Rust or corrosion may appear on surfaces exposed to water or moisture. This can be a sign of dampness within the wall. If you notice any signs of rust or corrosion, it is important to investigate further to determine the cause and extent of the problem.

How to detect dampness in a wall?

There are several ways to detect dampness in a wall, including:

• Visual inspection: Look for signs of water damage, such as water stains, peeling paint, or crumbling plaster.
• Moisture meter: A moisture meter can be used to measure the moisture content of a wall. This can help you determine if there is a problem with dampness.
• Thermal imaging: Thermal imaging can be used to detect areas of a wall that are damp or wet. This can help you identify the source of the problem.

If you suspect that there may be a problem with dampness in a wall, it is important to have it investigated by a qualified professional. They will be able to determine the cause of the problem and recommend the best course of action.