Which of the following can be used to create a mechanical break between SFRM and substrate?

Using 12-gauge steel studs to create a mechanical break between Spray-Applied Fire-Resistive Material (SFRM) and substrate is an effective choice due to their structural integrity and compatibility with fireproofing materials. The studs help to provide a stable framework that can securely hold the SFRM while allowing for proper expansion and contraction, reducing the risk of cracking or failure in the fireproofing layer. This mechanical break is crucial in maintaining the effectiveness of the fireproofing system, especially in dynamic environments where movement can occur.

Other materials, while they may seem viable for creating a mechanical break, do not provide the same level of strength, support, or fire-resistance properties as steel studs. For example, wood planks may not have sufficient durability or resistance to various environmental conditions, while fiberglass sheets might lack the necessary structural support. Additionally, metal lath is often used as a reinforcing element but does not serve as an effective mechanical break by itself. Therefore, steel studs are the most appropriate choice for ensuring a reliable and efficient mechanical separation in fireproofing applications.