Why Poor Drainage Around Homes Leads to Damp Walls and Mould

It’s not only the blocks or materials that determine whether a house will last. The way water moves around a property plays a huge role in keeping walls dry. Poor drainage is one of the most common reasons homes in The Gambia suffer from damp walls, mould growth, and even foundation damage.

How Poor Drainage Affects Walls

  • Rainwater pooling: When rainwater isn’t guided away, it collects around the foundation and soaks into the walls.
  • Rising damp: Water moves upward through porous blocks, carrying salts that leave stains and weaken plaster.
  • Constant dampness: Damp ground near walls means the lower part of the wall never fully dries, creating perfect conditions for mould.

The Consequences

  • Ugly black mould on lower walls.
  • Peeling paint and damaged plaster.
  • Weakened structure over time.
  • Higher maintenance costs.
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Practical Tips

• Slope the ground: Ensure soil slopes away from the house so rain naturally drains outward. • Install drains or soak aways: Direct water into proper channels instead of letting it sit around walls. • Keep surroundings clear: Avoid piling soil, rubbish, or materials against walls, as these trap moisture.

Good drainage is one of the simplest yet most powerful ways to protect your home. A dry foundation and walls mean fewer repairs and a healthier living space.