Mould on a wall: distinguish condensation, leaks and rising damp

Mould does not automatically make a wall a rising damp case. Where marks appear and when they return help to guide the checks that are needed.

Before choosing equipment, prepare a plan and dated photographs. Humidistop provides product pages and instructions so you can examine the reference and positioning before purchase. If the moisture cause remains uncertain, clarify it before deciding on treatment and identify any independent repairs still needed.

Moist air or incoming water

Examine cold surfaces, corners and areas behind furniture alongside use of the room and ventilation. If marks change after rain or are near pipework, look for a leak or penetrating water. A hygrometer provides information about room air, but does not determine the water’s origin throughout the wall. Do not infer the cause from the colour of a mark alone.

Choose the matching intervention

ATE and ATG are offered for rising damp in walls. They do not replace suitable ventilation and are not mould-cleaning products. Different causes can coexist and need separate responses. Document marks before covering them. When cleaning, follow the product precautions and obtain suitable help for extensive or inaccessible areas. Do not postpone an independent repair in the expectation that the device will compensate for it.

Before you decide

• Document the walls and possible water sources.
• Check the model and installation instructions.
• Separate fitting, monitoring and reinstatement of finishes.

A practical question

Is a low-level mark always rising damp?

No. Leaks, penetrating water and cold surfaces can also affect low areas. The building context needs to be considered.

Compare our wall drying devices

The range includes mains-powered ATE LC15, ATE LC30, ATE LC30 PULSE and ATE MAX, alongside ATG LC15 and ATG LC30 without electricity. The devices are manufactured in Castres, France. Compare the diameter with the building layout and follow the instructions. The manufacturer’s 10-year warranty applies under its conditions. The device does not replace independent interventions on leaks, penetrating water or ventilation.

ATE LC15 · ATE LC30 · ATE LC30 PULSE · ATE MAX · ATG LC15 · ATG LC30