A damp proof course ( DPC ) is a physical barrier inserted into the fabric of a building to stop water passing from one place to another. This can be on a horizontal plane, stopping water rising up from the ground by being sucked up by the dry masonry above, or vertically to stop water passing from the outside of a building, though the masonry, to the inside. DPC's have taken many forms through the ages and one of the earliest forms was to use a layer of slate in the construction. Slate is still used but the less expensive plastic version ( below right ) is now more widely used.
Malthoid is a 2 ply felt material impregnated with bitumen which is also covered in a fine sand to prevent sticking when rolled. Malthoid is used for waterproofing of flat roofs and under corrugated iron water tanks, to prevent condensation corrosion.
For prevention of rising moisture up through walls of brickwork etc.,