Detect flat roof leaks immediately. If you see damp spots or blisters after a night of rain, we are ready with non-demolition leak detection.
We detect water infiltration in bitumen, EPDM, and PVC around skylight roof penetrations, drain seams, roof trim, and upstands using thermography, infrared smoke test, dye acoustics, endoscopy, and moisture measurement.
With Ultrices leak detection, you get flat roof leak detection with a clear report and repair advice so you can stay dry quickly. We score 5 out of 5 on Google and read our Google reviews about detecting flat roof leaks.
Table of contents
What is flat roof leak detection
Flat roof leak detection involves the targeted and non-destructive identification of where water is entering your roof structure and why. We combine building physics, such as capillary action and dew point, with practical detection so that you gain clarity quickly and prevent consequential damage. At Ultrices Leak Detection, you work with a VCA VOL and NEN 3140 certified team with fifteen years of experience, a 99 percent success rate, no solution, no payment, and an expert report that you receive within three days. We work nationwide for private and business clients, in collaboration with insurers, ensuring your file is well-substantiated for coverage. Our goal is to provide you with certainty regarding the cause, location, and repair advice for your flat roof leak, without any disruptive demolition work, using an approach suitable for EPDM bitumen, PVC, TPO green roofs, or roof terraces with penetrations and skylights.
Causes and types of leakage on a flat roof
Detecting a flat roof leak always starts with understanding the source and the type of water entry. Consider rainwater entering through details, condensation due to a disturbed vapor balance, or meltwater under ballast. Materials and details play a major role in this, as do NEN 3215 requirements regarding rainwater drainage and overflows. Common scenarios are shown below.
- Seam and detail error: detached overlap, crack in the base or incorrectly welded membrane around an upstand causes direct water ingress, especially with bitumen and PVC
- Passage and roof penetration: leakage along solar panel mounting cable gland or vent due to incorrect sleeves or outdated sealant
- Drainage and emergency overflow: clogged rainwater drainage or insufficient capacity leads to puddle formation and floating lanes with blisters and water ingress
- Material aging: UV aging, shrinkage or osmosis in PVC or bitumen, or point loading and perforation in EPDM and TPO around roof terrace and installations
Our techniques for detecting flat roof leaks without breaking.
We combine multiple measurement methods to ensure reliable flat roof leak detection, even for complex roofs such as inverted roofs, warm roofs, or green roofs with sedum. We tailor the method to the material, details, and weather conditions, and follow fixed protocols for safety and reproducibility.
- Thermography with infrared camera: with FLIR thermal images, we detect thermal bridges, wet insulation, and moisture barriers, ideal for PIR, EPS, XPS, or mineral wool
- Smoke test for details: controlled smoke from a smoke generator shows leaks at penetrations, skylight upstands, and valley rafters, safe according to NEN guidelines
- Fluorescein dye test: Colored water with UV inspection reveals flow paths and excludes or excludes capillary creep, especially effective for long water flows
- Tracer gas and ultrasonic: a hydrogen-nitrogen mixture and an ultrasonic sniffer detect micro-leaks under membranes or in hidden zones
- Moisture measurements and endoscopy: Capacitive Tramex measurements and endoscopy through existing joints objectify moisture percentages and provide insight into the structure
If you want to delve deeper into roof inspection without demolition and see immediately which methods we use, read on at leak detection without heels or for a broader roof inspection via Specialist leak detection for roofs.
Step-by-step plan for detecting flat roof leaks at your location
- Intake and file: you share complaints, construction drawings, photos, and policy details so that we can form targeted hypotheses and bring the correct set of measurements
- Visual inspection: we check roof surface details, rainwater drains, overlaps, ballast, and penetrations, and document everything photographically
- Measurement strategy: we choose the combination of thermography, smoke test, dye tracer gas, ultrasound, and moisture measurements suitable for your roof structure and weather
- Validation and proof: we confirm the source with a second technique for conclusive proof and precisely delineate the repair area
- Report and repair advice: within three days you will receive an expert report with findings, cause, location photos, measurements, and repair steps for your roofer
Leak detection process request
Material and detail-specific approach for EPDM bitumen PVC and TPO
Each membrane requires a different strategy for detecting leaks on a flat roof. We tailor the temperature load and detailed inspection accordingly and incorporate normative details such as fire-safe detailing and wind load.
