Damp-proof course
Damp-proof course (DPC): a waterproof barrier built into masonry walls to stop moisture rising from the ground. Required under NCC Housing Provisions 5.7.3 and 5.7.4.
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A damp-proof course (DPC) is a continuous waterproof barrier built into a masonry wall to stop moisture from migrating upward from the ground (rising damp) into the wall structure and internal linings. DPCs are installed at the base of external masonry walls, typically at the first or second course level, and must be positioned at least 150 mm above adjacent ground level (75 mm above sloped paved areas). The material must comply with AS/NZS 2904 or the Housing Provisions 5.7.3 list (embossed black polyethylene 0.5 mm nominal, polyethylene-coated aluminium sheet, or bitumen-impregnated material 2.5 mm thick minimum).
The DPC must extend the full width of the masonry leaf and remain visible externally after render or paint is applied. A buried or plastered-over DPC cannot be inspected for continuity and is a common defect finding in NSW Building Commission site campaigns. Weep holes are formed in the course immediately above the DPC to drain any moisture that accumulates at the barrier.
Also known as: DPC, damp proof course.
Category: Masonry / waterproofing.
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Last updated: 2026-05-08. Verified: 2026-05-08.