Barriers need to be installed to prevent moisture and toxic gases entering the building.
Damp Proof Membrane An impervious membrane should always be applied as a Damp Proof Membrane above or below a ground floor slab to prevent water ingress into a structure.
Damp Proof Course The DPC known as Damp Proof Course 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. It is designed to prevent moisture rising through the structure by capillary action.