We detect dormer leaks caused by wind. During strong winds and driving rain, you see drops along the window frame or fascia boards. We find the source quickly.
We check EPDM or bitumen, lead flashing, roof trim, sealant joints, side walls, gutter, and the connection to the tiled roof. We find the leak using a smoke test, thermography, and ultrasonic or dye tests.
This way, you prevent damage from wind pressure and driving rain and receive clear advice and a report from Ultrices leak detection. Read our Google reviews on detecting dormer leaks caused by wind and see the score of 5 out of 5.
What is dormer leakage in windy conditions and why it goes wrong precisely then
Detecting wind-induced dormer leaks revolves around water being pushed against and into the dormer under wind pressure. Wind-driven rain increases the pressure difference between the outside and the inside, causing micro-gaps around window frames, roof trim, fascia boards, side panels, and lead flashing to let water through. Capillary action then draws moisture further inward. During storms or strong winds, this results in sudden dampness, brown discoloration, drafts, and sometimes drips around trim or the ceiling. At Ultrices Leak Detection, we link building physics with measurement data from the KNMI and combine this with visual inspection and test measurements so that you know exactly where the dormer is leaking when it is windy and how to repair it sustainably.
How we detect dormer leaks caused by wind without demolition work
We work entirely without demolition or breaking, using professional detection equipment from FLIR, Trotec, and Testo, among others. With thermography, we detect thermal bridges and moisture traces behind finishes. Using smoke tests and blower door measurements, we simulate wind pressure to make air leaks visible. With mist and water tests based on the principles of NEN EN 1027 for the watertightness of facade elements, we carefully test transition details such as the window frame connection to the roofing and lead flashing. Tracer gas and endoscopy reveal hidden seepage and capillary routes. Our measurement protocols safely comply with VCA VOL and NEN 3140 and are included in the documentation for your insurer. If you would also like this done without breaking open structures, please take the link to leak detection without demolition or breaking.
Common causes and weak spots around your dormer
- Window frame connection and sealant joints sealant aging, cracks, or an unprimed substrate allowing wind-driven rain to penetrate, especially under the bottom sill.
- Lead flashing and risers Cracks in lead, poor clamping, or flashings that are too short on roof tiles or zinc, causing water to creep up in side winds.
- Roofing and details Loose EPDM or bitumen folds, roof trim that is too short, or open corners at a concealed gutter or valley causing backflow.
- Side cheeks and fascia boards open seams, delamination of sheet material, poor gap sealing and missing waterproof membrane
- Ventilation and ducting open grilles or cable entries without a rain cap, causing negative pressure to draw water inwards up to the ceiling
Our step-by-step approach to wind-driven rain
- Intake and context We record the weather conditions, wind direction and strength, the moment of leakage, and check KNMI data.
- Visual inspection Inspection of roofing, roof trim, lead flashing, concealed gutter, window frame, and side panels, including photo documentation.
- Thermography and moisture measurement Infrared scan and dielectric measurements to map hidden moisture trails and thermal bridges.
- Smoke test and pressure test simulation of wind pressure to locate air leaks and determine the penetration route
- Targeted water test controlled mist and section-by-section testing in accordance with principles from NEN EN 1027 to confirm the exact leak location
- Report and advice Within three days, you will receive a substantiated expert report including the cause of the impact and a repair plan, including photos and a measurement report.
Leak detection process request
Signs indicating dormer leakage in wind
- Stains and rings fresh damp patches around the trim on the ceiling or sides that are especially visible after wind and rain
- Draft and cold snap Palpable air currents along the window frame or side indicate a gap seal that carries water away.
- Drops or sound A ticking sound in the fascia board or ceiling during gusts of wind indicates backflow and seepage.
- Mold and musty smell Prolonged moisture exposure behind the finish causes microbiological growth and degradation of insulation.
Practical examples that you recognize
In the Randstad, we often see EPDM on dormers with open corners where concealed gutters push water behind the side wall during southwesterly winds. In North Holland and Friesland, coastal winds and salt spray play a role, causing sealant joints to age more quickly. In Utrecht and Gelderland, we regularly discover leaks along lead flashing on pitched tiles because the flashing is too short and capillary action occurs. Using tracer gas, we recently found a leak route in Rotterdam via an untaped screw in the roof trim that only allowed water through during westerly winds. Each case concluded with targeted repair advice, such as replacing sealant with SKG IKOB-tested systems, extending the roof trim, re-grinding lead, or applying waterproofing membrane behind the side wall.
