Plumber Red Seal · Question
While searching for a suspected slab leak under a concrete floor, you have confirmed the presence of moisture by drilling a small exploratory hole. What advanced non-destructive method is best suited to precisely locate the leak point before breaking up the slab?
Radiotracer gas detection is highly effective for pinpointing slab leaks. A non-toxic tracer gas (e.g., hydrogen-nitrogen mix) is introduced into the pipe, and
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Question: While searching for a suspected slab leak under a concrete floor, you have confirmed the presence of moisture by drilling a small exploratory hole. What advanced non-destructive method is best suited to precisely locate the leak point before breaking up the slab?
Answer options:
- Infrared thermography
- Electro-acoustic leak detection ✅ Radiotracer gas detection
- Pressure testing the entire system
Correct answer: Radiotracer gas detection
Explanation: Radiotracer gas detection is highly effective for pinpointing slab leaks. A non-toxic tracer gas (e.g., hydrogen-nitrogen mix) is introduced into the pipe, and specialized sensors detect where the gas escapes through the slab. Electro-acoustic detection can be useful, but tracer gas offers superior precision for slab leaks when audible sound is ambiguous or muffled.
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