Which of the following is NOT a factor in determining the acceptance criteria for SFRM thickness?

The correct answer is that the location of the SFRM (Sprayed Fire-Resistive Material) installation is not a factor in determining the acceptance criteria for its thickness. The acceptance criteria primarily focus on characteristics intrinsic to the SFRM material and its application rather than the specific location where it is applied.

The specified thickness and density are critical in ensuring the SFRM meets fire resistance ratings; they directly correlate with the fire protection performance of the material. Likewise, the method of application affects how well the material adheres to surfaces and its overall effectiveness in fire protection. Each of these factors is essential to evaluate and establish criteria for thickness that contributes to the structural integrity and safety of the building in case of fire.

In contrast, while the location can influence the overall fire protection strategy (for example, whether it is applied in an indoor or outdoor environment), it does not directly affect the inherent thickness needed for effective fire resistance. Therefore, the primary considerations for SFRM thickness acceptance criteria are based more on material properties and application techniques than on the specific installation locale.