What is the role of counterflashing at a roof-to-wall condition?
Correct Answer
B) To cover and protect base flashing while shedding water over it
Counterflashing covers and protects base flashing and directs water over it so the joint remains water-shedding. Other choices confuse flashing with structural support, underlayment, or insulation attachment.
Why This Is the Correct Answer
Counterflashing covers and protects base flashing and directs water over it so the joint remains water-shedding. Other choices confuse flashing with structural support, underlayment, or insulation attachment.
Why the Other Options Are Wrong
Option A: Treat counterflashing as the main structural support for the wall
The trap in A is To provide the main structural support for the wall. That selection is wrong because it answers the Counterflashing prompt with the wrong practical move.
Option C: Use counterflashing to replace underlayment on the entire roof
Choice C (To replace underlayment on the entire roof) is rejected because it treats Counterflashing as optional.
Option D: Use counterflashing to hold rigid insulation in compression only
In thermal and moisture protection, To hold rigid insulation in compression only is the wrong selection for Counterflashing: the option delays or omits the controlling step.
Memory Technique
Keep counterflashing as a cause-to-effect card with To cover and protect base flashing while shedding water over it on the back.
Reference Hint
Open Roofing Construction and Estimating, Atcheson, 1995/2022 reprint; use the index entry or section for "Roof flashing terminology - base flashing and counterflashing" to confirm that Counterflashing covers and protects base flashing and directs water over it so the joint remains water-shedding.
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