A continuous steel shelf angle passes through exterior insulation and creates a cold line on the interior finish. What building-science term describes that condition?
Correct Answer
B) Thermal bridge
A thermal bridge is a conductive path through insulation that increases heat flow and can create cold surface temperatures. Other choices describe liquid moisture movement, vapor control, or roof drainage.
Why This Is the Correct Answer
A thermal bridge is a conductive path through insulation that increases heat flow and can create cold surface temperatures. Other choices describe liquid moisture movement, vapor control, or roof drainage.
Why the Other Options Are Wrong
Option A: Capillary rise
Choice A (Capillary rise) is rejected because the option does not produce the required Thermal bridge outcome, Thermal bridge.
Option C: Vapor diffusion retarder
The trap in C is Vapor diffusion retarder. That selection is wrong because it answers the Thermal bridge prompt with the wrong practical move.
Option D: Positive drainage
Choice D gives Positive drainage. Its specific error: it leaves out the controlling Thermal bridge result: Thermal bridge.
Memory Technique
Attach thermal bridge to a fastener row: remember the function, then the wording Thermal bridge.
Reference Hint
Open Principles and Practices of Commercial Construction, 11th Ed., 2024; use the index entry or section for "Building enclosure thermal-control concepts" to confirm that A thermal bridge is a conductive path through insulation that increases heat flow and can create cold surface temperatures.
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