Sydney Based + National Delivery
Sydney Based + National Delivery
A DPC (Damp-Proof Course) is a horizontal barrier within a wall that prevents ground moisture from rising upward through masonry by capillary action.
Chemical DPC injection introduces a specialised fluid into masonry to create a damp-proof course internally. The goal is to interrupt rising moisture by forming a water-repellent zone within the wall’s pore network.
Unlike a physical damp-proof membrane, the chemical acts within the mortar and masonry pores to alter how moisture moves.
Moisture rises in masonry through capillary suction — water is drawn upward through tiny pores and gaps in the wall material.
A chemical DPC works by:
• Reducing the surface tension of moisture pathways
• Causing moisture to resist entering treated pores
• Forcing moisture to stop rising once it reaches the treated zone
For this to work, the chemical must penetrate far enough into the wall to cover the capillary pathways continuously.
After injection:
This process is physical and chemical, not just surface waterproofing.
Penetration isn’t automatic. It depends on:
Wall material and density
Dense or very fine pore structures resist fluid spread.
Moisture and salt load
High moisture or salts can block uptake.
Void distribution
Voids and rubble can channel fluid unpredictably.
Drill depth and spacing
If holes don’t reach the masonry core or are too far apart, untreated zones remain.
Chemical systems come in two main formats:
Injection Fluids
Injection Creams
The choice impacts penetration and continuity.
A new DPC must be unbroken across the wall thickness.
Discontinuity means moisture finds untreated pathways and continues rising.
• Continuity requires:
• Correct injection plane
• Even distribution
• Adequate penetration
• Wall-specific methodology