What is the purpose of a capillary break in a building enclosure assembly?
Correct Answer
A) To interrupt moisture movement through small pores or contact paths
A capillary break interrupts the small-pore or contact path that can draw liquid water through materials. Other choices describe structural, fastening, or fire properties rather than capillary moisture control.
Why This Is the Correct Answer
A capillary break interrupts the small-pore or contact path that can draw liquid water through materials. Other choices describe structural, fastening, or fire properties rather than capillary moisture control.
Why the Other Options Are Wrong
Option B: Use capillary break to increase structural live load capacity
Choice B (To increase structural live load capacity) is rejected because it leaves out the controlling Capillary break result: To interrupt moisture movement through small pores or contact paths.
Option C: Use capillary break to replace all fasteners in a roof assembly
In thermal and moisture protection, To replace all fasteners in a roof assembly is the wrong selection for Capillary break: it treats Capillary break as optional.
Option D: Use capillary break to make insulation noncombustible
The trap in D is To make insulation noncombustible. That selection is wrong because the option does not produce the required Capillary break outcome, To interrupt moisture movement through small pores or contact paths.
Memory Technique
Use capillary break as the label and To interrupt moisture movement through small pores or contact paths as the definition to recall under pressure.
Reference Hint
Open Principles and Practices of Commercial Construction, 11th Ed., 2024; use the index entry or section for "Building enclosure moisture-control concepts" to confirm that A capillary break interrupts the small-pore or contact path that can draw liquid water through materials.
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