What can be utilized instead of metal lath to create a mechanical break between SFRM and substrate?

The use of 12-gauge steel studs to create a mechanical break between Spray-Applied Fireproofing Material (SFRM) and the substrate is essential for ensuring the effectiveness of fireproofing systems. Steel studs offer a stable and reliable structural component that supports the fireproofing while allowing for necessary thermal expansion and contraction. This mechanical break helps prevent the direct transfer of stresses between the SFRM and the substrate, reducing the risk of damage to the fireproofing layer.

In contrast to metal lath, which can create continuity that might lead to stress concentrations, steel studs are designed to provide that break. They also help maintain proper adhesion and prevent any potential cracking or delamination of the SFRM during temperature fluctuations or structural movement.

The other materials listed, such as wooden beams, plywood sheets, and fiberglass panels, do not provide the same level of durability or structural integrity as steel studs. Wooden materials can warp or shrink with moisture and temperature changes, compromising the effectiveness of the fireproofing. Plywood and fiberglass panels may not be able to support the weight of the SFRM adequately or provide the necessary mechanical properties needed to maintain separation from the substrate effectively.