Concrete Crack Injection & Leak Repairs Sydney
Water leaking through your basement, concrete wall or construction joint? We use specialist polyurethane crack injection and tailored leak-sealing systems to stop unwanted water at its source — often from inside the structure, without major excavation.
Water Coming Through Concrete?
A leaking basement or persistent concrete crack can quickly turn a valuable space into a constant problem. Our focus is straightforward: identify the water pathway, seal the leak and help return the area to a dry, usable condition.
From running leaks to recurring damp patches, TruBond delivers targeted concrete injection and remedial waterproofing for existing buildings throughout Sydney. We combine practical site experience with specialist repair systems to tackle difficult water ingress.
Specialist Concrete Leak Repair Services
Polyurethane Crack Injection
Injection of appropriate water-reactive or flexible resins into leaking concrete cracks, selected for moisture, movement and water flow.
Basement Wall Leaks
Targeted repairs to cracks and joints in below-ground concrete walls, where outside excavation may be impractical.
Wall-to-Slab Joints
Injection and joint remediation for leaking wall-floor junctions and construction joints under hydrostatic pressure.
Active Water Ingress
Assessment and controlled treatment of running leaks, including temporary water management where needed.
Lift Pits & Service Areas
Remedial leak sealing in confined or difficult-to-access concrete areas, subject to safe access requirements.
Pool & Tank Leaks
Repair options for cracks and joints in water-retaining structures, chosen around finishes, water chemistry and pressure.
Seal the Crack from Within the Concrete
Injection ports are installed along the identified crack or joint. Resin is introduced under controlled pressure so it can penetrate the water pathway. Depending on the formulation, polyurethane may react with water, expand or form a flexible seal.
Every leak is different. For challenging site conditions, we can combine polyurethane injection with joint treatments, crystalline repair systems and other targeted measures to develop a practical, site-specific solution.
Why choose injection?
- Targets cracks and joints within the structure
- Can often be performed from the accessible side
- May avoid disruptive excavation
- Suitable systems can treat active water flow
- Small injection ports can be reinstated after treatment
Our Injection Repair Process
Inspect & Diagnose
Identify likely entry points, crack geometry, water pressure and surrounding concrete condition.
Prepare & Install Ports
Establish safe access, drill injection locations and install packers as appropriate.
Inject & Monitor
Inject a suitable resin at controlled pressure and observe resin travel and water response.
Finish & Review
Remove or trim ports, make good surfaces and review repair performance under available conditions.
Experience with Difficult Active Leaks
Three-Storey Basement — Sutherland Shire
An extensive basement remediation project involving approximately 90 metres of joints and cracks, 35 anchor penetrations, three in-situ cracks and a further 15 metres of wall-to-slab junctions. TruBond used a combination of injection and crystalline repair systems to address multiple water entry points across the structure. Leaks that had previously been running or jetting were reduced to damp or dry conditions across the treated areas.
Aquatic Centre — Five Swimming Pools
Hundreds of individual leak locations were treated across five separate swimming pools at a NSW aquatic centre. The extensive remediation program addressed concrete defects and water pathways across multiple pool structures, achieving watertight conditions before the subsequent waterproofing stage. A major demonstration of TruBond’s capacity to manage large-scale, technically demanding leak remediation.
Concrete Crack Injection FAQs
Can polyurethane injection stop an actively leaking concrete crack?
Yes. Specialist polyurethane resins are designed to penetrate water-bearing cracks and can react with moisture to form a seal, making injection a highly effective option for many active concrete leaks. We select the system to suit the conditions found on site.
Do you need to excavate outside the basement wall?
Often, no. One of the biggest advantages of injection is that many leaking cracks and joints can be treated from the accessible interior face of a basement wall, potentially avoiding disruptive external excavation.
Is injection better than surface waterproofing?
Injection is an excellent way to target the actual water pathway within a crack or joint, rather than simply covering the surface. Where a project calls for broader protection, we can combine injection with complementary waterproofing measures.
Can you inject every leaking balcony or swimming pool?
We repair leaks in concrete pools, tanks, balconies and other structures using methods tailored to the site. Our assessment helps us choose an approach that protects existing finishes and services while targeting the source of water ingress.
How much does concrete crack injection cost?
Every leak is different, but targeted injection can often be a cost-effective alternative to extensive demolition or excavation. Send us photos and details of the affected area and we can discuss the next steps toward a quotation.
Stop Water Ingress Before It Causes More Damage
Take the first step toward a drier, more usable space. Tell us where the water is entering and arrange an inspection to discuss a targeted repair solution.