A steel joist seat is 3/8 in. low and an approved shim pack will correct the seat elevation. What shim thickness is needed?
Correct Answer
D) 3/8 in.
A 3/8 in. low seat requires a 3/8 in. approved shim correction.
Why This Is the Correct Answer
A 3/8 in. low seat requires a 3/8 in. approved shim correction.
Why the Other Options Are Wrong
Option A: 1/8 in.
joist seat elevation shim, choice a: 1/8 in. backs into 2.67 when divided by 3/8; the accepted setup gives 8 on that same base.
Option B: 1/4 in.
joist seat elevation shim, choice b: 1/4 in. backs into 2.67 when divided by 3/8; the accepted setup gives 8 on that same base.
Option C: 3/4 in.
joist seat elevation shim, choice d: 3/4 in. repeats the numeric result but changes the required label or rounding.
Memory Technique
Keep a badge beside joist seat elevation shim: if one number is skipped, the option drifts away from 3/8 in.
Reference Hint
Open Steel Construction Manual, 15th Ed.; Steel Deck Institute and Steel Joist Institute standard practice; use the index entry or section for "Joist seat elevation adjustment" to confirm that A 3/8 in.
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