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CLASS 3/4 COMPLIANT
NEGATIVE PRESSURE SEAL
PVC SHEET MEMBRANE
MEMBRANE LIVE

Seal Forever. Live Rates.

Specialist liquid and PVC sheet membrane applications. From Class 3 internal wet areas to Class 4 external balconies and planter boxes. Compare live 2026 bidding for certified protection.

START WATERPROOFING QUOTE
Internal Wet Area Class 3 Bathroom
Live $ Room Rates
Structural Fix Negative Pressure Seal
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High Exposure Class 4 Balcony
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2 Waterproofing Basement / Roof

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Remedial Builders
VERIFIED Waterproofer

1 Waterproofing Basement

VERIFIED Waterproofer

Remedial Builders

Service Area & Location Welby st Eastwood 2122
Waterproofing Tile work concrete cancer
Cement render, Paint, Concrete, Retaining wall, Fence
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$1,120 Total
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Waterproofing & Sealing

Basement Negative Pressure Waterproofing & Crystalline Slurry

Deep penetrating active crystalline capillary waterproofing system applied to negative-side subgrade basement walls to arrest rising damp and active water ingress.

Wall Area: 40 Sqm
$95.00/Sqm +GST $3,800 Total
Waterproofing & Sealing

High-Performance Liquid Waterproofing Membrane Systems

Multi-layer reinforced polyurethane and polyurea liquid-applied seamless waterproofing membranes engineered for balconies, podiums, and wet areas.

Membrane Area: 50 Sqm
$85.00/Sqm +GST $4,250 Total
Waterproofing & Sealing

Structural Joint Sealing Systems & Expansion Joints

Installation of heavy-duty polyurethane elastomeric sealants, backer rods, and preformed movement joint profiles for dynamic facade and slab joints.

Joint Length: 30 Linear Metre
$48.00/Linear Metre +GST $1,440 Total
Concrete Cancer & Cracks

Concrete Cancer Remediation & Spalling Repair

Breaking out spalled concrete, abrasive blast cleaning of corroded reinforcing steel, applying anti-corrosion zinc primer, and reinstating with high-strength structural repair mortar.

Repair Area: 15 Sqm
$260.00/Sqm +GST $3,900 Total
Concrete Cancer & Cracks

Structural Crack Injection & Movement Stitching

Low-viscosity structural epoxy pressure injection for static concrete cracks and polyurethane foam injection for active water-leaking structural cracks.

Crack Run: 25 Linear Metre
$65.00/Linear Metre +GST $1,625 Total
Retaining & Subgrade

Retaining Wall Waterproofing & Subsoil Drainage

Application of heavy-duty bituminous or rubberized waterproofing membranes to retaining walls coupled with slotted ag-lines, geocomposite drainage cell, and filter fabric.

Retaining Area: 35 Sqm
$110.00/Sqm +GST $3,850 Total
Waterproofing & Sealing

Cavity Flashing & Brickwork Damp-Proof Course (DPC) Remediation

Retrofitting flexible copper or PVC cavity flashings and weep holes into existing brickwork to eliminate rising damp and water pooling inside wall cavities.

Flashing Run: 20 Linear Metre
$140.00/Linear Metre +GST $2,800 Total
Concrete Cancer & Cracks

Structural Carbon Fibre Plate & Wrap Reinforcement

High-tensile carbon fibre reinforced polymer (CFRP) structural strengthening systems epoxy-bonded to slabs, beams, and columns for load capacity upgrades.

Carbon Wrap Area: 10 Sqm
$320.00/Sqm +GST $3,200 Total
Retaining & Subgrade

Subfloor Ventilation Fans & Automated Moisture Control Systems

Supply and installation of continuous-rated commercial subfloor extraction fans, humidistat controllers, and core-drilled subfloor brick vents to eradicate mould and damp.

Ventilation Units: 2 Unit
$850.00/Unit +GST $1,700 Total
Waterproofing & Sealing

Balcony Remedial Overhaul, Screeding & Waterproofing

Complete strip-out of failed balcony tiles and screed, diamond grinding, substrate repairs, fall screeding, class-3 waterproof membrane, and new tile adhesive bedding.

Balcony Area: 25 Sqm
$185.00/Sqm +GST $4,625 Total
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Est. Subtotal (+GST) $0
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OUR BEST OFFER

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# Best Most Popular Work
Low Pitch Colorbond Metal Roofing
METAL ROOF #01
ID: #TRB-ROOF-LPCB01
LOW PITCH | COLORBOND METAL

Low Pitch Colorbond Steel Roof

Strong Australian sheet steel made for gentle roof slopes. Prevents water pooling and protects your home against leaks.

180mΒ² LIVE PACKAGE $24,352.94 ($135.29/mΒ²) $20,700.00 ($115.00/mΒ²)
SAVE 15% +GST
What is included: New steel sheets, water shield layer, and heavy timber support battens.
What is excluded: Fixing rotten timber frame underneath.
*Standard terms apply.
# Best Most Popular Work
Low Pitch Concrete Tile Roofing
TILE ROOF #02
ID: #TRB-ROOF-LPCT02
LOW PITCH | CONCRETE TILES

Low Pitch Concrete Tile Roof

Classic thick concrete tiles with an extra waterproof layer underneath. Specially built to stop rain driving under tiles on low slopes.

