Finding leaks behind walls, under slabs, and inside ceilings without tearing everything apart requires specialized detection equipment and trained technicians who know how to interpret what the tools reveal. Done uses a combination of acoustic listening devices, thermal imaging, and moisture meters to locate hidden leaks accurately — minimizing unnecessary demolition and getting to the source of the problem faster. In Colorado, where temperature swings and hard water both stress plumbing systems, hidden leaks are more common than many homeowners realize.
Acoustic Leak Detection
Water escaping from a pressurized pipe under any surface — concrete, wood subfloor, or soil — creates vibrations that propagate through the surrounding material. Electronic acoustic listening devices amplify these vibrations, allowing a technician to distinguish the characteristic sound signature of a pressurized leak from background noise. Ground microphones placed at intervals help triangulate the leak’s location by comparing signal strength across multiple listening points. This technique is particularly effective for finding slab leaks — supply line failures under concrete foundations — which are otherwise extremely difficult to locate without invasive excavation.
Thermal Imaging (Infrared Camera)
An infrared camera detects temperature differences on surfaces. Water, whether hot or cold, creates a temperature differential relative to the surrounding dry building material. A hot water leak inside a wall produces a warm spot that the IR camera reveals as a distinctly different color. A cold-water leak may appear cooler than the surrounding drywall due to evaporative cooling. Thermal imaging is fast — a technician can scan an entire wall, ceiling, or floor section in minutes — and is completely non-invasive. It works best when there’s a reasonable temperature difference between the leak and the surroundings, so conditions matter.
Denver’s climate actually creates good conditions for thermal imaging in some scenarios. Cold supply lines against a heated interior wall, or vice versa in summer, can produce the contrast the camera needs to find even a slow leak.
Moisture Meters and Probes
Where thermal imaging suggests a moisture problem but can’t pinpoint it precisely, moisture meters provide a more direct measurement. A non-invasive meter reads moisture content in drywall or wood without penetrating the surface — pins hover near the surface and detect moisture via electrical resistance or radio frequency. Probe-style meters with pins can be inserted through drywall to measure moisture in the wall cavity directly, with only two small holes left behind rather than a large exploratory opening. Moisture readings help confirm a leak is active and guide the plumber to the precise location before any larger opening is made.
Pressure Testing and Flow Analysis
- Static pressure test: The plumber shuts off all fixtures and records supply pressure, then monitors it over time. A steady pressure drop with no open fixtures confirms water is escaping somewhere in the system — the test doesn’t find the location but confirms a leak exists
- Isolation testing: By progressively shutting off supply to different zones or fixtures, the plumber can narrow the leak to a specific section of the system, reducing the area to be inspected with imaging and acoustic tools
- Water meter monitoring: If your water meter has a flow indicator, watching for movement with all fixtures off confirms an active leak — this is useful as a first check before calling a plumber
Sewer and Drain Camera Inspection
Hidden leaks aren’t limited to supply lines. Sewer drain lines can crack, separate at joints, or be infiltrated by tree roots — problems that are entirely invisible from inside the home until sewage backs up or foundation soil shifts. A sewer camera (a waterproof video camera on a flexible cable) is run through the drain line from a cleanout access point, providing a live view of the pipe interior. The camera transmits its location above ground, allowing the technician to mark the exact spot where a problem exists without any exploratory digging.
This technology is also used before trenchless pipe lining to confirm the pipe’s condition and before purchasing an older Denver home to evaluate the drain line condition — a valuable step given that clay sewer lines from the mid-20th century are still present in many Front Range neighborhoods.
Why Professional Detection Pays for Itself
Guessing at a leak location and opening walls speculatively can result in significant drywall repair costs and may still miss the actual source. Professional detection typically finds the leak in one targeted location, meaning a smaller opening, less repair work, and faster resolution. Done’s technicians bring the right equipment to every leak investigation and have the experience to interpret what the tools show accurately.
If you suspect a hidden leak — unexplained water bill increases, damp spots on walls or ceilings, musty odors, or soft flooring — contact Done to schedule a leak detection visit. Our plumbing services include both detection and repair, and we offer emergency plumbing when the situation can’t wait.
