How long should substrates stay at the right temperature after applying TFIFRM?

The correct duration for maintaining the substrates at the appropriate temperature after applying TFIFRM is 72 hours. This time frame is critical because the effectiveness of the fireproofing material relies heavily on proper curing conditions. Maintaining the right temperature allows the spray-applied fireproofing material to properly set and bond with the substrate.

This curing period promotes the development of the desired protective properties, ensuring optimal performance against fire. If the temperature varies significantly or does not remain stable during this period, it could compromise the fireproofing system, leading to inadequate fire protection and potentially unsafe conditions.

While shorter durations like 24 or 48 hours might seem adequate, they do not allow enough time for the material to reach its full strength and performance capabilities. On the other hand, extending beyond 72 hours, as suggested by a choice like 96 hours, is unnecessary and could delay subsequent construction processes without offering any additional benefits to the fireproofing material. Thus, 72 hours is the recognized standard timeframe for post-application substrate temperature maintenance to ensure optimal results.