180mΒ² LIVE PACKAGE $29,223.53 ($162.35/mΒ²) $24,840.00 ($138.00/mΒ²)
SAVE 15% +GST
What is included: Concrete roof tiles, sealed waterproof paper, ridge caps, and concrete pointing.
What is excluded: Old hazardous asbestos removal underneath.
*Standard terms apply.

*This offer is currently available through our email marketing. Promotional rates exclude difficult site access or non-standard materials and are subject to final inspection.

VERIFIED COSTS & LOCATIONS
RECENT WORK
REAL PRICING

RECENT JOBS & PROJECTS

2 featured major projects and 5 recent builds with costs, locations, and reviews.

The Remedial Builders

Last Projects

Roofing & Leaks

Roof Leak Patching & Valley Sealing

Quickly located and sealed heavy storm leaks around chimney flashings and valley irons to stop water entering the ceiling.

Total Cost $930
Eastwood
Roof Maintenance

Tile Replacement & Ridge Capping Fix

Replaced broken roof tiles, re-pointed loose ridge caps, and cleared clogged gutters to protect the home during rain.

Total Cost $1,160
Epping
Carpentry

Door Frame & Architrave Repairs

Realigned sticking exterior doors, replaced water-damaged timber architraves, and installed fresh weather seals.

Total Cost $1,360
Ryde
Boundary Work

Timber Fence Repair & Post Reset

Straightened leaning fence posts with fresh concrete footings and replaced rotted pine palings along the side boundary.

Total Cost $2,125
Parramatta
Roof Edge Repair

Fascia Board Timber Replacement

Replaced damaged roof timber fascia boards with treated timber backing to prepare for new gutter installations.

Total Cost $2,850
Baulkham Hills
Drainage Systems

Colorbond Gutter & Downpipe Replacement

Removed old rusty gutters and fitted high-capacity Colorbond guttering with custom PVC downpipe connections.

Total Cost $2,975
Strathfield
Exterior Wash

Roof Pressure Cleaning & Moss Removal

High-pressure washed heavy moss and dirt build-up off concrete roof tiles, restoring clean street appeal.

Total Cost $3,000
Chatswood
Balcony Sealing

Balcony Grout & Membrane Resealing

Removed worn balcony floor grout, applied polyurethane perimeter seals, and clear-sealed tiles to prevent leaks.

Total Cost $3,600
Hornsby
Strata Planter Box Waterproofing and Drainage System
STRATA FEATURE #01
ID: #TRB-WP-CS1
STRATA & MULTI-RESIDENTIAL | PLANTER BOX REMEDIAL

Strata Planter Box Waterproofing & Drainage System

Full removal of existing soil, plant roots, and failed membrane. We install a tough double-coat waterproof membrane, continuous drainage cell system, root barrier, and refill with clean soil on a 5m x 1m planter box.

FULL SCOPE OF WORK (5m x 1m PLANTER BOX)
  • Soil Removal & Bagging: Excavate all existing soil, clean out old roots, and separate site access safely.
  • Surface Prep & Repair: High-pressure clean, concrete patch repair, and install new perimeter fillets.
  • Waterproof Membrane: 2-coat heavy-duty polyurethane membrane with anti-root protection.
  • Drainage & Soil Refill: Install drainage sheet, protection board, geofabric layer, and re-fill clean soil.
COMPLETE PLANTER BOX REMEDIAL COST $13,200.00 $11,000.00 (Starting Price)
SAVE 15% SPECIAL +GST INCLUDED AT CHECKOUT
Important Terms: Includes soil digging, membrane coating, drainage cells, and access protection. Excludes: Major structural concrete rebuilds & mature tree crane lifting. *Site inspection required. T&Cs apply.
Basement Parking Area Crack Injection Waterproofing
REMEDIAL SPECIAL #02
ID: #TRB-WP-CS2
COMMERCIAL & STRATA CARPARK | NEGATIVE PRESSURE INJECTION

Basement Carpark Wall & Ceiling Injection Repair

Stop active underground water leaks in basement parking walls and ceilings. High-pressure polyurethane resin injection seals deep concrete cracks, followed by negative side waterproofing render to keep the carpark dry.

FULL SCOPE OF WORK (BASEMENT WATERPROOFING)
  • Crack Preparation: V-cut leaking cracks along basement walls and overhead concrete ceiling joints.
  • Polyurethane Injection: Drill injection ports and pump flexible PU resin to fill deep concrete voids.
  • Negative Waterproofing: Apply high-strength negative pressure slurry coating to stop moisture ingress.
  • Protective Finish: Smooth plaster render touch-up and final protective seal coat.
COMPLETE BASEMENT INJECTION COST $17,400.00 $14,500.00 (Package Estimate)
SAVE 15% SPECIAL +GST INCLUDED AT CHECKOUT
Important Terms: Includes high-pressure resin injection, port installation, and negative membrane application. Excludes: Major structural steel rebar replacement. *Site inspection required. T&Cs apply.
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The Remedial Builders P/L

LIC: Builder 283896C β€’ ABN 34 160 847 736

Mobilisation $550.00
01 Select Core Remedial Package (Save 15%)
A. Structural & Waterproofing Bundles
SAVE 15%

Concrete Cancer & Spalling

Breakout, rebar treatment & structural mortar.

