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Basement remediation: High-pressure negative side systems
High-build negative pressure cementitious membrane application for subsurface wall moisture control.
Integrated Efflock admixture for pore-blocking with a full polymer-modified render restoration system.
Forensic epoxy/polyurethane crack injection to seal overhead structural fissures and prevent leaks.
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LIC: Builder 283896C • ABN 34 160 847 736
Crystalline Slurry + Reinforced Membrane + 10Y Warranty.
Cementitious Membrane + Efflock Admixture + Render Shield.
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Render with Efflock Additive Waterproof plaster mix to stop salt damp and white powder stains. |
$65.00/m
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Base Prime & New Paint Work Anti-mould sealer coat plus premium internal low-VOC finish paint. |
$110.00/m²
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Negative Pressure Crack Seal Deep epoxy injection joint fix before membrane application. |
$185.00/m
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Surface Grinding & Salt Cleaning Heavy duty floor/wall prep to clean dirty bricks for maximum bond. |
$45.00/m²
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Estimated Total
Simple answers to stopping underground leaks, managing wet basement air, and fixing flooded carparks.
When your basement wall sits directly on a boundary line or under an existing building, digging up the earth outside to fix a leak from the exterior is impossible. Instead, we have to stop the water from the inside. We apply special heavy-duty coatings (often called negative-pressure membranes) directly to your inside walls. This tough shield blocks the wet soil outside from pushing dampness or liquid water through your brick or concrete.
Basements naturally trap heavy, stagnant air because they are underground. When warm air meets the naturally cold surface of a concrete basement floor or wall, it creates hidden sweat and condensation. This constant moisture turns your space into a breeding ground for toxic mold and bad smells. Simply wiping down the walls won't fix it; you have to physically change the air flow to stop moisture from settling.
Active leaks in multi-level carparks do more than create puddles—they eat away at the concrete structure and carry harsh minerals that can permanently ruin car paint. To solve this, we don't use weak paints. We apply thick, structurally reinforced cement layers blended with special crystals. These crystals mix with the leaking water inside the concrete, growing tightly together to physically block the water paths from deep within the wall.
Quick, small patches never last underground because water will always find the next weakest spot in your wall. To keep a basement permanently dry, you need a complete strategy that works with your building's foundations. An expert plan maps out exactly where the water is moving, where to place drainage channels under the floor, and how automatic pump systems will safely guide the water away from your home.
The basement was suffering from constant flooding during heavy rain. Water was forcing its way through the concrete cold joints and structural cracks, damaging stored goods and creating a high risk of Concrete Cancer. Previous "waterproof paints" had peeled off, failing to stop the high-pressure groundwater pushing from the outside in.
We utilized a "Negative Side" engineering approach. Instead of digging up the exterior, we injected high-performance hydrophilic resins into the cracks to block water at the source. We then applied a crystalline slurry and a reinforced cementitious membrane to the entire wall surface, turning the basement into a dry, usable vault.
| WORK ITEM | TOTAL INVESTMENT |
|---|---|
| Site Prep & Surface Grinding | $2,450.00 |
| Hydrophilic Resin Injection (Linear) | $5,800.00 |
| Crystalline Membrane System | $7,200.00 |
| Negative Pressure Coating | $6,400.00 |
| Internal Drainage Channel Setup | $3,900.00 |
| FINAL PROJECT TOTAL | $25,750.00 |
The basement is now a 100% dry environment, protected by a 10-year workmanship warranty. By addressing the Hydrostatic Pressure with professional-grade injections rather than surface patches, we have extended the life of the building's foundation and eliminated the risk of mould and structural decay. The property is now compliant with Australian Standards for habitable below-ground spaces.
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