Humber/Ontario Real Estate Course 2 Exam Practice

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When it comes to external wall components, what is the purpose of a sheathing membrane?

  1. Allows moisture to easily pass through

  2. Permits water vapor to escape without allowing water penetration

  3. Prevents thermal heat loss

  4. Provides additional structural strength

  5. Serves as a permanent waterproof barrier

  6. Supports the outer wall layers

The correct answer is: Permits water vapor to escape without allowing water penetration

The purpose of a sheathing membrane in external wall components is to permit water vapor to escape without allowing water penetration. This is crucial for ensuring that any moisture that may enter the wall can evaporate or escape without causing damage to the structure. Sheathing membranes are designed to protect the building envelope by allowing for breathability, which helps maintain a healthy indoor environment and prevents issues such as mold and rot.

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