Complete topping extractions, slab decontamination treatments, concrete cancer repairs, and leveling screed applications for legacy strata subfloors. Compare transparent pricing instantly.
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Magnesite Removal works baseline set to: 10m²
Chipping out old toxic topping layers in a 2-bedroom unit down to standard raw level floor base panels (10m² baseline).
Heavy mechanical grinding to strip out every trace of deeply embedded magnesite materials from concrete pores (10m²).
Options for dust-free grinding to prevent funitures, ceiling, wall all - serface .





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LIC: Builder 283896C • ABN 34 160 847 736
Chipping out old toxic topping layers in a 2-bedroom unit down to standard raw level floor base panels.
Heavy mechanical grinding to strip out every trace of deeply embedded magnesite materials from concrete pores.
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DUST-FREE DIAMOND GRINDING OPTIONAL: Commercial vacuum extraction setup during slab grinding to keep living areas fully clear of dust particles. |
$55.00/m²
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SLAB CONCRETE CANCER REPAIR Chipping loose spalling patches, treating rusted steel mesh bars, and filling with high-strength structural mortar. |
$380.00/m
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STRUCTURAL SLAB CRACK INJECTION High pressure structural liquid epoxy injection inside slab fractures to bond cracked areas back together securely. |
$68.00/m
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Estimated Total
Essential answers regarding chloride risk, concrete cancer prevention, and precision micro-grinding methods.
Magnesite is a wood-flour and magnesium oxychloride cement topping widely laid down as an acoustic leveling underlayment in mid-century apartments. Over time, or when exposed to damp conditions, it releases highly corrosive chloride ions. These chlorides leach directly into the structural slab, aggressively attacking the embedded internal steel reinforcement rods, triggering rapid rust expansion, and causing severe concrete cancer.
Many legacy concrete floor slabs feature a "thin skin" concrete cover, meaning the structural steel mesh sits dangerously high—often within millimeters of the surface. A standard, aggressive mechanical grinding approach will shred these vital structural metal strands. Protecting this framework requires high-resolution concrete scanning and strict physical depth limiters on all grinding gear.
Using heavy ride-on stripping machines or heavy-duty jackhammers sends severe impact vibrations radiating through old concrete, which can easily induce structural cracking in the slab below or blow out ceiling plasterboard in the unit directly underneath yours. Eliminating this risk requires setting aside the heavy plant machinery in favor of controlled, low-impact hand tools.
A comprehensive, compliance-ready subsurface preparation package covers several highly specialized remedial phases. For a standard residential scope, costs split across low-impact stripping, precision micro-grinding, structural engineering mapping, and hazardous dust extraction. A typical structural substrate preparation package executes at a base estimate profile of roughly $4,600.00 total.
Category: 75m² Full Removal & 5mm Mechanical Diamond Grinding | 2026 Structural Update
An expansive 75m² strata apartment floor required complete stripping of hazardous, water-trapping magnesite overlay topping. Over decades, hidden chlorides from the topping had started attacking the underlying structural slab, causing structural floor cracks to form across the living zones.
The primary obstacle was safely clearing the subfloor without hitting high-sitting structural mesh bars. The job demanded a full-area, highly precise 5mm mechanical diamond grind combined with specialized structural crack repairs to stabilize the entire slab foundation safely.
Carefully broke and completely cleared away the entire topping layout layer down to raw concrete substrate across all room sections.
Ran mechanical diamond grinders strictly restricted to a 5mm depth gauge over the whole floor plan to eliminate all residual chloride material.
Chased open all substrate cracks and sealed them using high-strength epoxy compound formulas to permanently fuse the concrete floor back together.
| MAGNESITE CONTROLLED EXTRACTION PACK (OVER 75m²) | ESTIMATE PRICE |
|---|---|
| Full Mechanical Stripping & Bulk Magnesite Topping Uplift (75m² Area) | $5,400.00 |
| Precision Mechanical Floor Diamond Grinding (Strict 5mm Depth Limit Entire Plan) | $4,200.00 |
| Structural Concrete Slab Crack Chasing, Cleaning & Epoxy Compound Injection Repairs | $1,800.00 |
| Chloride Neutralising Chemical Subfloor Scrub & HEPA Dust Extraction Clean | $1,100.00 |
| TOTAL SUBSURFACE PREPARATION ESTIMATE | $12,500.00 |
"Stripping 75m² of old magnesite requires meticulous depth management. Restricting mechanical diamond grinding to 5mm protects shallow reinforcement steel wire, while structural epoxy repairs restore complete strength to the entire concrete slab foundation."
— 2026 Triangle Reference System Audit
Select a Specialist Repair for technical projects or General Trade for standard building works. 2026 Price Verified.