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DPC Injection for Rising Damp

What is a DPC?​

A DPC (Damp-Proof Course) is a horizontal barrier within a wall that prevents ground moisture from rising upward through masonry by capillary action.

In older buildings, a DPC may:

  • Be missing entirely
  • Have broken down over time
  • Sit below current ground or floor levels
  • Be bridged by render, plaster, or external works
 

When a DPC is absent or ineffective, moisture is able to rise through the wall fabric.

Rising Damp Graphic
DPC Injection Location

What DPC Injection Does​

DPC injection is a method of creating a new damp-proof course inside an existing wall by introducing a chemical barrier at a specific horizontal plane.
 
Rather than inserting a physical membrane, a chemical injection system forms a water-repellent zone within the masonry itself. This zone functions as the new DPC and interrupts upward moisture movement.

What Determines Whether It Works

A chemical DPC only performs as intended when:

  • The barrier is continuous across the wall thickness
  • The injection line is correctly positioned
  • Drill depth and spacing match wall construction
  • The chemical can distribute through the pore network
 

Discontinuity at any point undermines performance.

View the Silonexx injection fluid specification and supply options.
Silonexx DPC Injection product
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