Inspect the External Walls

How to Detect Dampness in a Wall?

Dampness in external walls can result from various factors, including inadequate guttering, defective pointing, or damaged flashing. To identify dampness, it is important to:

Visual Inspection:

• Mold or Mildew Growth: Inspect for visible signs of mold or mildew on walls, especially in corners or areas with poor ventilation.
• Discoloration: Look for water stains or areas where the paint has cracked or peeled, indicating moisture penetration.
• Efflorescence: White or crystalline deposits on the wall surface suggest salts have been dissolved by water and recrystallized.
• Deteriorating Brickwork: Check for crumbling or disintegrating brickwork, which may indicate water damage.

Physical Inspection:

• Touching the Wall: Feel for dampness or coldness, which may indicate water seepage.
• Using a Moisture Meter: Utilize a moisture meter to measure the moisture content of the wall. Values above a certain threshold (typically 15-20%) indicate the presence of dampness.
• Lifting Floorboards: In ground-floor rooms, lift floorboards near external walls to check for dampness in the subfloor or joists.

Other Signs:

• Musty Odor: A musty or damp odor often accompanies excessive moisture in the walls.
• Increased Condensation: Excessive condensation on windows or walls can contribute to dampness.