Polythene Dampcourse

Polythene Dampcourse

What Is Dampcourse?

Dampcourse (also called damp-proof course or DPC) is a protective barrier installed in walls to stop moisture from rising up from the ground. It’s usually made from durable materials such as polyethylene, bitumen, or stainless steel.
Its main job is to prevent water from travelling through masonry by capillary action—protecting the structure and internal finishes from damp, mould, and long-term damage.

Where Is Dampcourse Used?

Dampcourse is typically installed:

• At the base of external and internal walls—just above ground level.
• Between brickwork and timber framing to prevent moisture transfer.
• Under sill plates and bottom plates in framed construction.
• Above openings (windows and doors) as a flashing to guide moisture out.
• In retaining walls to block moisture entering habitable areas.
• In cavity walls as part of the moisture management system.

Benefits of Using Dampcourse

• Prevents Rising Damp: Stops ground moisture from travelling into the building structure.
• Protects Structural Integrity: Reduces the risk of rot, decay, and deterioration in timbers and masonry.
• Improves Indoor Air Quality: Minimises mould, mildew, and musty odours caused by moisture ingress.
• Extends Building Lifespan: Acts as a long-term barrier that supports the overall durability of the home.
• Cost-Effective Protection: A relatively small investment that prevents significant future repair costs.
• Complies With Building Standards: Essential for meeting Australian construction requirements (e.g., NCC moisture management provisions).