The statement 'The minimum TFIFRM thickness determinations must be 80% of the specified thickness' is true.

• A. True
• B. False
• C. Not sure
• D. Not applicable

Answer: (A)

The key idea is how field thickness verification for fireproofing is accepted. In practice, when inspectors check the applied TFIFRM, they verify that the thickness is not merely close to the specified value but meets a practical acceptance threshold that accounts for measurement variability and surface irregularities. The standard criterion is that the measured thickness must be at least 80% of the specified thickness. This means if the project calls for a 1-inch thickness, a measurement of 0.80 inch or more is acceptable, while a reading below 0.80 inch would indicate under-application and require corrective work. The 80% rule provides a reasonable balance between ensuring adequate fire protection and recognizing the realities of field measurements and surface conditions.