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Penetrating Damp Signs & Causes

What Is Penetrating Damp?

Penetrating dampness occurs generally as a result of poor external maintenance, i.e. defective rain water goods (gutters), which will allow rain water to penetrate the structure of the building. This can happen when the external renders are cracked, because of spalled brickwork, or even due to roof defects.


What Are The Signs Of Penetrating Damp?

  • Wallpaper peeling off, plaster falling off walls, ‘blown’ plaster
  • Internal plaster stained

What Causes Penetrating Damp?

  • Flower beds, lawns, paths, patios and driveways being raised above the
    installed damp proof course against the external wall.
  • Defective Rain water goods such as guttering that allow water to
    penetrate the walls.
  • Faults in the brickwork or masonry such as missing or cracked pointing.
  • Porous bricks or stones.
  • Roof defects such as faulty flashing, cracked or missing slates or tiles.
  • Missing or defective mastic around windows and doors allowing moisture
    to penetrate.

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