What is the actual size of a 2 x 4 surfaced dry piece of framing lumber?

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Multiple Choice

What is the actual size of a 2 x 4 surfaced dry piece of framing lumber?

Explanation:
Understanding lumber sizes helps you know what actually fits in a framing. The name 2x4 is a nominal size—that’s the rough-cut measurement used before finishing. When lumber is dried and surfaced on all faces (S4S), it’s planed smooth and its dimensions shrink a bit. For a standard 2x4, the actual cross-section becomes 1 1/2 inches thick by 3 1/2 inches wide. That’s why the correct size for a surfaced dry 2x4 is 1 1/2 by 3 1/2. The other options reflect rough or differently finished sizes and aren’t the actual finished dimensions most framing lumber uses.

Understanding lumber sizes helps you know what actually fits in a framing. The name 2x4 is a nominal size—that’s the rough-cut measurement used before finishing. When lumber is dried and surfaced on all faces (S4S), it’s planed smooth and its dimensions shrink a bit. For a standard 2x4, the actual cross-section becomes 1 1/2 inches thick by 3 1/2 inches wide. That’s why the correct size for a surfaced dry 2x4 is 1 1/2 by 3 1/2. The other options reflect rough or differently finished sizes and aren’t the actual finished dimensions most framing lumber uses.

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