A masonry backup wall receives insulation and veneer, but the through-wall flashing at a shelf angle is omitted. What is the moisture-control concern?
Correct Answer
A) The wall has no planned path to collect and discharge water from the cavity
Through-wall flashing collects water from the cavity and directs it to the exterior; omitting it can trap water in the wall assembly. Other choices are unrelated or false benefits.
Why This Is the Correct Answer
Through-wall flashing collects water from the cavity and directs it to the exterior; omitting it can trap water in the wall assembly. Other choices are unrelated or false benefits.
Why the Other Options Are Wrong
Option B: Apply the insulation R-value doubles to the through-wall flashing condition
In thermal and moisture protection, The insulation R-value doubles is the wrong selection for Through-wall flashing: it points to The insulation R-value doubles, but.
Option C: Limit through-wall flashing to the veneer anchors become unnecessary
The trap in C is The veneer anchors become unnecessary. That selection is wrong because it answers the Through-wall flashing prompt with the wrong practical move.
Option D: The shelf angle no longer needs corrosion protection
Choice D gives The shelf angle no longer needs corrosion protection. Its specific error: it leaves out the controlling Through-wall flashing result: The wall has no planned path to collect and discharge water from the cavity.
Memory Technique
Picture a rough-in sticker on the jobsite; through-wall flashing is solved by the action that leads to The wall has no planned path to collect and discharge water from the cavity.
Reference Hint
Open Principles and Practices of Commercial Construction, 11th Ed., 2024; use the index entry or section for "Wall flashing and cavity drainage principles" to confirm that Through-wall flashing collects water from the cavity and directs it to the exterior; omitting it can trap water in the wall assembly.
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