole number. Therefore, a total of 10 thickness tests is necessary to ensure comprehensive coverage and assessment of the spray-applied fire-resistive material (SFRM) thickness across the entire area. This ensures that the fireproofing is applied uniformly and meets safety regulations.

When considering other options, 5 tests would not provide a sufficient sampling across the entire square footage, leading to potential inconsistencies in fireproofing coverage. Similarly, 15 tests might be excessive, and 20 tests would go beyond the necessary requirement but could be deemed prudent in certain high-stakes environments, yet for the specific calculation related to this area, 10 is the minimum mandated for compliance.