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.