What is the required number of thickness measurements to be taken at each end of a 12-inch length of beam?

To determine the required number of thickness measurements to be taken at each end of a 12-inch length of beam, it's essential to understand the measurement process in this context. When conducting thickness measurements, especially for spray-applied fireproofing, it’s recommended to follow a systematic approach to ensure accuracy and thoroughness.

In this case, each end of the beam should feature measurements that take into account multiple points along its thickness. Typically, the National Fire Protection Association (NFPA) guidelines suggest taking measurements at specified intervals along the beam to identify any variations in thickness. For a 12-inch length of beam, the practice often involves measuring at predetermined points, leading to a total count of measurements that helps provide a reliable assessment.

Taking nine measurements at each end allows for a comprehensive evaluation of the thickness. This method captures any inconsistencies in the application of fireproofing material, ensuring that the structural integrity and fire resistance are adequately met across the entire length of the beam.

The choice of nine measurements is optimal, balancing thoroughness with practicality, ensuring that all necessary data points are covered to assess the coating properly. This approach highlights the importance of accuracy in fireproofing application to maintain safety standards in construction and building practices.