You see damp patches near window frames and the facade and you want to know where the moisture is coming from. With cavity wall leak detection, we at Ultrices Leak Detection trace the source of the leak or penetrating damp.
We inspect cavity walls, insulation, and jointing using moisture measurement, thermography, endoscopy, and a smoke test. This allows us to detect leaks at rainwater drains, lead flashing, cracking, or saturated cavity wall insulation.
You receive a clear report for the insurer and targeted repair advice. Our cavity wall leak detection scores 5 out of 5 in Google reviews, read experiences with cavity wall leak detection.
Table of contents
What is cavity wall leak detection and why it matters
Cavity wall leak detection involves specifically locating water infiltration or condensation problems between the inner and outer leaves of your facade. The cavity is designed for ventilation and moisture drainage, but moisture can migrate inwards in the event of clogged open weep holes, saturated insulation material, or defective cavity anchors. At Ultrices Leak Detection, we combine building physics with measurement data to precisely locate the source of moisture in the cavity wall. We provide this service nationwide for homes and businesses, with a 24-hour quote, 24/7 service, VCA VOL and NEN 3140 certification, collaboration with insurers, and an expert report within three working days. No solution, no payment with a no cure no pay policy and without any demolition or breaking work.
How cavity wall leak detection works with professional methods
We utilize non-invasive techniques to visualize leakage currents, capillary action, and thermal bridges. Using thermography according to EN 13187 and references from NEN 2778, we classify moisture types such as rain penetration, condensation, and rising damp. Tracer gas containing hydrogen in nitrogen detects micro-leaks in pipes running through the cavity. With endoscopy, we inspect cavity anchors, open weep holes, cavity battens, and the condition of insulation such as mineral wool, EPS beads, or PUR. Pressure-controlled water tests simulate driving rain to objectively demonstrate facade penetration. We work with brands such as FLIR for infrared, Protimeter and Tramex for moisture measurement, and Trotec for climate logging. Our advice is assessed against knowledge of TNO and Kiwa inspection protocols where relevant.
Causes of moisture in the cavity wall and recognizable signs
- Facade penetration: driving rain penetrates through porous masonry or cracks and bridges the cavity through soiling or bridging
- Defective jointing and sealant: leached joints, leaking expansion joints, or cracks around window frames cause water to seep in
- Soaked insulation: wet insulation material acts like a sponge and causes a thermal bridge, mold, and higher energy costs
- Clogged ventilation: sealed open weep holes or bird nests disrupt airflow and trap moisture
- Piping in the cavity: leaking rainwater drains or water pipes cause hidden water transport in the cavity
- Typical signs within: peeling plaster, mold spots, musty odor, cold zones on corners and along lintels
- Typical signs outside: salt efflorescence, dark streaks under drip sills, cracks at cavity anchors, wet streaks after rain
- Seasonal pattern: complaints that worsen with westerly winds and driving rain often indicate water penetration through the facade
- Energy loss: recurring thermal bridges and comfort complaints indicate saturated cavity insulation
If you want to delve deeper into the subject of cavity and facade impact, read on via clear explanation about moisture in the cavity wall.
Step-by-step research process without breaking
- Intake and hypothesis: we analyze complaints, year of construction, material, and orientation using weather data and photo analysis
- Thermographic baseline measurement: we capture thermal images with FLIR to mark anomalies and thermal bridges
- Moisture and salt measurement: point measurements with Protimeter and Tramex indicate the degree of saturation and salt balance
- Endoscopy in the cavity: via a mini drill hole, we inspect cavity width, insulation, cavity anchors, and contamination
- Targeted test: surface water test, smoke test or tracer gas in case of suspected pipe or air leak
- Analysis and report: we correlate measurement data with construction details, and provide a repair plan and insurance text
Leak detection process request
Measuring equipment and techniques that make the difference
- Thermography according to EN 13187: qualitative detection of thermal irregularities in facades with calibration
- Tracer gas H2 N2: ultralight gas molecules detect micro-leaks in water pipes in or along the cavity
- Endoscopy: visual inspection of cavity wall and insulation status with high-resolution camera
- Climate logging: relative humidity and dew point monitoring to detect condensation risk
- Waterproof facade: controlled water loading to demonstrate leakage paths at window frames and jointing
Curious how this works in practice without demolition? View our approach via cavity wall leak detection without chiseling.
