Different types of damp need different treatments so getting the type right is vital
Most people do not realise, that when they notice a 'damp problem', it could be any one of six different sorts of damp, or some combination of the six. As the different types of damp all need different cures, there is no magic single cure for all damp.
The following table outlines some of the key features of the different types of damp.
|Type of Damp||Features|
|Condensation - Damp from the air||
Caused by warm air containing water vapour being cooled. The air can either be cooled on contact with a cooler surface, or lose heat in cooler surroundings. As the air cools, it can no longer hold as much water vapour and any excess leaves the air as water droplets.
|Rising Damp - Damp from the ground directly below the house||
Caused by moisture from the ground rising up through continuous fine pores in floors or walls. The moisture will continue to rise until it can evaporate, or the supply of fresh moisture runs out, or the width of the pores will no longer allow it to continue (they may be too wide or too narrow).
|Penetrating Damp - Damp from rain, or damp from ground against walls||
Caused either by the lack of an escape route for moisture entering the structure, or an increase in moisture that overloads the escape route.
|Chemical Damp - Damp from salt contamination||
Caused by contamination of the plaster with hygroscopic salts. The salts absorb moisture direct from the air. Contamination can have occurred when the house was built, or have happened at any time since for a variety of reasons.
|Damp from plumbing leaks||
Caused either by corrosion of the plumbing, or joints that were not fully watertight when new. Corrosion can be internal as result of more than type of metal being used in the plumbing, or external – often as a result of concrete or cement coming into contact with copper pipes.
|Damp from walls and floors drying out||
Caused by moisture deep within the structure working its way out. This can take many months or even years to dry fully. Hot air driers only dry out moisture close to the surface, so when switched off, moisture deeper in still needs to make its way out.
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