What it contributes
Where the pipe and access arrangement are suitable, correlation compares leak noise captured at separate points. Route and material information contribute to interpreting the result.
What it cannot establish alone
Unknown pipe lengths, material changes and background sound can reduce usefulness. The result must be checked against the physical installation.
The method is selected for the conditions at the property. More than one kind of observation may be needed, and the report should make clear which findings support the proposed next step.
Before the visit
Keep existing pipe drawings and earlier findings available. Describe any restrictions on isolation, access or normal system operation. You do not need to choose or prepare a specialist test yourself.
A related service
Plan access beneath the hard surface.
Driveway water leaks