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2026 FLUSH FINISH GUARANTEE
BASEMENT WATERPROOFING Waterproofing Basement

Negative Pressure Basement Ingress Fix

  • Localised Slurry Application from $1,450 +GST
  • High-Strength Waterproof Render from $160 +GST /m2
LIVE RATE FROM
$ 1450 +GST
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2026 FLUSH FINISH GUARANTEE
BASEMENT WATERPROOFING Waterproofing Basement

Strata Underground Parking Render Shield

  • Hydrophobic Crack Injection Repair from $1,850 +GST (To halt active high-pressure water streams)
  • Complete Multi-Layer Basement Overhaul from $14,900 +GST ( Underground structural protection)
LIVE RATE FROM
$ 160 +GST
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DIRECT LINE

Andy Kim

0433 379 576

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The Remedial Builders P/L

LIC: Builder 283896C • ABN 34 160 847 736

Est. Base $550.00
01 Site Location & Asset Profile
02 Select Recovery Bundle
BEST FOR SEEPAGE

NEGATIVE SIDE SEAL

Crystalline Slurry + Reinforced Membrane + 10Y Warranty.

+$13,600/Pkg
ULTIMATE PROTECTION

DRY-VAULT RECOVERY

Resin Injection + Internal Drainage + Crystalline Coating.

+$25,750/Pkg
03 Select Service Packages (Engineered Solutions)
Hydrophilic Resin Injection
High-pressure crack sealing to block active groundwater ingress.
$5,800.00
Crystalline Membrane System
Deep penetration waterproofing for concrete matrix protection.
$7,200.00
Internal Drainage Channel
Sub-floor channel setup for hydrostatic pressure management.
$3,900.00
Site Prep & Surface Grinding
Mechanical grinding and efflorescence removal for bond prep.
$2,450.00
04 Client Confirmation
2026 PROPERTY OWNER PROTECTION

Basement Water Leaks

Simple answers to stopping underground leaks, managing wet basement air, and fixing flooded carparks.

01 What is an internal water barrier and how does it stop basement leaks?

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.

THE REMEDIAL FIX: We seal your walls from the inside out using an advanced Hydrostatic Barrier. This locks out moisture completely and stops heavy underground water pressure from creating puddles on your floor.

02 Why does my basement feel so humid and smell musty?

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.

THE REMEDIAL FIX: We install custom air flow paths and Atmospheric Control systems. This continuously pulls out the damp, trapped underground air and replaces it with fresh, dry air so mold cannot grow.

03 How do you stop heavy water leaks from ruining concrete carparks?

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.

THE REMEDIAL FIX: We use an industrial-strength Carpark Encapsulation process. This adds an ultra-thick waterproof barrier to your walls, turning leaking concrete into a dry, completely safe parking area.

04 Why do underground leaks need an official engineering plan?

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 REMEDIAL FIX: We design custom blueprints for Structural Protection. This gives your repair team clear directions to protect your foundations, keep the property dry, and meet all strict 2026 building laws.

PROJECT CASE STUDY: BASEMENT DRY-OUT SITE SECURED & VERIFIED

Sub-Floor Concrete Wall Water Ingress Recovery

TYPE: Negative Pressure Waterproofing
AREA: Sub-Level Foundation Walls
WARRANTY: 10-Year Performance

01. THE PROBLEM (CUSTOMER PAIN)

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.

02. OUR PERMANENT SOLUTION

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.

  • High-Pressure Resin Injection.
  • Crystalline Slurry Application.
  • Structural Joint Sealing.
  • Efflorescence Removal.
Basement Injection Work

03. CLEAR COST BREAKDOWN

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
Note: PRINT E-QUOTE (Save to PDF)
Trade Visual

Waterproofer in all area

Epping
$125 /m²
VERIFIED
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Remedial Paint

Chatswood
$165 /m²
VERIFIED
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Concrete Driveway / Slab work

Epping
$460 /m²
VERIFIED
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DIAGNOSTIC TERMINAL

Chatswood
$155 /m²
VERIFIED