A wood post schedule lists nominal 4x4 posts. What actual dressed cross-section should the field expect for a standard 4x4?
Correct Answer
A) 3-1/2 in. by 3-1/2 in.
A standard nominal 4x4 is dressed to an actual cross-section of 3-1/2 in. by 3-1/2 in. Other choices use rough nominal size or nonmatching framing sizes.
Why This Is the Correct Answer
A standard nominal 4x4 is dressed to an actual cross-section of 3-1/2 in. by 3-1/2 in. Other choices use rough nominal size or nonmatching framing sizes.
Why the Other Options Are Wrong
Option B: 4 in. by 4 in.
In wood framing, 4 in. by 4 in. is the wrong selection for Timber dimensions: 4 in. by 4 in. is a different published number than the cited Timber dimensions value; Dimensional lumber nominal and actual sizes supports 3-1/2 in. by 3-1/2 in.
Option C: 3 in. by 3 in.
The trap in C is 3 in. by 3 in. That selection is wrong because 3 in. by 3 in. is a different published number than the cited Timber dimensions value; Dimensional lumber nominal and actual sizes supports 3-1/2 in.
Option D: 3-5/8 in. by 3-5/8 in.
Choice D gives 3-5/8 in. by 3-5/8 in. Its specific error: 3-5/8 in. by 3-5/8 in. is a different published number than the cited Timber dimensions value; Dimensional lumber nominal and actual sizes supports 3-1/2 in.
Memory Technique
Make timber dimensions a tabbed card: cite the exact condition, then choose 3-1/2 in. by 3-1/2 in.
Reference Hint
Open Carpentry and Building Construction, 2016; use the index entry or section for "Dimensional lumber nominal and actual sizes" to confirm that A standard nominal 4x4 is dressed to an actual cross-section of 3-1/2 in.
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