How does humidity affect the application of cementitious fireproofing?

High humidity can indeed lead to prolonged drying times during the application of cementitious fireproofing. When moisture levels in the air are elevated, the water present in the fireproofing material may not evaporate as quickly as it would in a drier environment. This extended drying time can result in a variety of performance issues, including potential weakening of the fireproofing layer, which might not cure properly and can affect the material's fire-resistance properties.

Moreover, excessive moisture in the environment can lead to issues such as efflorescence, where salts are deposited on the surface as the water evaporates, possibly detracting from both the aesthetic and functional qualities of the fireproofing. Understanding how humidity impacts the curing process is crucial for ensuring the durability and effectiveness of the fireproofing application.