A damp proof course (DPC) is a barrier installed in the walls of a building to prevent moisture from rising through the structure. It is typically made of materials like plastic, bitumen, or slate and is placed at least 150 mm above ground level. This helps protect the interior from dampness, which can lead to mold and structural damage. The DPC is an essential part of construction, especially in areas with high groundwater levels. Proper installation ensures that the building remains dry and comfortable, contributing to the longevity of the structure and the health of its occupants. Regular inspections can help maintain its effectiveness over time.