When testing SFRM thickness on a beam, how many thickness measurements are taken at each end of a specified length?

In the context of testing Spray-Applied Fire-Resistive Material (SFRM) thickness on a beam, the correct approach involves taking nine thickness measurements at each end of the specified length. This method is critical as it ensures that the SFRM has been applied uniformly and adequately to provide the necessary fire resistance.

By taking multiple measurements, you can account for any variations in application thickness that may occur. This is particularly important because irregularities could lead to insufficient fireproofing, potentially compromising the structural integrity in fire situations. Therefore, the requirement of nine measurements helps to ensure a thorough assessment of the fireproofing layer's effectiveness across the entire beam length.

This testing method aligns with best practices in the fireproofing industry, adhering to standards that aim for accuracy and reliability in fire resistance assessments. Hence, taking nine thickness measurements confirms compliance with quality control measures essential for structural safety under fire conditions.