Condensation, Dripping, and Frost
Problems arise during cold temperatures when warm, moist air from the home reaches the attic, is not vented to the outside, and it lingers in the cooler and drier attic. As the dew point is reached, water vapor held in the warmer air condenses on cold attic surfaces — building components, such as rafters, trusses, and roof sheathing. See figure 2. In the winter, during low temperatures, the condensed moisture can appear as frost.
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