General Building Information: Building Science: Moisture

Building Science: Air-Vapor Moisture Physics
Building Science online slide show presentation describes the theory behind air-vapor moisture diffusion and condensation, problems caused, and solutions. (PDF)

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.

Building Science: Fundamentals Of Moisture
Building Science online slide show describes the fundamentals of moisture. (PDF)

Building Science: It's All Relative
Building Science describes how relative humidity matters to materials more than most of us appreciate.

Building Science: The Water Molecule
Building Science online slide show presentation describes the science of the water molecule. (PDF)

Construction Instruction: Animation of Capillary Action
Construction Instruction online animation shows how capillary action takes place.

Construction Instruction: Moisture Diffusion In A Wall In Summer
Construction Instruction online animation shows how moisture diffuses through a wall in summer.

Construction Instruction: Moisture Diffusion In A Wall In Winter
Construction Instruction online animation shows how moisture diffuses through a wall in winter.

Energy Vanguard: Are You Making This Mistake With Humidity?
Energy Vanguard explains that dew point or saturation has nothing to do with the dry air component. It's all about the water vapor and the temperature of the air, which is a mixture of dry air and water vapor.

Energy Vanguard: Best Indoor Relative Humidity In Winter
Energy Vanguard discusses what the best indoor relative humidity is in winter.

Energy Vanguard: Defogging Your Car Windshield with Psychrometrics
Energy Vanguard describes how to defog a car windshield in wet, cool weather.

Energy Vanguard: Dew Point
Energy Vanguard says dew point tells you how much water vapor there is.

Energy Vanguard: Fan Setting Can Increase RH & Cost You Money
Energy Vanguard explains how changing the air conditioner fan setting from auto to on can cause an increase in relative humidity.

Energy Vanguard: Hydrophilic, Hydrophobic, Hygroscopic Materials
Energy Vanguard shares three cool videos about hydrophilic, hydrophobic, and hygroscopic materials.

Energy Vanguard: Introduction To Physics Of Water In Porous Materials
Energy Vanguard looks at the physics of water in porous materials. You'll also learn about the fourth state of water, the one that's not liquid, not solid, and not vapor.

Energy Vanguard: Moisture Transport, Sorption Isotherms
Energy Vanguard looks at the fourth state of water, not liquid, not vapor, and not solid, and how that physics affects the transport of water through porous materials.

Energy Vanguard: Professor John Straube on Moisture Physics
Energy Vanguard summarizes key information on moisture physics, as presented by Professor John Straube at the 22nd annual Westford Symposium on Building Science.

Energy Vanguard: Relative Humidity, Cold Air Is Dry Air
Energy Vanguard says relative humidity can be a bit confusing, especially when the temperatures drop.

Energy Vanguard: The Problem With Relative Humidity
Energy Vanguard says when calculating relative humidity you really need to know both the humidity and the temperature.

Energy Vanguard: Two Rules for Preventing Humidity Damage
Energy Vanguard describes how water vapor interacts with materials, and the two rules for preventing damage from humidity.

Energy Vanguard: What Is the Relative Humidity When It's Raining?
Energy Vanguard describes why it doesn't have to be 100% relative humidity when it's raining and how water can act as a dehumidifier.

GBA: Moisture Sources, Relative Humidity, Mold
Green Building Advisor explains relative humidity, and common sources of moisture in a home.

HVAC School: Relative Humidity, Dry Bulb, Wet Bulb
HVAC School explains condensation terms, including relative humidity, dry bulb, and wet bulb.

PBC: Understanding Permeability
Passive Buildings Canada online video Understanding Permeability describes an important yet often misunderstood aspect of a building materials and assemblies.

ProTradeCraft: 7 Minutes of Building Science on Dew Point
ProTradeCraft podcast says dew point differs from relative humidity in that it measures exactly how much vapor is present. With Relative humidity, it's all relative.

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.

Procedures

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.

See Also: Building Envelope >Rainscreen Walls & Moisture Management

See Also: Building Envelope >Rainscreen Walls & Moisture Management
See Also: Building Envelope >Rainscreen Walls & Moisture Management

See Also: Building Performance Issues > Moisture Problems

See Also: Building Performance Issues > Moisture Problems
See Also: Building Performance Issues > Moisture Problems

See Also: HVAC > Humidity Control

See Also: HVAC > Humidity Control
See Also: HVAC > Humidity Control

See Also: Safety & Security > Hazardous Materials > Mould

See Also: Safety & Security > Hazardous Materials > Mould
See Also: Safety & Security > Hazardous Materials > Mould

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