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

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Multiple Choice

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

Creating a mechanical break between SFRM and the substrate means providing a stable, nonbonding gap so the coating isn’t bonded directly to the surface and can move without cracking. A 12-gauge steel stud framework attached to the substrate serves as a durable, noncombustible backing that defines and maintains that gap. This rigid backing decouples the SFRM from substrate movement and stresses, helping prevent cracking, spalling, or debonding of the fireproofing. Wood spacers, cardboard filler, and plastic film aren’t suitable for this purpose. Wood is combustible and can deform or burn under heat; cardboard would degrade or ignite; plastic film isn’t a reliable, durable spacer and can trap moisture or fail under fire exposure. The steel stud framework provides the necessary structural support and fire-rated performance to establish a lasting mechanical break.

Creating a mechanical break between SFRM and the substrate means providing a stable, nonbonding gap so the coating isn’t bonded directly to the surface and can move without cracking. A 12-gauge steel stud framework attached to the substrate serves as a durable, noncombustible backing that defines and maintains that gap. This rigid backing decouples the SFRM from substrate movement and stresses, helping prevent cracking, spalling, or debonding of the fireproofing.

Wood spacers, cardboard filler, and plastic film aren’t suitable for this purpose. Wood is combustible and can deform or burn under heat; cardboard would degrade or ignite; plastic film isn’t a reliable, durable spacer and can trap moisture or fail under fire exposure. The steel stud framework provides the necessary structural support and fire-rated performance to establish a lasting mechanical break.

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