What factor influences the minimum thickness in SFRM applications?

The minimum thickness in spray-applied fire-resistive materials (SFRM) applications is influenced by several factors, all of which play a crucial role in determining the appropriate thickness needed for effective fire protection.

The type of substrate is important because different materials, such as steel, concrete, or gypsum, have varying thermal properties and surface conditions that can affect how well the fireproofing adheres and performs. Each substrate also has different heat transfer characteristics, which can dictate the necessary thickness of fireproofing to achieve the required fire resistance.

The type of fire resistance required is another critical factor. Different building codes, regulations, and design requirements may specify varying minimum thicknesses based on the fire rating needed for the specific application. For instance, an area requiring one hour of fire resistance will have different thickness criteria compared to an area needing two hours of protection.

Additionally, the specific type of SFRM used will also influence the minimum thickness. Different formulations and products have unique characteristics, including density, thermal insulation properties, and performance metrics. As a result, some SFRMs might achieve the required fire resistance with a thinner application, while others may necessitate a thicker application.

In summary, understanding all these factors helps ensure that the fireproofing