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

Using 12-gauge steel studs as a mechanical break between Spray-Applied Fire-Resistive Material (SFRM) and the substrate is effective due to their strength and stability. Steel studs provide a robust framework that can accommodate and support the SFRM, while also acting as a thermal break to reduce the transfer of heat between the structure and the fireproofing material. This mechanical separation is essential for ensuring that the fireproofing remains intact and effective during extreme heat conditions, which helps maintain the structural integrity of the building.

Other materials like wooden boards, plastic sheeting, and fiberglass reinforcements may not provide the same level of structural integrity or thermal performance needed in fireproofing applications. Wooden boards can be susceptible to fire damage and may not sustain heavy loads as effectively. Plastic sheeting lacks structural support, while fiberglass reinforcements, although strong, may not offer the level of mechanical break needed and could be less effective in handling temperature fluctuations compared to steel studs. Therefore, using 12-gauge steel studs is a reliable choice that aligns with best practices in fireproofing for maintaining safety and performance standards.