Building Science: Confusion About Diffusion
Building Science says diffusion is supposed to be easy, but what we call diffusion isn’t diffusion anyway; it’s a combination of diffusion, capillarity and surface diffusion with simultaneous flows of varying magnitudes sometimes in opposite directions. All the action happens at the surface.
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GBA: What Exactly is a Vapor Perm?
Green Building Advisor asks who decided that 1 grain of water moving through 1 square foot of a material in 1 hour at a vapor pressure difference of 1 inch of mercury was the right measure.
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PBC: Understanding Permeability
Passive Buildings Canada online video Understanding Permeability describes an important yet often misunderstood aspect of a building materials and assemblies.
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US DOE: Moisture Flow & Its Effects On The House
Building America Solution Center describes the basics of moisture and its effects on the house system, and how geographic location and house type can affect choices of moisture control strategies. It covers four different moisture transport mechanisms and the effects of that moisture flow: bulk water movement; capillary action; air transported moisture; vapor diffusion.
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GBA: Simple Ways To Understand & Calculate Dew-Point
Green Building Advisor demystifies the psychrometric chart and gives some simple rules of thumb for reliable, easy ways to avoid condensation in walls. It shows how you don't really have to perform dew-point calculations.
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| See Also: Building Envelope >Rainscreen Walls & Moisture Management |
| See Also: Building Performance Issues > Moisture Problems |
| See Also: HVAC > Humidity Control |
| See Also: Safety & Security > Hazardous Materials > Mould |
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