Damp (structural) - Rain Penetration

Rain Penetration

Rain Penetration (also known as "penetrating damp") is a common form of dampness in buildings. It can occur through walls, roofs, or through openings (e.g. window reveals).

Water will often penetrate the outer envelope of a building and appear inside. Common defects include:

  • Roof defects such as faulty flashing, cracked or missing slates or tiles.
  • Faults in the brickwork or masonry such as missing or cracked pointing. Porous bricks or stones.
  • Missing or defective mastic around windows and doors.
  • Blocked weep holes.
  • Missing or defective trays in cavity walls.

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    Chinese proverb.