Basement waterproofing remediation in Sydney – installation of drainage system and wall lining to prevent water leaks.

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Basement & Negative Waterproofing
Specialised waterproofing solutions applied to the internal face of concrete walls and slabs to stop water ingress where positive-side access is impossible, such as basements, lift pits, and retaining walls.

Basements, underground carparks, and lift pits are constantly exposed to hydrostatic pressure from surrounding soil and groundwater. Over time, this pressure forces water through cracks, joints, and even the pores of concrete. When positive-side (external) access is blocked by soil, neighbouring structures, or property boundaries, negative-side waterproofing becomes the only viable solution.

At Atomic Projects, we use advanced negative-side waterproofing systems to stop leaks from inside — penetrating deep into the substrate to block water pathways and resist pressure from the outside. This is a specialist process requiring precise preparation, correct material selection, and flawless application to achieve long-term success.

Our Basement & Negative Waterproofing Process

  1. Leak Investigation & Assessment
    • Identify all points of ingress — cracks, cold joints, tie holes, honeycombing, and construction joints.
    • Measure hydrostatic pressure and assess soil/drainage conditions to choose the correct system.
  2. Surface Preparation
    • Remove all coatings, laitance, and loose material to expose clean, sound concrete.
    • Open cracks and chase out defective joints to receive repair compounds.
  3. Crack & Joint Sealing
    • Inject epoxy or polyurethane resin for active leaks.
    • Fill cold joints and tie holes with high-performance plugging mortars capable of withstanding high water pressure.
  4. Negative-Side Membrane Application
    • Apply crystalline, cementitious, or epoxy-based coatings that penetrate and seal the substrate.
    • Multiple coats are installed, with curing times strictly adhered to.
  5. Final QA & Monitoring
    • Inspect adhesion, thickness, and coverage.
    • In high-risk areas, install monitoring ports to track moisture levels post-completion.

Common Basement Waterproofing Problems We Solve

  • Constant dampness or pooling water in basements.
  • Rust staining and concrete spalling from reinforcement corrosion.
  • Lift pit flooding.
  • Water seepage through retaining walls.
  • Failed or deteriorated internal waterproof coatings.

Why Atomic Projects for Negative Waterproofing

  • Specialist Capability: Not all waterproofers handle negative-side works — we’ve completed complex basements in high-water-table areas.
  • Material Mastery: We use systems that chemically bond and become integral with the concrete matrix.
  • Minimal Downtime: Rapid-setting compounds and staged works minimise disruption to building operations.
  • Proven Under Pressure: Solutions designed to withstand extreme hydrostatic loads for decades.

Negative waterproofing is a last line of defence — but when executed correctly, it can turn a constantly leaking basement into a dry, usable space for the long term.

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If you’re ready to get started, we're ready to help.

Take the next step and let’s build something that lasts.

 

📞 Call Us: 0410 515 509

✉️ Email Us: hello@atomicprojects.com.au

 

— Ben Tran, General Manager, Atomic Projects

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