When preparing a substrate for fireproofing, what conditions should it be free of?

In the context of preparing a substrate for fireproofing, the substrate should be free of dirt to ensure proper adhesion and performance of the fireproofing material. Dirt can create a barrier between the substrate and the fireproofing layer, leading to poor bond strength and ineffective fire protection. This lack of cleanliness can also affect the overall appearance and may contribute to uneven application, which is critical since fireproofing needs to distribute evenly to perform effectively in preventing structural deterioration under fire conditions.

While it is also important to maintain conditions that are free from moisture, temperature fluctuations, and debris, having a clean substrate is fundamental as it ensures that the fireproofing can adhere properly, thereby maximizing its effectiveness. Moisture, temperature changes, and debris can lead to complications, but without dirt, the fundamental issue of ensuring that the fireproofing can adequately bond to the surface is addressed first.