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Adamp-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 DPC is usually a thick plastic strip bedded into the mortar between two courses of bricks or blocks. It can often be seen as a thin plastic line in the mortar near ground level.
Materials usually used as Damp Proof Course in walls are:
Hot bitumen
Plastic sheets
Bituminous felts
Sheets of lead
Copper, etc.
Damp Proof Course in Buildings