🏠 ATG LC15/LC30/MAX – Anti-Damp Systems for Damp Walls and Rising Damp
Wall Drying Without Electricity – A Natural Solution Against Damp and Rising Moisture
🌿 A Passive Technology for Long-Term Moisture Control
Damp walls are often caused by rising damp: moisture from the ground travels upward through porous materials such as stone, brick, concrete, and mortar. This can lead to blistering, mould, salt deposits (efflorescence), musty odours, and reduced indoor comfort.
The ATG LC15, ATG LC30, and ATG MAX are wall moisture control systems designed to help counter rising damp over time by influencing the wall’s magnetic environment (geomagnetic polarity principle). They operate autonomously, require no wiring and no electricity, and are designed to be maintenance-free, making them suitable for buildings where a non-invasive approach is preferred.
⚙️ How Does It Work?
Walls naturally generate a potential difference that encourages moisture to rise. ATG devices capture this magnetic field and emit a reversed geomagnetic counter-field.
As a result, water stops rising, and the walls gradually dry through natural evaporation.
✅ Shared Advantages of All 3 Models
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Fully autonomous – no power or batteries required
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No electromagnetic radiation
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Easy, fast installation – no renovation work
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No drilling or wall alteration
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Silent, vibration-free, maintenance-free
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Ideal for homes and historic buildings
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Made in France – 10-year warranty
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Supplied with installation guide and usage recommendations
📘 User Manuals
User Manual ATG LC15
Download the manual
User Manual ATG LC30
Download the manual
User Manual ATG MAX
Download the manual
📏 Technical Specifications
ATG LC15
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Action radius: 7.5 meters
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Coverage diameter: 15 meters
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Format: compact cylindrical unit
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Wall installation with double-sided adhesive
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Mounting height: 1.5 to 2.0 meters, at least 1.5 m from any electric device
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Oriented toward magnetic north
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Passive operation, no power required
ATG LC30
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Action radius: 15 meters
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Coverage diameter: 30 meters
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Format: standard cylindrical unit
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Same installation guidelines as LC15
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Passive operation, no power required
ATG MAX
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Action radius: 30 meters
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Coverage diameter: 60 meters
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Format: reinforced casing for large spaces
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Same installation and orientation rules
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Passive operation, no power required
🛠️ Shelf or Cabinet Installation (Under Conditions)
The ATG device may be placed on a shelf or inside a cabinet (e.g., closet, cupboard) on the ground floor, if the following conditions are met:
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The furniture must be stable and fixed to avoid vibration or movement
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The unit must be firmly secured using strong double-sided adhesive or a stable support
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It must be positioned 1.5 to 2.0 meters above ground level
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It must be located more than 1.5 meters away from any electrical source (excluding standard wall outlets)
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It must be oriented toward magnetic north (use a compass or app)
📌 Do not move the device once installed.
👉 It is not necessary to place it directly on a damp wall. Installation at the center of the home or treatment area is often the most effective, allowing better distribution of the geomagnetic field.
🎯 Expected Results
Initial effects are usually visible within 18 to 24 months after installation. As the wall dries, it regains its natural insulation properties.
🧱 Tips for Optimal Drying Results
1. Remove Film-Forming Coatings
Scrape off plastic paints, waterproof renders or other sealed coatings about 10–20 cm above the affected area. This allows the wall to breathe and release moisture.
2. Ensure Proper Ventilation
Improve air circulation:
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Functional mechanical ventilation system (VMC) or window ventilators
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Door undercuts: 1.5 cm in dry rooms, 2 cm in humid rooms
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Window air inlets if necessary
3. Restore the Walls After Drying
Once dry:
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Brush off hygroscopic salts on the surface
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Re-plaster with lime-based render and anti-salt additive
4. Install Drainage if Needed
In case of lateral infiltration or hydrostatic pressure, perimeter drainage may be necessary to divert groundwater from foundations.
⚠️ What This Device Does Not Treat
ATG wall drying devices are not designed to address:
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Water infiltrations from cracks, gutters, roofs, or damaged masonry
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Damage caused by flooding or plumbing leaks
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Existing mold on surfaces (must be cleaned separately)
Installing your device ATG
| Dimensions | N/A |
|---|---|
| Modèles / models | ATG LC15, ATG LC30, ATG MAX |







Jean-Jacques B. –
“I bought a geomagnetic device in December 2021 […] and I am fully satisfied with it.”
ATG LC15. Extract from a testimonial received by email. The customer confirmed a rating of 5/5.
Ribaud –
« I bought and installed an ATG30 device two years ago. Things really are much better, although some more time is needed; the damp had been there for so long. I am satisfied. »
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claudio –
« I ordered this 30-metre device and installed it myself last year. It has been going well since. It seems some more time is needed, but I am happy. Thank you. »
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chantal –
« Thank you for your service. I have had a Geostop for three years and the renovation completed four months ago is holding up very well. The results are impressive and the drying is perfect. »
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yasmine –
« I installed a Geostop in March 2018. Everything is perfect and there is no more damage. Excellent equipment. »
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Bénédicte –
« I recommend Humidistop France. I am very happy with the drying of the house. I installed a GEOSTOP two years ago and have noticed a big difference in my walls. »
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Damien –
« I was pleasantly surprised by the Black Friday offers. I had always hesitated, and the price finally persuaded me to order. I am now waiting to receive my Geostop. »
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Antoine –
« Very satisfied with the GEOSTOP; it works very well. »
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Marie –
« Excellent telephone service and plenty of advice before considering the GEOSTOP solution. A professional approach to properly identifying rising damp. »
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Luc –
« I was pleasantly surprised by the adviser's guidance and professionalism. I ordered a Geostop 30 and am now waiting for the result. »
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Marie –
« I received my GEOSTOP and look forward to the results. Thank you to Humidistop for all the advice. »
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Yannick –
« With the ATG GEOSTOP, the damp in my house walls had decreased by more than 50% after a year. I recommend the device and the Humidistop team. »
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