Dampness in buildings can cause an increase in moisture content of timber and ultimately produce conditions suitable for the development of fungal decay. Excessive dampness in buildings can cause many other problems. Most insulation can be rendered ineffective when it becomes wet; plaster and decorations become spoilt; mortar and brickwork deteriorate; electrical short circuiting can occur; unhygienic conditions and mold growth can develop.

Dampness will increase the level of humidity in the building and contribute to condensation problems. Excessive dryness can be as unacceptable as excessive damp. There are many possible causes of dampness in buildings; defects in the roof, walls and plumbing can cause penetrating dampness, and faults in damp proof courses at ground level can permit rising damp to occur. The life style of the occupants and the amount of heating, ventilation and insulation can influence the development of condensation.

Any surveyor carrying out a diagnosis of causes of dampness in buildings must be aware of all possible sources of damp and their effects, so that correct and appropriate remedial measures will be carried out.

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