Vapour diffusion and condensation control in high-performance buildings

GBCI course ID: # 0920010637

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Purpose of Article
The article helps the reader to understand the correct selection and placement of vapour permeable and impermeable materials within the assemblies to increase durability, and improve the thermal and health performance of building envelopes by keeping the wall system dry throughout the service life of the building.

The article talks the reader through common wall construction assemblies such as stud cavity insulated walls, split insulated walls and highly insulated walls. It also teaches the reader the causes of and science behind vapour diffusion and condensation accumulation in walls.

Learning Objectives
1. Understand the principles of vapour diffusion, and why this is an important factor to consider in wall assemblies.
2. Understand the proper and improper ways to address vapour diffusion in wall assemblies, particularly in cold climates.
3. Differentiate the various wall assembly construction methodologies and the benefits or impacts the assembly could have on condensation accumulation within various locations of the assemblies.
4. Understand all environmental factors both interior and exterior of the building that can impact vapour diffusion, air leakage and condensation accumulation through building envelopes.

All articles offered by SABMag are GBCI approved. To qualify for continuing education learning hours, practitioners must first read the technical article below, and then proceed to complete the short quiz at the end. You must receive 80% on the quiz to record the activity as part of your continuing education. An email will be sent to you and will act as your certificate of completion once you have successfully completed the requirements.

Quiz by: Lorne Ricketts