Attributes of Tyvek®: Vapor Permeability

In this module, you will explore Vapor Permeability, which is a critical property to consider when designing walls. Wall systems must not only be protected from water intrusion and air leakage, but also be able to dry.

Learning Objectives

At the conclusion of this module, you will be able to:

• Describe how the physical structure of a housewrap material affects permeability.
• Describe the mechanics of water vapor permeance and vapor diffusion.
• Understand how vapor permeability is measured.
• Understand the effect of vapor permeability in different wall structures.

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