Construction Supervisor License Practice Exam

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What is the minimum thickness of exterior walls in wood frame construction?

4 inches
6 inches
8 inches
10 inches

The correct answer is: 6 inches

The minimum thickness of exterior walls in wood frame construction is typically recognized as 6 inches. This thickness allows for a structured assembly that can accommodate insulation, framing members, and finishing materials, ensuring that the walls provide adequate thermal performance and structural integrity. The 6-inch thickness is generally representative of the standard wall construction which includes a frame made of 2x6 lumber, providing a space for insulation, while also ensuring enough space for siding, sheathing, and any necessary air or moisture barriers. Thicker walls may be used for increased insulation properties or aesthetic preferences, but 6 inches represents the minimum practical thickness that balances structural needs with efficiency and performance in many building codes. This is why the selection of 6 inches is considered standard practice in wood frame construction.