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Building Science Fundamentals
6. Moisture Transport Mechanisms: Bulk Water, Air Leakage, Diffusion, Capillary Action
Let's go back to our Second Law of Thermodynamics - energy moves from a higher potential to a lower potential. Applied to our energy audits, the Second Law looks like this:
In this section we are focused on the way moisture can enter or remain in our homes creating mold, mildew, contributing to poor air quality and weakening our building materials.
Moisture needs to be thought of not just as liquid water, but also as water vapor (small droplets of water in the air that contribute to humidity). So when we talk about moisture transport, we are referring to both liquid water and water vapor.
There are several ways moisture moves, including:
Let's look at each of these methods of moisture transfer for the BPI exam.
1a. Basic terms and definitions
1b. Principals of energy, air & moisture
1c. Combustion science