$161.50 /mΒ² (+GST) $190
SAVE 15%

Balcony Waterproofing

Multi-layer polyurethane membrane & testing.

$85.00 /mΒ² (+GST) $100
SAVE 15%

Structural Epoxy Crack Injection

High-pressure epoxy resin bonding.

$93.50 /lm (+GST) $110
SAVE 15%

External Wall Crack Stitching

Helical bar reinforcement & grout bonding.

$76.50 /lm (+GST) $90
02 Additional Repair & Protective Services
Service Task & Specification
Service Task & Specification Promo Rate Area / Qty
Polyurethane Water Leak Injection (Basements & Retaining Walls)
High-pressure PU foam injection to stop active water ingress through joints and porous concrete. 		$110.50
SAVE 15%
External Wall Control Joint Sealing & Silicone Replacement
Removal of degraded sealant, backing rod installation and high-grade polyurethane joint sealant. 		$38.25
SAVE 15%
Anti-Carbonation Protective Facade Coating
Breathable elastomeric membrane coating preventing CO2 ingress and future concrete spalling. 		$29.75
SAVE 10%
Access scaffold tower
Aluminumn mobile tower at max 10m height in single tower (2 weeks rate). 		$2,750
SAVE 10%
Material + Site setup allowance
Min 5-rate each project cover; Projecting, Site clean... 		$700
SAVE 10%
03 Professional Guarantee & Compliance
Licensed Builder Structural & Waterproofing Compliance
Structural engineering compliance checks, defect reports & $20M Public Liability Insurance.
Included
04 Client & Site Details
Notice & Safety

You contract directly with the trade business (Build-Surety is not a party). Plus, never share ID or payments onlineβ€”we will never ask.

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Frequently asked questions

Clear, honest answers for builders, strata, and property owners.

REMEDIAL BUILDER SOLUTIONS

Balcony Waterproofing FAQs (8 Key Answers)

Technical, compliance, and execution answers designed specifically for remedial building contractors and strata managers.

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01 COMPLIANCE

Which Australian Standard governs remedial balcony waterproofing?

All external above-ground balcony works are governed by AS 4654.1 (materials) and AS 4654.2 (installation). AS 3740 is for internal wet areas only.

02 DIAGNOSTICS

How do you handle sub-slab water migration in existing structures?

We perform flood testing and core analysis. Existing screeds are inspected for efflorescence and concrete cancer requiring repair before new membrane bonding.

03 SLOPE & FALLS

What is the minimum fall required for balcony drainage reinstatement?

AS 4654.2 mandates a minimum fall ratio of 1:100. On flat slabs, we install engineered polymer-modified screeds to establish correct falls before membrane application.

04 MEMBRANES

Which membrane types are best for active structural movement?

We specify Class III high-extensibility liquid polyurethane or dual-layer torch-on sheet membranes capable of accommodating building joint expansion and movement.

05 DETAILED FLASHING

How do you terminate membranes at door tracks and hob junctions?

Membranes require a minimum 100mm upturn behind door tracks and perimeters, supported by pressure bars, neutral sealants, and mechanical flashings.

06 QUALITY CONTROL

Is mandatory flood testing conducted prior to tiling or screeding?

Yes. We execute a 24-to-48-hour static flood test or electronic vector mapping to verify absolute watertight integrity prior to laying finishes.

07 SUBSTRATES

Can new waterproofing be applied over existing failed tiles?

For remedial builder standards, full strip-outs down to sound concrete are recommended to clear trapped moisture and prevent secondary adhesion failure.

08 CERTIFICATION

What documentation is provided upon completion of works?

We issue a formal Certificate of Compliance (AS 4654) backed by statutory warranty guarantees and complete QA photo logs.

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Hazardous Tree Removal Operations
πŸ“ NSW Inner West
πŸ“ž 0433 379 576

Sam's Royal tile

A. Certified Subfloor and Wall Waterproofing
πŸ“ NSW Inner West
πŸ“ž 0433 379 576

TRB - Brick wall structural remedial repair solutions

All Brick wall structural remedial repair solutions.
πŸ“ NSW Northern Beaches
πŸ“ž 0433 379 576

Building inspecting TRB

Expert real estate property inspections
πŸ“ NSW Parramatta
πŸ“ž Andy 0433 379 56

Carpentry & Joineries TRB

Expert structural framing subfloor construction.
πŸ“ NSW Parramatta
πŸ“ž Andy 0433 379 576

GREY ROCK CONCRETE

Expert residential decorative concrete driveways.
πŸ“ NSW Central Coast
πŸ“ž Liam Blue, +61 3 3456 7890

retail shopfitting, commercial office partitions TRB

Professional retail shopfitting commercial joinery.
πŸ“ VIC Melbourne
πŸ“ž Mark Silver, +61 7 1234 5678
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