A Damp Proof Course (DPC) is installed by laying it on a full, even bed of fresh mortar in one continuous length for the entire width of the wall leaf.
Here's a breakdown of the installation process:
- Mortar Bed: A fresh, even bed of mortar is essential. This provides a level surface for the DPC to sit on and ensures full contact.
- Continuous Length: The DPC should run in one continuous length to avoid weak points where moisture could penetrate.
- Full Width Coverage: The DPC must cover the full width of the wall leaf to prevent rising damp from bypassing it.
- Overlap: At any joints or corners, provide at least a 100mm overlap. This ensures a watertight seal and prevents moisture from seeping through the connection.
- Cavity Obstruction: The DPC must not obstruct the cavity. Proper installation ensures it's positioned correctly and doesn't compromise the cavity's ability to ventilate and prevent moisture transfer.
- Visibility: The external edge of the DPC should be visible. When pointing the mortar joint, avoid bridging the DPC with mortar. Bridging can create a pathway for moisture to bypass the DPC.
In Summary: Proper DPC installation involves careful attention to detail, ensuring a continuous, fully supported, and correctly positioned barrier against rising damp.
