Damp Proofing trade jargon

Jargon by trade
Air brick

A perforated brick that is built into a wall to increase ventilation.

Chemical damp-proof course

A form of damp-proof barrier formed by injecting or diffusing a liquid or semi-liquid mixture into a wall.


Water droplets which form on cold surfaces - like walls and window panes - when warm damp air comes into contact with them.

Damp proof course

A layer of impermeable material that stops moisture rising from the ground into a building's walls. 

Typically layed at aleast 2 brick courses above ground level. Commonly referred to as DPC.

Damp proof membrane

A waterproof layer which stops moisture rising through a sub-floor such as concrete.

Often referred to as DPM.


A machine which removes excess moisture from the atmosphere.

Dry rot

A wood rot - caused by the basidiomycete fungus - which typically affects damp timber and causes it to darken and crack into 'cubes'.

Lateral moisture penetration

Water which enters a structure through a side wall.

Rising damp

Moisture which enters a house by rising from the earth and through the lower parts of the structure.

Wet rot

Rot occuring as a result of direct moisture or damp, which can occur both indoors and outdoors.

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