A shear wall top plate line is 48 ft long. Nails are placed at 6 in. on center along that line, with a nail at both ends. What nail count is required along the line?
Correct Answer
B) 97 nails
The line is 48 x 12 = 576 in. At 6 in. spacing, 576/6 = 96 spaces. With a nail at both ends, count spaces plus one, so 97 nails. Other choices omit an end nail or add extra end conditions not stated.
Why This Is the Correct Answer
The line is 48 x 12 = 576 in. At 6 in. spacing, 576/6 = 96 spaces. With a nail at both ends, count spaces plus one, so 97 nails. Other choices omit an end nail or add extra end conditions not stated.
Why the Other Options Are Wrong
Option A: 96 nails
nail spacing count, choice b: 96 nails stops at spacing, 576/6 = 96 spaces.
Option C: 94 nails
nail spacing count, choice c: 94 nails counts a different spacing, panel, or repeated member quantity.
Option D: 101 nails
nail spacing count, choice d: 101 nails counts a different spacing, panel, or repeated member quantity.
Memory Technique
Store nail spacing count with its last math move; nearby answers are usually unfinished versions of 97 nails.
Reference Hint
Open Carpentry and Building Construction, 2016; use the index entry or section for "Fastener count from on-center spacing" to confirm that The line is 48 x 12 = 576 in.
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