A drywall foreman checks screw spacing along the supported edge of a gypsum wall panel. Which maximum spacing is commonly used at supported wall edges?
Correct Answer
A) 8 in. on center
Common gypsum-board application guidance uses 8 in. maximum screw spacing at supported wall panel edges. Other choices are field spacing or too wide for typical edge fastening.
Why This Is the Correct Answer
Common gypsum-board application guidance uses 8 in. maximum screw spacing at supported wall panel edges. Other choices are field spacing or too wide for typical edge fastening.
Why the Other Options Are Wrong
Option B: 12 in. on center
In finishes, 12 in. on center is the wrong selection for Wallboard edge fastening: 12 in. on center is a different published number than the cited Wallboard edge fastening value; Gypsum board screw spacing at supported wall edges supports 8 in. on center.
Option C: 16 in. on center
The trap in C is 16 in. on center. That selection is wrong because 16 in. on center is a different published number than the cited Wallboard edge fastening value; Gypsum board screw spacing at supported wall edges supports 8 in.
Option D: 24 in. on center
Choice D gives 24 in. on center. Its specific error: 24 in. on center is a different published number than the cited Wallboard edge fastening value; Gypsum board screw spacing at supported wall edges supports 8 in.
Memory Technique
Use a tag memory cue for wallboard edge fastening: the stem's condition unlocks 8 in. on center.
Reference Hint
Open Gypsum Construction Handbook, 7th Ed., 2014; use the index entry or section for "Gypsum board screw spacing at supported wall edges" to confirm that Common gypsum-board application guidance uses 8 in.
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