Insurance report and repair advice
- Expert report: within three working days you will receive measurement results, thermal images, conclusions, and root cause
- Recovery priorities: plan with sequence and cost estimate for pointing, hydrophobization, cavity cleaning, or detail repair
- Insurance ready: clear description of the cause and photo references for quick coverage in the event of damage
- Quality Assurance: second opinion possible and follow-up measurement after recovery using the same protocols
Practical examples in the Netherlands
- Randstad apartment: penetration through the facade via cracked jointing and sealed weep holes, resolved with joint repair and reopening ventilation
- Detached house North Brabant: Saturated EPS in cavity due to leaking rainwater drain, tracer gas and endoscopy provided the exact fracture location
- Gelderland Office: thermal bridge along concrete lintel, thermography and climate logging proven condensation scenario and insulation detail repair
- House Groningen: leak around window frame due to aging sealant, waterproof test reproduced leak path, repair with new detailing
Engage Ultrices Leak Detection for a reliable diagnosis and a sustainable repair plan. We arrive on-site within an hour in emergency situations, operate nationwide for residential and commercial clients, achieve a five-out-of-five-star rating, and have a ninety-nine percent success rate. Call or WhatsApp 085 2505 217 or email info@Ultriceslekdetectie.nl. You can read more about related facade issues via targeted facade inspection in case of leakageIf you want immediate clarity and a suitable price, request your quote via Free quote for cavity wall inspection within 24 hours.
Frequently asked questions
How do you recognize a leak in the cavity wall and what are the causes?
You can often recognize a cavity wall leak by damp patches that darken after rain, mold growth, a musty smell, salt efflorescence, or peeling plaster. Sometimes an interior wall feels cold and damp, or you see discoloration around window frame seams and baseboards, especially after wind and driving rain.
Common causes include penetrating damp due to aging pointing, a defective damp-proof course or damaged lead flashing, clogged or sealed weep holes, and leaking rainwater drains. Saturated cavity insulation such as EPS, mineral wool, or PUR, cavity contamination, thermal bridges, and cracks around lintels and expansion joints also often play a role. At Ultrices Leak Detection, we specifically map out these factors.
How does leak detection in a cavity wall work without demolition?
We combine non-destructive methods such as thermographic scanning, accurate moisture measurements, and endoscopy via micro-drilling to inspect the cavity. Depending on the situation, we perform a smoke test or controlled spray test to visualize water ingress along weep holes, frame joints, or water barriers.
You will receive a clear expert report within three days with photographic images and measurement data. We work certified according to VCA VOL and NEN 3140, without any demolition or breaking work, with a 99 percent success rate and on a no cure no pay basis. If you would like to see how an endoscope image helps with diagnosis, take a look. This is how a cavity wall camera inspection works..
How much does cavity wall leak detection cost and do you get reimbursed by the insurance?
The investment depends on the building type, accessibility, facade height, and the presence of insulation. After a brief intake, you will receive a free fixed-price quote within 24 hours. Our 24/7 emergency service is available nationwide, and in emergencies, we are usually on-site within one hour.
Insurers often reimburse leak detection when it is necessary to limit consequential damage. We deliver an insurance-compliant report within three days and liaise directly with your claims handler. Please note that coverage always depends on policy conditions. Check your options via Check if your cavity wall leak is covered.
The cavity wall only leaks when it rains; what should I do now and how soon can you be there?
Close windows on the rain-facing side, ventilate to limit condensation, and move fragile items away from wet walls. Place towels near baseboards, take clear photos of the damp spots after showers, and note the wind direction and intensity of the rain. Call our emergency line immediately if damage increases.
Ultrices leak detection is available day and night and often on-site within one hour, without any demolition or breaking work. With 15 years of experience, a 5 out of 5 star rating, and a 100 percent risk-free approach, we tackle rain-related leaks in a targeted manner. Read practical steps and test methods at Read what you can do immediately in case of a leak during rain..