You want exterior wall leak detection to be handled quickly. We at Ultrices Leak Detection quickly find the source of water in facades, cavity walls, and jointing, including at window frames, expansion joints, and lead flashing.
Using thermography, moisture measurement, endoscopy, tracer gas, and smoke tests, we detect penetrating damp, capillary action, and hidden cracks, as well as leaky gutters, downpipes, and wall penetrations. Think of that damp spot near your interior wall.
We deliver a report and clear advice without demolition. Google reviews 5/5. Read our Google reviews about detecting exterior wall leaks.
Table of contents
What is detecting an exterior wall leak and why it matters
At Ultrices leak detection, tracing exterior wall leaks is about quickly and precisely finding any form of moisture penetration in the facade and cavity without any demolition or breaking. You don't want mold, peeling plaster, or a contaminated cavity that compromises your insulation. Using professional detection equipment such as FLIR infrared cameras, Protimeter and Tramex moisture meters, endoscopy, and smoke and dye tests, we analyze the facade envelope from the outside in. We follow proven protocols based on NEN 2778 for moisture in buildings and ISO 6781 for thermography, ensuring you receive reliable advice with a 99 percent success rate. Our team is VCA VOL and NEN 3140 certified, operates nationwide, and is ready to assist both business and private clients.
Signs and causes of leakage in your exterior wall
- Dark damp spots: visible rings around window frames, expansion joints, and window sills that worsen after rain, often accompanied by a musty odor or discoloration of the paintwork.
- Peeling plaster and paint: blistering, powdering, and flaking due to capillary absorption or driving rain penetrating through porous masonry or poor pointing.
- Mold and salt efflorescence: condensation and hygroscopic salts on thermal bridges such as lintels and concrete columns in the outer shell.
- Cold spots in the cavity: thermographically visible heat loss due to wet insulation material, cavity contamination, or open weep holes without proper ventilation.
- Infiltration at details: leaking sealant joints, cracks, aging lead flashing, leaking cavity wall ties, and poor connection between window frame and facade.
Techniques we use without demolition or breaking
We combine multiple techniques in a single investigation so that you know, not guess. With infrared thermography, we capture cold and warm patterns that reveal moisture transport and insulation problems. Endoscopy inspects the cavity for contamination, wet insulation, and missing battens. With a smoke test and a dye test, we simulate rain and wind pressure along seams and details. Acoustic and ultrasonic measurements and tracer gas with forming gas (95 percent nitrogen and 5 percent hydrogen) detect micro-leaks around penetrations. Our water tests follow clear test protocols for facade elements and glass and frame connections. If you would like to delve deeper into non-destructive testing, read how we perform this at leak detection without heelsFor detailed images of heat and moisture patterns, view our approach with thermography of facade leakageIf your concern is broader regarding the facade envelope, discover our service. Leakage inspection of facades.
Step-by-step plan from diagnosis to recovery advice
- Intake and hypothesisYou tell us what you see and when it occurs, we link this to precipitation and wind directions and create a test plan.
- Non-destructive measurements: thermography, depth and surface moisture measurements, endoscopy, and detailed inspection of joints, frames, and lead.
- Targeted tests: smoke and dye and water test on sub-areas to substantiate the cause of exterior wall leakage.
- Analysis and reportWe correlate measurement data with building physics such as capillary rise and driving rain pressure, and provide an expert report with photos and conclusions.
- Recovery advice and aftercare: concrete plan with priorities such as repairing jointing, impregnating and hydrophobing, replacing sealant joints, revising lead and details, and inspection with final measurements.
Leak detection process request
Common types of exterior wall leakage
- Facade penetration: Porous brick and hollowed-out jointing allow driving rain to penetrate; the solution is to repair the jointing and waterproof it with a vapor-permeable impregnator.
- Rain penetration at window frames: failing sealant joints and incorrect compression tape or poor slope of drip edges; the solution is proper sealing and detail correction.
- Cavity wall issuesCavity contamination or wet insulation transports water to the inner leaf; the solution is cavity cleaning and repair of open weep holes and anchors.
- Cracking and dilatationsThermal movement and settlement cause cracks with water ingress; the solution is crack repair and correct expansion joint filling.
- Detail leaks at roof and facade: damaged lead flashing and leaking connections at window sills and sill stones; the solution is professional replacement and correct installation of the waterproofing.
