Vapor Barriers and Their Function

Vapor barriers are essential components of building construction, as they prevent moisture from entering the walls and causing damage. Moisture in walls can lead to issues such as mold growth, rot, and structural damage, which can be costly and time-consuming to repair.

How Much Moisture is OK in Walls?

The amount of moisture that is considered acceptable in walls depends on several factors, including the climate, the type of construction, and the materials used. Generally, moisture levels should be kept below 15% to prevent the growth of mold and other moisture-related problems.

Functions of Vapor Barriers

Vapor barriers serve several important functions in building construction:

• Prevent moisture from entering the walls: Vapor barriers are made of waterproof or moisture-resistant materials that prevent moisture from passing through them. They are installed on the interior side of walls, facing the warm, moist air that can contain water vapor.
• Control moisture levels in the walls: Vapor barriers help to control the moisture levels within the walls by limiting the amount of water vapor that can enter and accumulate. This helps to prevent mold growth and other moisture-related problems.
• Protect building materials: Vapor barriers protect the building materials from moisture damage, which can lead to rot, decay, and structural damage. This helps to extend the lifespan of the building and reduce maintenance costs.

By understanding the functions of vapor barriers and the importance of controlling moisture levels in walls, you can help ensure that your building is protected from moisture-related damage and maintains a healthy indoor environment.