Case - study

Concrete Roof Waterproofing (Sydney NSW) 2025

Intro — Problem & Root Cause
A strata building in Sydney had repeated roof leaks affecting top-floor units. Previous patch repairs didn’t last. Our inspection showed cracks, ponding water, and a failed membrane coating. The root cause was no flexible waterproofing layer and poor drainage setup.

Ave Cost: $120 per m²
“Liquid-membrane waterproofing (2-layer system) — depending on condition, preparation need and complexity.”
Warrantly
6 years
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Work done

  • Cut open cracked areas and repaired them
  • Treated weakened concrete
  • Rebuilt low spots to improve water flow

Key point: All repairs were bonded securely to the existing concrete.
Report: We sent before/after photos showing cracks, repairs, and surface prep.

Work done: Applied a full waterproofing system

  • Primer/base coat
  • Flexible membrane
  • UV-protected top coat for durability

Testing: A flood test confirmed the roof was fully watertight.
Report: Owners received photos of each waterproofing layer and test results.

Work done:

  • Applied smooth finishing coat
  • Sealed all roof penetrations (pipes, vents, drains)
  • Added flexible joints at high-movement areas

Reporting Summary: Throughout all stages we provided:
Clear photo updates / Progress reports / Critical inspection checks / Product and compliance details

Case - study

Roof Waterproofing with Torch-On Bitumen Membrane

The client was experiencing ongoing roof leaks after heavy rain. Previous patch repairs failed repeatedly. We installed a new torch-on waterproofing membrane system over the prepared surface to permanently stop water entry.

Why We Use Torch-On Bitumen Membrane

  • Heavy-Duty & Long-Lasting – Designed for harsh weather
  • Excellent UV Resistance – Protects from sun damage
  • Fully Waterproof & Seam-Sealed – No weak joints
  • Flexible with Building Movement – Reduces cracking
  • Low Maintenance – Long service life
  • Ideal for Flat & Low-Slope Roofs
Ave Cost 145 per m²
(depending on condition and complexity)
Warrantly
15–25+ years
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Stage 1 – Crack Repairs & Surface Preparation
The roof surface was cleaned and fully prepared to ensure strong membrane bonding.
💡 Value: Prevents future membrane lifting and early failure.
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Stage 2 – Priming the Roof Surface
Purpose: Create a strong bonding layerA bitumen primer was applied to the full roof area to improve membrane adhesion and seal the concrete surface.
💡 Value: Increases membrane lifespan and prevents air bubbles.
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Stage 3 – 2-Layer Torch-On Membrane Installation
System: Base layer + Cap sheet (UV protected) / All seams were fully welded for maximum waterproof protection.
💡 Value: Dual-layer system gives maximum waterproof safety and durability.
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Stage 4 – Final Water Testing & Inspection
After curing, the roof was water-tested to confirm full waterproof performance before final approval.
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Avoid Costly Repairs —

1. Fix the Root Cause, Not the Symptoms
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🛠️ Our Preventive Approach: We repair the real issue so leaks don’t return.
💡Cost Saving: Prevents future water ingress, saves on rework, and protects interior finishes.

2. Correct Waterproofing Sequencing
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Cost Saving: We install the right membrane layers and test them before covering.

3. Inspect Critical Stages Before Covering
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Our Preventive Approach:
Every major step is checked before moving to the next.

With the team who diagnose, manage, and deliver your project. Our transparent process means you’re informed every step of the way — from defect analysis to handover and warranty.

01

Regular photo progress updates

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Clear cost breakdowns

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Direct access to your project manager

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Full compliance documentation

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Work Directly with the Experts

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Team Members
Site research plan

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Cost-Effective Solution
Recommended approach balancing quality and budget.

Water penetration or Structural issue

$250+GST 

RISK-FREE RESEARCH: Your site inspection fee is fully CREDITED BACK to you when the project contract is signed. 

Category A:
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In-depth site-investigation;

comparative quote for the defined scope.

Detailed Scope of Work

Alternative Solution: Suggestion for a viable alternative if applicable (e.g., phased repair vs. full replacement).

On-Site Session:
- Time Management Planning & Risk Mitigation
- Scheduling & Project Protection Review

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Detailed Defect Report:

$750+GST

Analysis of issues and clear, expert solutions.

Category B
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Complex Assessment: Inspection of multiple units, common property, and complex strata defects.

Vertical Access Included:
Roofs and Balconies
requiring ladder access (up to 7M/two stories).

Concealed Spaces: Comprehensive review of Basements, Sub-floors, and confined areas.

Separate Quote: Provides an independent, comparative quote for the defined scope.

Clarity on Inspection & Report
FAQ
Service area: "Northern Sydney, the Inner West, and Greater Parramatta." more
1. What does Structural Access cover?
2. How do you perform leak and water testing?
3. When is a Structural Engineer required?
4. How quickly will I get my report?
5. Can I use this report for insurance claims?
6. Does the cost cover complex testing like jackhammering?
Our Promise

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