A shower wall is tiled directly over standard drywall in a wet area without an approved wet-area backing or waterproofing system. What is the issue?
Correct Answer
C) The substrate is unsuitable.
Wet-area tile assemblies need suitable backing and waterproofing or water-resistant details, not ordinary drywall alone.
Why This Is the Correct Answer
Wet-area tile assemblies need suitable backing and waterproofing or water-resistant details, not ordinary drywall alone.
Why the Other Options Are Wrong
Option A: Proceed with the finish work where a shower wall is tiled directly over standard drywall in a wet area without an approved wet-area backing or waterproofing system, and defer the substrate correction until punch list.
Proceed with the finish work where a shower wall is tiled directly over standard drywall in a wet area without an approved wet-area backing or waterproofing system, and defer the substrate correction until punch list. addresses a neighboring field issue, but not the condition or method control required for tile substrate.
Option B: The grout color will cure faster.
The grout color will cure faster. addresses a neighboring field issue, but not the condition or method control required for tile substrate.
Option D: Treat the item as a color or trim preference where a shower wall is tiled directly over standard drywall in a wet area without an approved wet-area backing or waterproofing system, instead of correcting the finish installation requirement.
Treat the item as a color or trim preference where a shower wall is tiled directly over standard drywall in a wet area without an approved wet-area backing or waterproofing system, instead of correcting the finish installation requirement. addresses a neighboring field issue, but not the condition or method control required for tile substrate.
Memory Technique
Tile Substrate method for Inspecting Bathroom: condition first, tool second.
Reference Hint
Study anchor (closed-book): memorize Tile substrate from California Residential Code, California Code of Regulations Title 24. / Title 24 California Residential Code wet-area wall finish concepts; know the rule or calculation trigger without relying on exam-room lookup.
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