You see a wet spot along the baseboard and the pressure is dropping. You want quick clarity without unnecessary breaking.
Using thermography with an infrared camera, an acoustic microphone, and a pressure test with tracer gas, we pinpoint the exact underfloor heating leak. We check the manifold, zones, and piping network, read the piping plan, measure moisture, and assess the screed and finished floor.
This way, you limit damage to a small drill hole and a neat spot repair. You receive a report with images, measurements, and exact coordinates for your insurance. By a certified leak detection specialist, so you can make a quick and confident choice.
Table of contents
What is a leak in underfloor heating and why exact location matters
A leak in underfloor heating is an unwanted escape of water or mixture from a pipe loop in the screed or concrete floor. This causes pressure loss, cold zones, damp spots, and eventually damage to the finish and structure. The trick is to find the exact location with minimal damage—meaning no demolition work—so that you can open up and repair in a targeted manner. At Ultrices Leak Detection, we combine smart measurement methods with experience in building physics and installation technology, so that you quickly have a stable installation again with low energy costs and a dry floor.
Brief history and structure of underfloor heating
Underfloor heating has existed since Roman times with the hypocaust system, but the modern variant came into widespread use with synthetic pipes from brands such as Wavin, Uponor, and Rehau. The basic setup consists of a manifold with flow meters and a pump from, for example, Grundfos or Wilo, control valves from Danfoss or Resideo, and loops in PEX or PE RT with an oxygen barrier. In Dutch homes, the piping is laid in a cement screed or anhydrite on insulation such as EPS or PUR. Knowledge of this setup helps to read a leak profile and pinpoint the source.
How do you find the exact location of a underfloor heating leak with minimal damage?
You find the exact location by linking signals to measurement data. We use thermal imaging, acoustics, and tracer gas to pinpoint the leak source to within a few centimeters. Thanks to this approach, there is no unnecessary demolition, and the floor finish, such as tile, PVC, parquet, or poured floor, is preserved as much as possible. The approach below is aligned with standards such as NEN 1006 and insights from organizations such as TNO, Kiwa, and TU Delft.
- Preliminary investigationYou tell me when the pressure drops, where you see cold spots or wet joints, and what type of floor you have, such as tile, laminate, PVC, parquet, or a poured floor.
- proofWe isolate the loop on the manifold and pressurize a calibrated manometer to record the loss per unit of time and rule out air ingress.
- Thermal imagingUsing a FLIR or Testo camera, we create a thermogram during heating or cooling, making temperature anomalies around the leak visible as cold circles or irregular heat patterns.
- Acoustic localizationUsing a Trotec correlator or ground microphone, we determine the peak noise of escaping water, even through thick concrete and under finished floors.
- Trace gasWe fill the loop with a hydrogen-nitrogen mixture and capture outflow with a gas sniffer, ideal for thick screeds or where thermal imaging is limited.
- Targeted opening and recovery adviceWe mark the exact location, advise on repairs per floor type, and provide a complete report for the insurance company and contractor with photos, measurement graphs, and conclusions.
Signals you recognize early
- Pressure loss at the boiler or manifold: the pressure gauge drops and you have to top up regularly, which can cause air bubbles and corrosion.
- Cold strips in a warm zone: a loop that no longer flows through shows a hole in the pattern on a thermal image.
- Damp spots or bulging laminateWith PVC and laminate, you see edges curling up or dark streaks appearing in skirting boards and joints.
- Higher consumption and longer heating time: the pump runs longer and the thermostat keeps calling, but comfort lags behind.
- Soft hissing or ticking sound: around skirting boards or at the distributor, you hear a slight hissing sound that can be clearly localized amplified with our measuring set.
No-demolition methods that really work
- ThermographyInfrared images show the pipe layout and anomalies, even under tiles and cast floors, provided they are properly stimulated with hot or cold water.
- Acoustic correlation: two or more sensors measure the sound time difference so that the exact leakage distance on the loop is calculated.
- Trace gas detection: an inert mixture seeks its way up along the shortest route; our detectors recognize minute concentrations at the surface.
- Moisture mapping and salinity measurementUsing capacitive and conductive meters, we map capillary spread so that secondary damage remains limited.
- Endoscopy via skirting board or joint: a microcamera looks into an existing seam to provide confirmation without damaging the finish.
Types of flooring and what that means for leak detection
Every finish behaves differently. Tiles with tight grout retain heat, meaning thermography requires extra attention for heat management. PVC and vinyl conduct heat quickly, causing patterns to stand out sharply. Parquet and laminate can bulge due to moisture but allow acoustics to pass through well. Cast floors are homogeneous, meaning tracer gas often makes the difference. In a floating screed with insulation, moisture spreads horizontally; therefore, we combine thermal imaging with gas detection to distinguish the source from the resulting damage. If you want to know how we handle this for each situation, please view our explanation about underfloor heating leak detection.
When do you switch on Ultrices leak detection
Call us in as soon as you notice pressure loss, wet joints, or cold spots. The sooner we take measurements, the less damage there will be. We work with equipment from FLIR, Testo, Bosch, and Trotec and are familiar with the characteristics of pipes from Wavin, Uponor, and Rehau. Our reports meet the requirements of insurers and repair companies and contain clear photos, measurements, and repair recommendations per floor type. If you want to read everything about non-destructive testing, visit our page about Leak detection on underfloor heating without heels.
