Where Should a Damp Proof Course Be Installed?

Where Should a Damp Proof Course Be Installed? Where Should a Damp Proof Course Be Installed?
Welcome to the Countrywide Insulation blog! Today, we're diving into a fundamental aspect of building construction and maintenance: the placement of damp-proof courses (DPCs). A crucial component in preventing moisture ingress and rising damp, understanding where to install a DPC is essential for protecting your property against damp-related issues. Join us as we explore the optimal locations for DPC installation and why proper placement is critical for ensuring the longevity and integrity of your building.

What is a Damp Proof Course (DPC)?

Before delving into its placement, let's briefly recap a DPC. A damp-proof course is a horizontal barrier typically installed within the walls of a building to prevent moisture from rising through the masonry via capillary action. DPCs are commonly made of slate, bitumen felt, lead, or engineered plastics and are positioned strategically to block the upward movement of moisture.

Where Should a Damp Proof Course Be Installed?

  1. Above Ground Level: DPCs should be installed above ground level to intercept any moisture attempting to rise through the walls. Typically, DPCs are situated approximately 150mm (6 inches) above external ground level to provide a sufficient barrier against rising dampness.
  2. At Foundation Level: DPCs are commonly installed at the base of external walls, forming a continuous barrier between the masonry and the ground. This prevents groundwater or surface water from seeping into the walls and causing dampness.
  3. Around Openings and Joints: DPCs should also be installed around openings such as doors, windows, and vents, as well as at junctions between different building materials. These vulnerable areas are potential entry points for moisture and require effective damp proofing to maintain their integrity.
  4. In Cavity Walls: DPCs are installed horizontally within the cavity for buildings with cavity walls to prevent moisture transfer between the inner and outer walls. This ensures that dampness does not penetrate the internal wall surfaces, preserving the indoor environment.

Why Proper Placement is Crucial:

  • Prevents Rising Damp: Correctly positioned DPCs to intercept moisture attempting to rise through the walls, preventing the onset of rising dampness and associated structural damage.
  • Preserve Structural Integrity: By blocking moisture ingress, properly installed DPCs protect structural elements such as timber, plaster, and brickwork from decay, rot, and deterioration.
  • Maintains Indoor Comfort: Effective damp proofing ensures a dry and healthy indoor environment by preventing mould growth, musty odours, and associated health hazards.


In conclusion, placing damp-proof courses is critical for effective moisture control and building protection. By installing DPC above ground level, at foundation level, around openings, and within cavity walls, you can safeguard your property against rising damp and moisture-related issues.

At Countrywide Insulation, we specialize in providing comprehensive damp-proofing solutions tailored to meet the unique needs of each property. Whether you're constructing a new building or retrofitting existing structures, our experienced team is here to help you ensure your property's long-term integrity and durability.

If you have any questions about DPC installation or damp proofing in general, don't hesitate to contact us. We're dedicated to providing expert advice and personalized solutions to address your dampness concerns.

Thank you for reading! Stay tuned for more informative content from Countrywide Insulation.

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