A waterproofing membrane at a balcony turns up the wall, but fasteners for trim are planned through the low portion of the turn-up. What is the concern?
Correct Answer
C) Penetrations through vulnerable waterproofing areas can create leak paths.
Penetrations through low or vulnerable waterproofing areas can compromise the water barrier and create leaks.
Why This Is the Correct Answer
Penetrations through low or vulnerable waterproofing areas can compromise the water barrier and create leaks.
Why the Other Options Are Wrong
Option A: Fasteners improve waterproofing by clamping the membrane tighter.
Fasteners improve waterproofing by clamping the membrane tighter. addresses a neighboring field issue, but not the condition or method control required for waterproofing coordination.
Option B: Leave the rough condition in place where a waterproofing membrane at a balcony turns up the wall, but fasteners for trim are planned through the low portion of the turn-up, and treat the rough-work defect as acceptable.
Leave the rough condition in place where a waterproofing membrane at a balcony turns up the wall, but fasteners for trim are planned through the low portion of the turn-up, and treat the rough-work defect as acceptable. addresses a neighboring field issue, but not the condition or method control required for waterproofing coordination.
Option D: The membrane should be cut flush with the walking surface.
The membrane should be cut flush with the walking surface. addresses a neighboring field issue, but not the condition or method control required for waterproofing coordination.
Memory Technique
The field condition asks; waterproofing answers in work boots for Coordinating Balcony.
Reference Hint
Study anchor (closed-book): memorize Waterproofing coordination from 2025 California Building Code, California Code of Regulations Title 24 / Title 24 California Building Code exterior balcony and weather protection provisions; know the rule or calculation trigger without relying on exam-room lookup.
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