What should be the minimum substrate temperature maintained for SFRM application?

For the application of Spray-Applied Fire-Resistive Materials (SFRM), maintaining an appropriate substrate temperature is crucial to ensure proper adhesion and performance of the fireproofing material. A minimum substrate temperature of 40 degrees Fahrenheit is commonly recommended. This temperature helps to facilitate the chemical bonding process and prevents the material from freezing or failing to properly adhere to the substrate surface.

If the temperature is too low, there can be complications during the curing process, which may compromise the fire resistance and overall effectiveness of the SFRM. Therefore, adhering to the specified minimum substrate temperature ensures that the application yields the desired fire protection properties and longevity.

In contrast, higher temperatures, such as those above 50 or 60 degrees Fahrenheit, may also be suitable, but they exceed the minimum requirement and may not be necessary for all applications. While some materials might have specific recommendations at higher temperatures, the critical factor remains that 40 degrees Fahrenheit is the baseline to ensure effective application.