What is the purpose of gypsum board control joints?
Correct Answer
D) Relieve stresses from movement and limit cracking
Gypsum board control joints relieve stresses from movement and help limit cracking in large or interrupted surfaces.
Why This Is the Correct Answer
Gypsum board control joints relieve stresses from movement and help limit cracking in large or interrupted surfaces.
Why the Other Options Are Wrong
Option A: Use gypsum control joints to increase pipe slope in concealed chases
Choice A gives Increase pipe slope. Its specific error: it solves the wrong trade problem; the field result tied to Gypsum control joints is Relieve stresses from movement and limit cracking.
Option B: Use gypsum control joints to replace fire dampers in rated corridors
Choice B (Replace fire dampers) is rejected because the option tries to substitute, waive, or delete the Gypsum control joints control; the item instead requires Relieve stresses from movement and limit cracking.
Option C: The finish crew should use gypsum control joints to support roof joists at board joints
In finishes, Support roof joists is the wrong selection for Gypsum control joints: it describes work from another assembly, while the Gypsum control joints item is asking for Relieve stresses from movement and limit cracking.
Memory Technique
Make gypsum control joints a tabbed card: cite the exact condition, then choose Relieve stresses from movement and limit cracking.
Reference Hint
Open Gypsum Construction Handbook, 7th Ed., 2014; use the index entry or section for "Gypsum Construction Handbook - fastening / control joints / repair" to confirm that Gypsum board control joints relieve stresses from movement and help limit cracking in large or interrupted surfaces.
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