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What is penetrating damp

Penetrating damp is generally taken to refer to water passing through the structure of a building from outside and is associated with a building defect. Common causes include leaking guttering, running overflow pipes and porous brickwork. Penetrating damp often creates dampness on internal surfaces that provides a strong clue as to the cause. Moss growth on external brickwork is also an indication of a potential penetrating damp problem.

The term penetrating damp is also used more broadly to include internal defects such as plumbing leaks and dampness affecting earth-retaining walls.

External dampness Corresponding internal dampness

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