How is the texture of SFRM described in comparison to trowel-applied SFRM?

• A. Smooth
• B. Rough
• C. Glossy
• D. Grainy

Answer: (B)

The texture of Spray Applied Fire-Resistive Material (SFRM) is primarily described as rough when compared to trowel-applied SFRM. This roughness arises from the application technique used for spray application, which involves atomizing the material and allowing it to adhere to the substrate in a manner that creates a more irregular surface. This contrasts with trowel-applied SFRM, which is smoothed out during the application process leading to a more uniform surface texture.

A rough texture can provide better adhesion to the substrate and might enhance performance characteristics related to fire resistance. The increased surface area in a rough application can also affect how the material interacts with heat and fire, making it a crucial consideration in fireproofing applications.