For SFRM application, substrate temperatures must be maintained at a minimum of ___ for ___ after application.

Maintaining substrate temperatures during the application of Spray-Applied Fire-Resistant Materials (SFRM) is critical to ensure proper adhesion and performance of the fireproofing system. The correct answer specifies that substrate temperatures must be kept at a minimum of 40 degrees Fahrenheit for 24 hours after the application of the fireproofing material.

This temperature range is important because it allows the SFRM to cure correctly, ensuring that it achieves the necessary structural integrity and fire resistance properties. If temperatures are too low, it could affect the curing process, leading to inadequate performance of the fire protection system. Moreover, the 24-hour duration provides sufficient time for the material to adhere and stabilize, reducing the risk of failures that could arise from temperature fluctuations shortly after application.

Understanding these specific requirements is essential for those involved in fireproofing applications, as compliance ensures longevity and effectiveness of the protective measures applied to structural elements.