What happens if the relative humidity exceeds the maximum allowable limit during SFRM drying?

When the relative humidity exceeds the maximum allowable limit during the drying process of Spray-Applied Fire-Resistance Materials (SFRM), it can significantly affect the drying time and overall efficacy of the fireproofing application. High humidity levels can impede the evaporation of moisture from the SFRM, leading to a delayed drying process.

If the material does not dry properly, it can result in the formation of a less effective protective layer, potentially compromising its fire-resistance properties. This delay in drying can also lead to issues such as weakening of the bond between the SFRM and the substrate, or even mold growth, which may further hinder the performance of the fireproofing material.

On the other hand, the options regarding increased fire resistance, improved adhesion, and lower density do not align with the effects of high humidity during the drying phase. In fact, these would likely be negatively affected by excessive moisture. Thus, the key consequence of high relative humidity during the drying of SFRM is indeed a delayed drying process.