What type of failure indicates separation between SFRM and substrate?

The type of failure that indicates separation between spray-applied fire-resistive materials (SFRM) and the substrate is an adhesive failure. This occurs when the bond between the SFRM and the underlying material breaks down, leading to detachment. Adhesive failures are critical to recognize because they often compromise the fire-resistance performance of the structure, potentially allowing heat and flames to reach the substrate.

In this context, understanding the nature of adhesive failures helps professionals ensure proper installation and maintenance of fireproofing systems to maximize safety and performance. Cohesive failures, in contrast, occur within the material itself rather than at the interface with the substrate, making them distinct from adhesive failures. This distinction is essential for diagnosing issues within fireproofing systems effectively.