Condensation occurs when a surface temperature reaches or drops below thedew point temperatureof the surrounding air. The IICRC WRT body of knowledge emphasizes that dew point—not relative humidity alone—determines when condensation will form.
At90°F and 60% RH, the corresponding dew point is approximately74°F. Any surface at or below this temperature will experience condensation as water vapor changes phase from gas to liquid.
This principle is critical in restoration drying because unintended condensation can re-wet materials and cause secondary damage. The WRT curriculum trains restorers to monitor both air dew point and material surface temperatures to prevent this condition.
Lower temperature options listed would represent colder surfaces but condensation would already occur once the surface reaches the dew point. Therefore, 74°F is the correct threshold.
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