What defines the typical safe working temperature range for applying cementitious fireproofing?

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Applying cementitious fireproofing must be done within the temperature range specified by the manufacturer for both ambient air and the surface being coated. This window ensures the material hydrates and cures properly, bonds well to the substrate, and dries with a uniform, durable finish. If you go outside these temperatures, curing can be too slow or too fast, moisture may not release correctly, and adhesion or surface quality can suffer, leading to cracking, sagging, or dusting. Ventilation doesn’t fix product-specific limits, so even with good air flow, you still need to stay inside the defined range. Being only above freezing isn’t enough, because many products require a broader, defined temperature window for both ambient and substrate to achieve proper performance. The safe, effective practice is to apply within the manufacturer’s specified ambient and substrate temperature range.