Internal Cold Mains Leak Detection in Baildon

Symptoms

The occupants of a property in LS16 noticed an unusual spike in their utility bills and sought to understand the cause of abnormally high water consumption. With no visible signs of water damage and no obvious explanation for the usage, the situation pointed toward a concealed leak somewhere within the internal pipework.

An engineer attended site to carry out internal leak detection and establish the source of the problem.

On arrival, an internal meter located beneath the kitchen units was observed showing continuous water usage despite no known demand being active in the property. This confirmed that water was actively escaping somewhere within the system, even though nothing could be seen at surface level.

The absence of visible damage made it likely the leak was concealed beneath the ground floor structure.

Methods Used

The investigation began with flow metering to quantify the rate of uncontrolled consumption, followed by step testing to isolate which supply — hot or cold — was responsible. Once the cold supply was confirmed as the source, tracer gas was introduced into the cold main and a full property sweep was completed using a specialist gas analyser.

Elevated readings around the cold feed to the washing machine in the utility room identified an area of concern, and a ground microphone was then used to carry out acoustic profiling of the utility floor, which supported the likelihood of a leak beneath the surface.

With the client's agreement, tiles in the utility room were lifted to allow direct access and visual inspection of the pipework below. This methodical approach — characteristic of thorough internal leak detection — meant the exact point of failure could be confirmed before any repair work began.

A pressure test across all supplies at the end of the visit verified that no further issues were present.

Investigation Process

1. 1
   Site Attendance and Meter Observation

   The engineer attended the property in LS16 to investigate high water consumption. The internal meter beneath the kitchen units was found showing continuous usage with no demand active.

2. 2
   Flow Metering

   Initial monitoring confirmed uncontrolled consumption of approximately 0.3 litres per minute, establishing the scale of the active loss.

3. 3
   Step Testing

   The hot and cold supplies were isolated in turn. Usage continued when the hot supply was isolated but ceased with the cold, confirming the fault lay on the cold supply.

4. 4
   Tracer Gas Introduction and Property Sweep

   Tracer gas was introduced into the cold main and a full sweep of the property was completed using a specialist gas analyser. Elevated readings were detected around the cold feed to the washing machine in the utility room.

5. 5
   Acoustic Profiling with Ground Microphone

   A ground microphone was used to carry out acoustic profiling of the utility floor. The results supported the conclusion that the leak was located beneath the utility floor surface.

6. 6
   Tile Lifting and Leak Confirmation

   With the client's agreement, tiles in the utility room were lifted. A puncture in the cold feed pipe was found beneath the floor, with the foundations saturated and pockets of standing water present.

7. 7
   Repair

   The damaged section of pipe was removed and reconnected using a 15 mm push-fit coupler, restoring the integrity of the cold supply.

8. 8
   Pressure Test and Verification

   A pressure test was carried out on all supplies and showed no loss. The internal meter confirmed no further uncontrolled usage, verifying the repair was successful.

Result & Outcome

The leak was traced to a puncture in the cold feed pipe beneath the utility room floor. The foundations in this area were found to be fully saturated, with pockets of standing water present, indicating the leak had been ongoing for some time before it was detected through the rise in utility bills. Direct investigation through internal leak detection allowed the precise point of failure to be identified and addressed without unnecessary disruption elsewhere in the property.

The damaged section of pipe was removed and replaced using a 15 mm push-fit coupler. A pressure test on all supplies confirmed no loss, and the internal meter showed no further uncontrolled usage, providing clear verification that the cold main was sound at the point of completion.

Given the extent of saturation found beneath the utility floor, the foundations will require time to dry out fully before any reinstatement of the tiles takes place. The use of dehumidifiers and heaters is recommended to accelerate this process and ensure the area is properly dried before remedial works begin.