THE REMEDIAL BUILDERS P/L | BUILD-SURETY

Roof Remedial & Waterproofing

Fast Quotes & Easy Comparison for Strata Managers & Homeowners

0Client Details

Full Name

Mobile Number

Email Address

1Roof Type & Size

Construction Type

Approx. Size

m²

2Recommended Solution

Scope of Work

Waterproofing Layer

3Condition Assessment

Concrete Cancer / Exposed Rusty Metal Structural Repair: $4,500 base

Bubbling paint / Stains on ceiling below

White salty powder (Efflorescence)

4Site Setup & Credits

New Steel Edge Capping ($65/Lm)

✅ Site Accessibility Credit (-5%) Next to driveway or flat ground access

Scaffold Access (Height Safety) $2,250 Base + $85/Lm

Scaffold Perimeter (Meters)

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

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

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.

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.

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.

Stage 4 – Final Water Testing & Inspection

After curing, the roof was water-tested to confirm full waterproof performance before final approval.

Stop the Drip: The Hidden Science of Concrete Roof Failure.

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Assessment Summary