What Causes Wall Dampness

1. Rising damp (ground moisture)
Mechanism: Moisture from the soil moves upward through porous brick/concrete via capillary action.

Common causes:

Missing or failed damp proof course (DPC)
Old buildings with no proper moisture barrier
Ground level higher than external waterproof layer

Typical signs:

Damp patches starting from bottom of wall
Salt deposits (white powdery efflorescence)
Peeling paint near floor level

2. Penetrating damp (rainwater ingress)
Mechanism: Water enters through external wall defects.

Common causes:

Cracks in plaster or brickwork
Poor exterior waterproofing
Failed roof edges, gutters, or flashing
Porous or unsealed exterior paint

Typical signs:

Random damp patches at mid-wall or top areas
Worse during heavy rain
Localised wet spots instead of uniform dampness

3. Condensation (internal humidity problem)
Mechanism: Warm moist air hits cold wall surface → water droplets form.

Common causes:

Poor ventilation (sealed rooms, no airflow)
High indoor humidity (cooking, drying clothes indoors)
Air-conditioning mismatch (cold walls + humid air)

Typical signs:

Mold growth (black spots)
Damp feeling on surface, not deep structural wetness
Worse in corners, behind furniture, or north-facing walls

4. Plumbing leaks (hidden internal source)
Mechanism: Water leaks from pipes inside walls or slabs.

Common causes:

Burst or cracked water pipes
Bathroom or kitchen pipe joints leaking
Roof tank or overhead plumbing issues

Typical signs:

Constant dampness (not weather-dependent)
Localised wet patch that expands over time
Possible ceiling damp below bathrooms

Xem chi tiết What Causes Wall Dampness trên Trang Web Chính Thức Know more about this service. More Details

LTL Smart Solutions Sdn Bhd Vietnam

Liên hệ với chúng tôi

Vietnam