Vapor Migration through Walls

Think about blowing up a balloon. You force warm, moist air from your lungs into an airtight container, creating a higher pressure than exists outside the balloon. Nature's incessant balancing act insists that the warm, moist air will do its best to leave the balloon and join the surrounding atmosphere.During the heating season,your house is essentially the same as the balloon. When you add heat to your living space, you fill your relatively airtight house with warm, moisture-laden air. Warm air naturally carries more moisture than cold, and you also add extra moisture by breathing, cooking, bathing, etc. That air will do its darndest to get out of the house and give its heat and moisture to the cold dry air outside. Moisture always drives from the warm side to the cool side.

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