Quality assurance and fast assistance from Ultrices leak detection
With over fifteen years of experience, 24-hour service, and emergency capacity, we are on-site nationwide within an hour for storm damage. We work for both private and business clients and have five out of five stars in Google reviews. Our measurement protocols are safe and documented, VCA VOL and NEN 3140 certified, and align with policy conditions, ensuring you often receive coverage from your insurer with our report. We offer no solution, no payment thanks to our no cure, no pay policy with a ninety-nine percent success rate. You want certainty and zero risk; choose specialist dormer leak detection by specialists , or see how we conduct targeted testing for wind and water problems on roofs for targeted roof leak detection. Call or WhatsApp 085 080 55 42 or email info@Ultriceslekdetectie.nl for immediate assistance.
What you concretely get and how to switch gears quickly
- Full leak detection investigation without demolition with thermography, smoke test, mist and, if necessary, tracer gas and endoscopy
- Extensive expertise report within three days, including photos and measurement graphs, clear cause and repair advice for the contractor
- Guarantee on the route professional equipment deployable nationwide and guarantee of insurance coverage where applicable
- Transparent follow-up We coordinate the repair sequence and can perform a control measurement after the repair to prove watertightness.
If you want clarity today regarding dormer leakage caused by wind, choose our fast route and request your quote via our free quote for dormer leak detection within 24 hours . We schedule immediately and help you limit the damage.
Frequently asked questions
How do you track down a dormer leak that only occurs during strong winds?
We simulate wind-driven rain with a controlled pressure test and a targeted spray and mist test around fascia boards, side panels, and connections to the roof surface. While building up pressure, we use smoke to make air leaks visible. Using infrared thermography and precise moisture measurements, we track the cold and moisture traces so you can see exactly where water and wind are penetrating, without any demolition work.
For suspicious details such as lead flashing, window frames and sealant joints, roof penetrations, valley gutters, and rainwater drains, we use endoscopy and a safe dye test to confirm the water's path. Thanks to fifteen years of practical experience, VCA VOL certification, and NEN 3140 certification, we work quickly and accurately. If urgent assistance is needed, we will be on-site within an hour.
What are the causes of leakage around the dormer during wind and driving rain?
The biggest culprit is often wind pressure build-up, pushing water against and under details. Think of open gaps at side walls, aged or poorly attached EPDM or bitumen on the dormer roof, worn-out sealant joints, loose fascia boards, leaking lead flashing in the tiled roof, clogged drains, and vulnerable seams around roof penetrations or ventilation hoods.
Capillary action and water backflow due to an incorrect waterproofing system or damaged battens can also draw moisture into the roof structure. We distinguish between structural and meteorological causes, using measurement data and imaging. If rainwater is simultaneously hitting your facade, read how we investigate this specifically by detecting rainwater penetration on the facade and avoid duplicate repairs.
How do you know if the leak is coming from the dormer, the roof, or the facade?
We work in phases. First, we replicate the incident with a combined pressure and spray test on zones, starting at the dormer and then the surrounding roof surface and adjoining facade. Using smoke visualization, we observe airflows, and with dye, we follow water precisely along seams, under the roof tiles, and at the waterproofing layer. Infrared images and hygrometer data capture the pattern.
This way, we pinpoint the source down to the last detail, such as a leaking compression fitting, a crack along the window frame, or a capillary path along the facade. If you are unsure whether the interior wall is also damp, see how a targeted moisture measurement of the interior wall reveals hidden damage. Everything is done non-destructively and results in clear repair advice.
How much does windy dormer detection cost and how quickly is it arranged?
You will receive a free, tailored quote within twenty-four hours. Thanks to our efficient measurement method and professional equipment, we often complete the inspection within a single visit. You will receive a comprehensive expert report within three days, including photos, a measurement report, and concrete repair recommendations. We work nationwide for private and business clients, collaborating with insurers and guaranteeing coverage where applicable.
We operate on a no-cure, no-pay basis with a proven success rate of ninety-nine percent. For emergencies, we are available 24/7 and can be on-site within an hour. If you wish to proceed immediately with your insurance claim, view our report for insurance purposes to help you recover faster and recover costs.