- EPDM: focus on perforations, shrinkage at edges and seams around skylights; smoke test and tracer gas are often decisive here
- Bitumen APP or SBS: attention to blistering, cracking and cold seams, thermography and dye show moisture in insulation and seam leakage
- PVC: sensitive to plasticizer loss and shrinkage, ultrasonic and visual inspection of hot air welds along risers and penetrations
- TPO: attention to welding point loads in installations and mechanical fastening, combination of thermography and smoke test works strongly
Signs and consequences of a leak on a flat roof
By detecting your flat roof leak in time, you limit consequential damage to the load-bearing structure, finishes, and installations. Pay attention to these signs and take immediate action.
- Local discolorations: brown spots or mold formation on ceilings, walls, or around domes indicate seeping water or condensation
- Pudding on the roof: persistent puddles of water around the rainwater drain increase the risk of seam loading and water ingress
- Peeling details: curling edges or blisters in the membrane betray underlying moisture or loss of adhesion
- Unexplained smellsMusty or bituminous odors combined with damp spots are a strong indication of a leak.
If you already see damp patches on the inside, a combined approach pays off, for example, a roof inspection combined with targeted roof leak detection inside and outside so that your entire water path is visible.
Lead time and insurance costs
You want speed, clarity, and certainty. We schedule immediately, often on-site within one hour in emergencies, work safely, and deliver a complete expert report that insurers understand. With a 99 percent success rate and no solution, no payment, your risk is practically zero. We help you with the notification and substantiation for coverage and liaise with your roofer for repairs. Call or WhatsApp 085 2505 217 or email info@Ultriceslekdetectie.nl for immediate assistance or to schedule your flat roof leak detection. If you want transparent insight into pricing and scheduling, you can now Request a free quote within 24 hours.
Frequently asked questions
What are the first signs of a leak in your flat roof and what to do immediately
If you see damp patches on the ceiling or wall, blisters in the bitumen, or loose seams around a skylight or roof trim, there is a good chance your flat roof is leaking. Droplets at the rainwater drain and a musty odor combined with mold also indicate seeping rainwater or condensation.
Switch off electrical circuits near wet ceilings, catch drips, and avoid walking on the roof. Call Ultrices Leak Detection immediately. We are available 24 hours a day, arrive nationwide within an hour, and work without demolition work. Are you unsure due to ceilings with damp circles? View detect ceiling leak including report.
How do we accurately locate a flat roof leak without demolition work?
At Ultrices leak detection, we combine thermography, smoke testing, dye testing, and moisture measurement to isolate the source. Depending on whether it is EPDM bitumen or PVC, we inspect seams, roof penetrations, skylights, and details at roof trim and emergency overflows. Using endoscopy, we look beneath the covering, and with ultrasound and acoustic methods, we measure hidden water trails, entirely without any demolition work.
For challenging roofs, we use tracer gas with hydrogen and nitrogen forming gas or perform a controlled spray test. Our VCA VOL and NEN 3140 certified specialists work with professional equipment and deliver 99 percent accuracy. Read how we locate rainwater penetration in facades via detect rain penetration on the facade.
How much does flat roof leak detection cost and is it covered by insurance?
At Ultrices Leak Detection, after a brief intake, you will receive a free quote within 24 hours with a transparent fixed rate for the investigation. We usually only require one on-site visit. We offer a no cure no pay policy, so you run no financial risk whatsoever if no solution is found.
You will receive a comprehensive expert report within three days, including a measurement report, photo file, cause of the problem, and targeted repair advice. We work with insurers and offer a guarantee of coverage if the policy reimburses leak investigation. If you want to know exactly how a plumbing insurance report works, view leak detection report for bathroom leak.
How quickly can you come for storm damage, and how long does the inspection on a flat roof take?
We are ready 24 hours a day during storms and heavy rain. Our emergency service is on-site nationwide within an hour and works safely at height. With more than fifteen years of experience and five out of five stars on Google, we handle every situation in a structured manner at Ultrices Leak Detection.
An inspection takes an average of sixty to one hundred and twenty minutes, depending on roof size, type of roofing, insulation, ballast, and accessibility of rainwater drains. Upon detection, we immediately provide temporary emergency measures and clear repair advice. Our report follows quickly so that you can take follow-up steps with the roofer and insurer without delay.