A damp-proof course (DPC) is a layer or barrier used in building construction to prevent moisture from rising through walls or floors. It is usually located at the base of walls or below the floor level and is made of materials that are resistant to water, such as plastic, bitumen, or slate.
DPCs can be installed during the construction of a building or retrofitted to an existing structure. The purpose of a DPC is to prevent dampness from rising up through the walls, which can cause damage to the structure and promote the growth of mold and mildew.
In a typical brick or masonry wall, a DPC will usually be a layer of waterproof material installed at the base of the wall, between the internal and external leafs of the wall. This barrier prevents moisture from seeping up through the foundations and into the walls. In some cases, a DPC may be necessary at higher levels of the wall if there is a risk of moisture penetrating the wall from the outside.
Overall, the use of a damp-proof course is an important aspect of building construction, as it helps to protect the structure from potentially harmful moisture damage.
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