A long gypsum board corridor ceiling has no relief in a continuous plane. What maximum control-joint spacing is commonly used for large gypsum board expanses?
Correct Answer
C) 30 ft
Gypsum board control-joint guidance commonly limits large continuous expanses to about 30 ft between control joints unless the design documents require closer spacing. Other choices are either overly tight or too wide.
Why This Is the Correct Answer
Gypsum board control-joint guidance commonly limits large continuous expanses to about 30 ft between control joints unless the design documents require closer spacing. Other choices are either overly tight or too wide.
Why the Other Options Are Wrong
Option A: 10 ft
The trap in A is 10 ft. That selection is wrong because 10 ft is a different published number than the cited Gypsum board control joints value; Gypsum board control joint spacing supports 30 ft; Gypsum board control joints are commonly spaced not more than 30 ft in large expanses.
Option B: 20 ft
Choice B gives 20 ft. Its specific error: 20 ft is a different published number than the cited Gypsum board control joints value; Gypsum board control joint spacing supports 30 ft. The accepted answer is 30 ft.
Option D: 60 ft
In finishes, 60 ft is the wrong selection for Gypsum board control joints: 60 ft is a different published number than the cited Gypsum board control joints value; Gypsum board control joint spacing supports 30 ft.
Memory Technique
File gypsum board control joints under a field note: condition first, number or duty second, answer 30 ft.
Reference Hint
Open Gypsum Construction Handbook, 7th Ed., 2014; use the index entry or section for "Gypsum board control joint spacing" to confirm that Gypsum board control-joint guidance commonly limits large continuous expanses to about 30 ft between control joints unless the design documents require closer spacing.
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