When quick action is essential
- Acute water damage after showers: visible inflow or continuous dripping along the inner leaf and ceilings, we are on site within 1 hour with emergency service.
- High energy billWet insulation loses insulation value and increases heat loss; thermography shows exactly where action is needed.
- Health complaints at homeMold growth and increased relative humidity affect comfort; targeted remediation prevents recurrence.
- Damaged finish: parquet, plasterwork, and paint suffer from lateral moisture migration; early detection saves significant repair costs.
Reporting, insurance and immediate assistance
You will receive a comprehensive expert report within three days, including measurement reports, thermographic images, and repair advice. Our reporting is accepted by insurers, and we assist you with the claims process with guaranteed coverage. We work entirely without disruptive demolition and operate on a no-cure-no-pay basis, ensuring you have a completely risk-free choice. With 15 years of experience, five out of five stars in Google reviews, professional detection equipment, and 24/7 service, you are assured of quick clarity. Call or WhatsApp 085 2505 217 or email info@Ultriceslekdetectie.nl for immediate assistance. If you want to take immediate action, request your free quote now within 24 hours and receive our tailor-made action plan.
Frequently asked questions
How do you detect an exterior wall leak without hacking and breaking?
We combine non-destructive techniques to detect exterior wall leaks without demolition. Examples include thermography with an infrared camera, accurate moisture measurements using capacitive and resistance sensors, cavity endoscopy, a smoke test to visualize air and water trails, and a controlled spray test along joints, frames, and sills. In this way, we expose capillary action, rain penetration, or a defective damp-proof course with measurable evidence.
At Ultrices leak detection, you receive a clear step-by-step plan, a comprehensive expert report within three days, and a free quote within twenty-four hours. Our specialists are VCA VOL and NEN 3140 certified, work nationwide with professional detection equipment, and operate on a no cure no pay basis. In emergencies, we are often on-site within one hour with a ninety-nine percent accuracy rate.
The facade only leaks when it rains: what is the cause and how can you solve it specifically?
When your facade only leaks during rain, the cause often lies in rainwater penetration into porous masonry or deteriorated jointing, open weep holes, cracks around window frames, a defective lead flashing, or a broken damp-proof course in the cavity. Contamination in the cavity or wet cavity wall insulation such as mineral wool, EPS, or PUR can also conduct water indoors. Sometimes a thermal bridge plays a role, leading to damp patches and mold.
We simulate rain and wind with a targeted spray test, track the water flow with smoke in the cavity, and check details with camera inspection and thermal imaging. This allows you to determine exactly where repairs are needed, such as injecting, repointing, sealing window sills, or repairing the water barrier. Read how we detect rain leakage from the facade via targeted facade inspection for rain leakage (/lekdetectie-diensten/gevel-lekt-alleen-bij-regen/).
How much does it cost to detect an exterior wall leak, and does your insurer cover the inspection?
The cost of detecting exterior wall leaks depends on the type of home, accessibility, and the necessary techniques. After a brief intake and photo analysis, we provide a fixed price indication, and you will receive a free quote within twenty-four hours. You do not pay for unnecessary hours, and if no solution is found, no payment is required. Our investigation often prevents substantial repair costs thanks to targeted repairs without demolition or breaking.
Many buildings insurance policies cover leak detection and consequential damage in the event of sudden or unforeseen water damage, depending on the policy and deductible. We work with insurers daily, deliver a complete expert report with measurement report and photolog within three days, and offer a guarantee of coverage where possible. Check what your insurer requires via report for facade leakage insurance (/lekdetectie-diensten/rapport-voor-verzekering-gevellekkage/).
What signs indicate an exterior wall leak and when should you call our emergency service?
Look out for damp patches or discoloration on interior walls, peeling plaster, white efflorescence, a musty odor near skirting boards, mold around window frames, cold, wet zones on the thermal envelope, and swelling wood. If you see droplet trails after a gust of wind or only during a heavy shower, that is a classic sign of penetrating damp or rainwater entering through joints, expansion joints, or window sills.
Call our emergency service as soon as water is actively entering, plaster is coming loose, or electricity poses risks. We are available day and night, often on-site within one hour, and work safely in accordance with NEN 3140. With over fifteen years of experience, professional measuring equipment, and five out of five stars on Google, we provide quick clarity and certainty with a no cure no pay policy and a coverage guarantee.