If the total thickness is 75mm and the primer is 8mm, what is the thickness of the SFRM?

To find the thickness of the Spray-Applied Fire-Resistive Material (SFRM), one must subtract the thickness of the primer from the total thickness. In this case, the total thickness is 75 mm, and the primer has a thickness of 8 mm.

Calculating the SFRM thickness involves the following steps:

1. Start with the total thickness: 75 mm.

2. Subtract the thickness of the primer: 75 mm - 8 mm = 67 mm.

Thus, the thickness of the SFRM is 67 mm. This calculation is important in the context of fireproofing because the proper thickness of the SFRM is critical for ensuring fire resistance according to building codes and safety standards. The choice of 67 mm is thus the most accurate measurement based on the provided information about the total thickness and the primer.