Tap on the wall to listen for hollow sounds

If you suspect that a wall in your home may be damp, one of the simplest ways to check is to tap on it. If the wall sounds hollow, it could be a sign that moisture has penetrated the wall and caused the plaster or drywall to detach from the underlying studs.

Other signs of dampness in a wall

• Discoloration or staining on the wall
• Musty or moldy smell
• Condensation on the wall
• Loose or peeling wallpaper
• Bubbling or peeling paint

How to repair a damp wall

If you find evidence of dampness in a wall, it’s important to repair it as soon as possible to prevent further damage. The first step is to identify the source of the moisture and fix it. This may involve repairing a leaky roof, sealing a crack in a foundation, or improving ventilation in the room.

Once the source of the moisture has been fixed, you can begin to repair the wall. If the plaster or drywall is loose, it will need to be reattached to the studs. You may also need to replace any damaged insulation or drywall.

Preventing dampness in walls

There are a number of things you can do to prevent dampness in walls:

• Keep your home well-ventilated.
• Repair any leaks in your roof or foundation.
• Use a dehumidifier in damp areas.
• Avoid hanging wet clothes on walls.
• Install a vapor barrier in your walls.

By following these tips, you can help to keep your home dry and free of dampness.