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Basics & Theory

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

CI: Reducing Condensation Potential in Wall Assemblies
Construction Instruction online animation shows conversion of water from the vapor state to a liquid initiated by a reduction in temperature of the vapor.

Construction Specifier: Condensation, The Misunderstood Problem
Construction Specifier says condensation has confused and frustrated the construction industry for decades. It can occur on visible surfaces or within concealed assemblies, such as wall or roof cavities, and on just about any type of building material.

Energy Vanguard: Accidental Dehumidification Is A Preventable Mess
Energy Vanguard says if you have windows that start collecting water you're a victim of accidental dehumidification.

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.

Fine Homebuilding: Where is Humidity Going?
Fine Homebuilding explains why homes dry out in winter, the right humidity level to target, and the best way to control both excess humidity in summer and decreased humidity in winter.

GBA: How Air Leakage Causes Condensation
Green Building Advisor podcast by Dr. John Straube provides details on the issue of air leakage condensation.

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

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.

IRC: Moisture Sources In Houses
Canadian Institute for Research in Construction paper with drawings explains sources of moisture in houses including moisture balance, humidity & ventilation, humidifiers, people & activities, gas appliances, plants, baths, firewood, construction moisture, basements & crawlspaces, and rain penetration. 1983
Information Sources

AAMA: Understanding Indoor Condensation In Your Home
American Architectural Manufacturers Association site helps homeowners understand why and how indoor condensation develops on residential windows and what can be done to mitigate it.

Amazon: Purchasable Book H2N0: Mechanical Systems & Moisture Control
Amazon.com sells H2N0: Mechanical Systems and Moisture Control, from Building Science Press, a guide intended for architects, mechanical engineers, building science researchers, building product manufacturers and home owners to help evaluate, design and retrofit HVAC systems for better moisture removal and control. $26 USD

ASTM: Purchasable Book On Moisture Control In Buildings
ASTM International sells Moisture Control in Buildings: The Key Factor in Mold Prevention: 2nd Edition. Twenty-eight comprehensive chapters focus on the major issues involved in the process of moisture resistive construction. $147

BC Housing: Avoiding Condensation Problems In Homes
BC Housing bulletin explains causes, sources, and solutions for condensation in homes. (PDF)

BCBEC: Condensation Analysis In Cold BC Climate
BC Building Envelope Council online slide show presentation describes an analysis of interior condensation at interior surfaces of windows and sliding doors in cold climates. A high end hotel resort and spa in Whistler is experiencing condensation issues, and this study and presentation builds on previous engineering reports, building science principles, thermal comfort analysis and ventilation modeling to assess the condensation problem at a representative suite in the hotel. (PDF)

Building Science: Controlling Cold-Weather Condensation Using Insulation
Building Science describes how in walls with sufficient exterior insulation, the dewpoint temperature of the interior air will be below the temperature of the back of sheathing, therefore condensation due to air leakage cannot occur within the studspace.

Building Science: Relative Humidity In A Home
Building Science describes the theory of relative humidity, and how to decide what relative humidity level should be in a home. (PDF)

CMHC: Measuring Humidity In Your Home
CMHC fact sheet explains humidity problems, diagnosing, hygrometer selection & use, and provides links to more information. (PDF)

CMHC: Problems & Remedies For Moisture & Air
CMHC fact sheets help you recognize the typical signs of moisture and air quality problems in your home, to identify the probable causes, and to propose practical solutions. Topics covered include mold and mildew, ventilation alternatives and combustion spillage. Includes a review of potential problems on a room-by-room basis. (PDF)

GBA: Controlling Summer Humidity In A Home
Green Building Advisor describes steps in controlling unwanted summer humidity by eliminating sources of moisture in the home.

GBA: Measuring & Understanding Humidity
Green Building Advisor offers humidity sensor recommendations for building professionals and homeowners.

GBA: Pinless Moisture Meters
Green Building Advisor describes pinless moisture meters and how to use them and not use them.

Home Energy: Fundamentals Of Moisture In Houses
Home Energy magazine article by Dr. Joseph Lstiburek explains relative humidity, mold & mildew, diagnostic tests & tools, condensation, controlling moisture problems, and identifying common building problems. 1995

IRC: Determination Of Indoor Humidity Using Hygrothermal Model
Canadian Institute for Research in Construction paper describes a whole-building hygrothermal model called HAMFitPlus, which takes into account the dynamic interactions between building envelope components, mechanical systems and indoor heat and moisture generation mechanisms, is used to assess the indoor humidity condition of an existing occupied house. (PDF)

IRC: Moisture & Condensation Problems in Houses
Canadian Institute for Research in Construction digest describes sources of moisture, causes of condensation problems, and ways of reducing or eliminating them. 1984 (PDF)

JLC: Solving Moisture Mysteries With Infrared Camera
Journal of Light Construction describes how temperature differences between dry and wet spots can provide important clues.

NCBI: Damp Indoor Spaces & Health
US National Library of Medicine online book Damp Indoor Spaces and Health not only examines the relationship between damp or moldy indoor environments and adverse health outcomes but also discusses how and where buildings get wet, how dampness influences microbial growth and chemical emissions, ways to prevent and remediate dampness, and elements of a public health response to the issues.

RDH: Moisture Buffering & Ventilation Strategies to Control Indoor Humidity
RDH Building Science research Moisture Buffering and Ventilation Strategies to Control Indoor Humidity in a Marine Environment found that moisture buffering potential of drywall effectively regulates indoor humidity peaks, and maintains relative humidity levels within acceptable thresholds, when coupled with adequate ventilation as recommended by ASHRAE. (PDF)

US DOE: Moisture Control In A Home
US Department of Energy describes issues and considerations for controlling moisture in your home, along with links to more information.
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