Sydney Based + National Delivery
Sydney Based + National Delivery
The drilling pattern determines whether the injected chemical can form a continuous damp-proof course across the wall thickness.
Incorrect spacing or depth leaves untreated pathways where moisture can continue to rise.
DPC injection is usually carried out directly into the masonry units.
In sandstone construction, injection is commonly performed into the mortar joints rather than the stone itself. Sandstone is often dense and may not accept injection readily, while the mortar provides a more reliable path for distribution.
Where mortar is used, it must be sound and continuous. Repointing may be required before injection to ensure the treatment is effective.
Hole spacing is selected to ensure overlap of the treated zones within the masonry.
Typical considerations:
Spacing must account for wall material, thickness, and pore structure.
In areas where appearance matters, such as front elevations or entrances, drilling into the mortar joints around the bricks (sides and base) is preferred to avoid visible damage to the masonry while still achieving effective damp control.
Drilling too shallow is a common cause of failure.
Drilling too far will lead to loss of product into cavities.
The main focus when injecting is to get full saturation of the desired injection line. Sometimes modification of angles is needed to accomodate for hard to access locations.
Drilling patterns must be adjusted for:
No single pattern suits all wall types.
Method selection and drilling pattern are linked.
These errors commonly result in a discontinuous barrier.
*Injection fluid will continue to saturate and expand from the point of injection for around 24 hours after termination of injection. Proper judgements of injection saturation should be done after 24 hours.