Rain penetration (better known as penetrating damp) is a common form of dampness in buildings.
It can occur through walls, roofs or openings such as window reveals. Water will often enter the outer envelope of a building and travel inside.
Common caused of penetrating damp include:
- Roof defects such as faulty flashing, cracked or missing slates or tiles.
- Faults in brickwork or masonry, cracked pointing, porous bricks etc.
- Missing or defective mastic around windows and doors.
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