Practical benefits and guarantees
– Comprehensive expert report within three days of the investigation
– You will receive a free price indication within twenty-four hours
– More than fifteen years of experience in residential and non-residential buildings
– Five out of five stars on Google reviews
– Without disruptive force in the investigation process
– No solution, no payment, no cure, no pay
If you want to know immediately what it costs for your situation, request a suitable quote in the same minute via free quote for underfloor heating leak with minimal damage and send photos of your distributor and floor.
Common approach per problem profile
- Rapidly dropping pressureWe start with a pressure test and acoustics, followed by tracer gas to fix the source in the case of a thick screed or when thermal imaging provides little contrast.
- Local damp patch without visible crackThermography during targeted heating visualizes the anomalous pattern and reduces the opening point to a tile or smaller surface.
- Cold strip near the facadeWe check insulation breaks and pipe routing with thermal imaging, supplemented with endoscopy through an existing joint.
- Bulging laminate or PVCMoisture mapping determines the spread, tracer gas confirms the exact pipe rupture without removing the finish.
If you want to delve deeper into thermal imaging and what to look out for, check out our explanation about thermographic inspection for underfloor heating.
Why this combination of measurements yields the exact location
No single measurement tells the whole story. Thermal imaging shows the progression, acoustics provides a distance measurement, and tracer gas delivers a surface signal. Together, they form conclusive evidence that matches the construction of your floor and the characteristics of the pipes used. By correlating this data with knowledge from ISSO publications and practical experience throughout the Netherlands, we can pinpoint the exact location where your professional can open and repair precisely with minimal cutting. That is how you find the exact location of a underfloor heating leak with minimal damage and keep the rest of your home intact.
Steps towards recovery and aftercare
- Marking and signing: we place a small cross at the precise spot and record the position in the report with measurements from the walls.
- Open carefully: your installer or our partner opens the smallest possible area above the marking and exposes the pipe.
- Pipeline repair: with a coupling suitable for PEX or PE RT, the pipe is repaired and pressure tested at the manifold.
- Restore floor finish: tile or laminate is carefully repaired or replaced within the marked box.
- Final inspectionWe check flow and surface temperature to confirm comfort and output.
Frequently asked questions
1. How do you find the exact location of a underfloor heating leak with minimal damage?
You start with smart measurements without breaking anything. We first isolate the circuit at the manifold and perform a pressure test to record the pressure profile. Next, a thermal camera such as FLIR or Testo scans the floor. A leak often reveals an abnormal heat pattern because water locally cools or heats the screed and tiles. This allows you to quickly determine the suspected zone.
To pinpoint the exact location, Ultrices leak detection uses acoustic leak detection with geophon, moisture measurements, and, where necessary, tracer gas containing hydrogen that migrates through the screed and joints and is picked up by sensors. The spot is marked to the millimeter, so you only need to lift one joint or tile at most. If you want to see how this works in bathrooms, check out thermographic leak detection in the bathroom. here.
2. Which method works best to detect a leak in underfloor heating without breaking anything?
The best approach is a combination. Thermography quickly shows anomalous thermal images, especially with tiles and anhydrite. Acoustic leak detection using a geophon or ultrasonic microphone listens for the characteristic hissing sound of escaping fluid. Tracer gas with a small amount of hydrogen in the circuit is ideal for micro-leaks, because it is light and volatile and rises through tiny cracks, after which sensors locate it precisely.
Additionally, a pipe locator helps map bending routes, and hygrometers and calcium carbide tests provide a basis for detecting hidden moisture. In practice, this layered protocol works fastest and causes the least damage. For PVC or laminate, we switch the order because thermal images read differently than on stone. Ultrices Leak Detection tailors the sequence per floor construction and installation type for maximum accuracy.
3. What signs indicate a leak in your underfloor heating and how do you rule out other causes?
Watch out for a constant pressure drop in your central heating system, more frequent refilling, a warm or cool spot on the floor, wet grout, mold edges, limescale deposits, or a water meter that keeps running while everything is switched off. The pump may also switch on more frequently, and a slight boiler noise may occur due to air entering through the leak.
First, rule out other causes. Check the expansion vessel for pressure and age, inspect the manifold for leaking connections, check radiator connections and shut-off valves, and bleed the system. Perform a nighttime water meter test with all taps closed. If the pressure continues to drop or the meter keeps running, targeted leak detection on the underfloor heating is the fastest and cheapest next step.
4. How much does leak detection for underfloor heating cost, and are the costs often reimbursed?
The price depends on the floor finish, accessibility, and the number of groups. As an indication, expect a survey rate that includes measurements, reporting, and clear marking of the break area. You typically save many demolition hours because only a small section needs to be opened, which significantly reduces total repair costs.
Many buildings insurance policies cover the inspection and sometimes also the targeted opening and repair around the leak. Ultrices Leak Detection provides a complete leak detection report with photos, measurements, and repair advice that you can submit immediately. Read more about a leak detection report for your insurer. on this page for clear expectations and lead time.
5. Can you find a underfloor heating leak yourself, or is it better to call in a specialist immediately?
You can do some smart preliminary work yourself. Note the pressure loss per 24 hours, shut off groups one by one at the manifold, and check if the leak is confined to a single circuit. Look out for localized damp or hot spots and test the water meter when everything is switched off. Avoid gambling with demolition work; that usually makes the damage greater than necessary.
A specialist brings speed and certainty. Using infrared thermography, acoustics, and tracer gas, Ultrices Leak Detection usually locates the leak in a single visit, and demolition is limited to the bare minimum. If the leak is in your bathroom floor and needs to be resolved quickly, check out our emergency service for bathroom underfloor heating. through this link so that you minimize damage and downtime.