Penetrating damp is moisture that soaks in through the walls from pretty much anywhere except the ground. The common cause of penetrating damp is some type of defect with the building such as blocked water drainage pipes or a missing roof tile.
Preventing penetrative damp
Most of the time once the cause of the damp I.E the missing roof tile is rectified the damp problem will vanish although this depends on the exact cause of the penetrating damp. It may be that further action is required such as silicon-based water repellent emulsions if the damp is coming directly through the wall.
Particular areas to check include:
- Roof gutters and drain pipes
- Damaged or cracked walls
- Roofs and tiles
- Window sills and frames