Acoustic vs Thermal vs GPR Leak Detection: Which Method Is Right for Your Leak?
Compare acoustic leak detection, thermal imaging, and ground-penetrating radar to understand which technology works best for different leak scenarios in BC properties.
Acoustic Leak Detection
Uses sensitive ground microphones and listening devices to detect the sound of water escaping from pressurised pipes. Most effective for pressurised water supply lines and underground pipes.
Pros
- Works through concrete, asphalt, and soil
- Instant feedback during survey
- Effective on long pipe runs with correlation
- No special preparation required
Cons
- Less effective on plastic pipes that dampen sound
- Background noise can interfere
- Requires experienced technician for interpretation
- Limited effectiveness on low-pressure systems
Thermal Imaging
Infrared cameras detect temperature differences caused by moisture accumulation. Best for visible surface inspection of walls, ceilings, floors, and roofs.
Pros
- Non-contact inspection — no damage to surfaces
- Large areas can be screened quickly
- Provides visual evidence for reports
- Detects moisture behind finished surfaces
Cons
- Requires temperature differential to be effective
- Cannot see through insulation
- Best results in heating season
- Cannot detect leaks in underground pipes
Ground-Penetrating Radar (GPR)
Radar pulses image subsurface conditions to map pipes, voids, and soil saturation. Ideal for concrete slabs and underground utility locating.
Pros
- Sees through concrete and pavement
- Maps pipe locations and depth
- Detects voids and soil saturation
- Works on all pipe materials
Cons
- Requires skilled data interpretation
- Limited depth in conductive soils
- Slower than acoustic for long pipe runs
- Higher equipment cost
The Verdict
For most leak scenarios, a combination of methods provides the best results. Acoustic detection is the primary method for pressurised underground pipes. Thermal imaging is best for building envelope and interior moisture surveys. GPR is essential for concrete slab and buried utility applications. At LeakInspections.ca, we combine all three methods based on your specific situation. Call 604-239-9934 for a free consultation.