A damp-proof course (often abbreviated to DPC) is a horizontal barrier in a wall designed to prevent moisture rising through the structure by capillary action - a phenomenon known as rising damp. This technique has been used since ancient times. The Romans used a horizontal course of slate inserted in a wall to act as an impervious barrier. Building standards in many countries require most new buildings to incorporate a DPC at the time of construction.

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  • A damp-proof course (often abbreviated to DPC) is a horizontal barrier in a wall designed to prevent moisture rising through the structure by capillary action - a phenomenon known as rising damp. This technique has been used since ancient times. The Romans used a horizontal course of slate inserted in a wall to act as an impervious barrier. Building standards in many countries require most new buildings to incorporate a DPC at the time of construction. This may consist of a thin strip of plastic, a course of engineering brick or slate, or a layer of bitumen. Where a DPC is absent or inadequate, there are various means of retrospectively fitting one. A common method in masonry walls is to drill holes into the wall at regular intervals and inject a penetrating chemical into the holes. The chemical is absorbed into the masonry where it dries to form a waterproof barrier. Some irregular stone walls cannot be drilled for a chemical DPC, so an osmotic electrical system is often fitted. Alternatively the cement joints can be drilled and the chemical injected there instead, although this is a less satisfactory method. A larger volume of chemical will be needed. Some forms of the chemical are odour free, some have a strong odour, this should be taken into account when purchasing. A Damp Proof Membrane (DPM) performs a similar function for a solid floor.
  • Eine Horizontalsperre hindert Bodenfeuchtigkeit daran, im Mauerwerk kapillar aufzusteigen. In Neubauten wird standardmäßig eine Horizontalsperre eingebaut, in älteren Bauwerken ist sie jedoch häufig undicht oder gar nicht vorhanden.
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  • July 2009
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  • Talk:Damp proofing Merger proposal
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  • A damp-proof course (often abbreviated to DPC) is a horizontal barrier in a wall designed to prevent moisture rising through the structure by capillary action - a phenomenon known as rising damp. This technique has been used since ancient times. The Romans used a horizontal course of slate inserted in a wall to act as an impervious barrier. Building standards in many countries require most new buildings to incorporate a DPC at the time of construction.
  • Eine Horizontalsperre hindert Bodenfeuchtigkeit daran, im Mauerwerk kapillar aufzusteigen. In Neubauten wird standardmäßig eine Horizontalsperre eingebaut, in älteren Bauwerken ist sie jedoch häufig undicht oder gar nicht vorhanden.
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  • Damp-proof course
  • Horizontalsperre
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