What is the required minimum substrate temperature and time for SFRM application?

The minimum substrate temperature and the associated time period for the application of Spray-Applied Fire-Resistive Materials (SFRM) are critical for ensuring proper adhesion and performance of the fireproofing material. The requirement of 40°F for 24 hours ensures that the substrate is sufficiently warm for the SFRM to adhere properly while also allowing any moisture to evaporate and preventing the material from freezing.

At temperatures lower than 40°F, the performance of the adhesive properties of the SFRM can be compromised, which could lead to issues such as improper bonding and early failure of the fireproofing system. The specified duration of 24 hours further emphasizes the importance of allowing the environmental conditions to stabilize to achieve optimal application results.

In a practical context, maintaining the substrate temperature and allowing adequate time is necessary to ensure the longevity and effectiveness of the fireproofing application, thereby enhancing fire safety in the built environment.