CONCRETE ROOF WATERPROOFING Waterproofing Concrete-roof

Major Multi-Layer Membrane Overhaul

Minor Joint Resealing from $850
Structural Crack Injection from $1,450

LIVE RATE FROM

$ 1450 +GST

QUICK ENQUIRY

CONCRETE ROOF WATERPROOFING Building Movement Repair Sydney

Minor Roof Joint Seal

Full Roof Protective Membrane $4,800 +GST
Structural Crack Injection from $1,450

LIVE RATE FROM

$ 850 +GST

QUICK ENQUIRY

DIRECT LINE

Andy Kim

0433 379 576

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BASE SYSTEM

ID: #ROOF-01

SURFACE | CEMENTITIOUS

Cementitious Seal

Mineral-based crystalline coating designed to penetrate and seal concrete pores against moisture.

$ 185 +GST / base = 1m2

PRO-RECOMMENDED

ID: #ROOF-02

ELASTIC | POLYURETHANE

Pro Liquid Membrane

High-elasticity liquid polyurethane membrane for seamless, UV-resistant, long-term protection.

$ 320 +GST / base = 1m2

PREMIUM

ID: #ROOF-03

HEAVY-DUTY | TANKING

Structural Tanking

Reinforced torch-on bituminous system for high-traffic concrete roofs and flat-roof decks.

$ 540 +GST / base = 1m2

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SYSTEM READY | VERIFIED 2026

Get Your Live Estimate Now

LIC: Builder 283896C • ABN 34 160 847 736

Est. Base $550.00

01 Site Location & Asset Profile

PROJECT ADDRESS

STRUCTURE TYPE

02 Roof Waterproofing Selection (10m² Base)

LIQUID MEMBRANE

PU Modified Hybrid System

2-Coat UV Stable + Detail Mesh. Commercial Grade. 10Y Warranty.

$8,500 +GST

PREMIUM SHEET

Torch-on Bitumen (Dual)

Base + Granulated Cap Sheet. High Traffic Resistance. 15Y Warranty.

$12,800 +GST

03 Additional Remedial Services

	PARAPET WALL & UPTURN Vertical waterproofing termination to perimeter walls.	$95.00/m²
	PONDING & FALL CORRECTION Cement screed to ensure correct drainage flow.	$110.00/m²
	SCUPPER & OUTLET UPGRADE High-flow drainage outlets with leaf guards.	$1,350.00/Pkg

04 Client Confirmation

$0.00

Project Area Multiplier (10m² Base)

Multiplier

Total Area: 10.0 m²

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2026 PROPERTY OWNER PROTECTION

Concrete Roof Waterproofing

Simple answers to flat roof leaks, pooling water, and keeping your building permanently dry.

01 Why do flat concrete roofs always seem to leak?

Flat concrete roofs expand when the sun beats down on them and shrink when they cool down at night. If your roof has an old, brittle waterproofing layer, this constant thermal movement cracks the seal. Rainwater then pools on the flat surface and finds its way through these cracks directly into the rooms below.

THE REMEDIAL FIX: We grind away old, failed membranes and apply a thick, industrial-grade liquid polyurethane shield. This seamless layer acts like a tough rubber sheet that stretches and contracts with the weather without ever splitting.

AVOID LEAK RECURRENCE

STOP REPEAT FAILURES

Most flat roof leaks return because of poor prep work. We only use Licensed Remedial Waterproofers to meet strict AS4654 Standards, protecting your building from structural decay.

02 How do we fix pooling water issues on the roof?

When a concrete roof is perfectly flat or starts to sag over time, rain water cannot find the drains. This "ponding" water sits on the roof for days, slowly eating through general house paints and weak sealants until it drips through your ceiling plasterboards.

THE REMEDIAL FIX: Before sealing, we install engineered Screed Fall Lines. We build up a slight, precise slope on the roof floor so all rainwater flows naturally and immediately straight into the drainage grates.

TOTAL PEACE OF MIND

NO HIDDEN SURPRISES

Worried about a "quick fix" failing? Our scope includes a comprehensive surface profile preparation and a mandatory 24H Flood Test. We prove the roof is 100% watertight before completing the job.

03 Can a roof leak cause hidden concrete cancer?

Yes, ignoring a roof leak is highly dangerous for the whole building. When water continuously sinks into the concrete slab, it travels deep enough to reach the structural steel reinforcing bars inside. Once that internal steel rusts and expands, it will blow the concrete roof apart from the inside out.

THE REMEDIAL FIX: We treat the slab with deep-penetrating water repellents and lay a high-performance, UV-stable top coating. This blocks water and salt air from ever touching your building's structural core.

GUARANTEED PROTECTION

STRUCTURAL SECURITY

Don't risk your property investment with casual trades. Every concrete roofing project is backed by a 6-Year Workmanship Warranty and verified Remedial Building Licenses.

Case Study:
Strata Concrete Roof & DBP Compliance

Category: Strata Concrete Roof Waterproofing | NSW DBP Act Registered Work

The Challenge

A strata building was stuck in a loop of cheap roof patches. Old, rotting waterproof sheets were trapping water underneath them, eating into the main concrete slab and causing expensive leaks into the top apartments.

Under the strict NSW Design and Building Practitioners (DBP) Act, strata roofs are classified as critical elements. Any repair requires fully compliant engineering designs, a registered practitioner, and official declarations to protect the building's insurance and legal standing.

DBP Compliant Roof Strategy

1. Declared Engineering Design

Lodged certified, legal building designs on the NSW Planning Portal to satisfy all DBP Act structural regulations before starting work.

2. Deep Strip & Concrete Cure

Completely stripped away old, failed membranes down to raw concrete, repairing concrete cancer zones on the roof deck.

3. High-Fall Water Protection

Laid a new sloped mortar bed to guide water directly into roof drains, combined with heavy-duty multi-layer waterproofing sheets.

REGULATED STRATA WORK ITEM	COST BREAKDOWN
DBP Act Regulated Engineering Design & NSW Portal Filing	$4,800.00
Safe High-Rise Scaffolding & Protection Mesh (Setup/Remove)	$2,200.00
Failed Membrane Scraping & Rubbish Removal	$8,500.00
Certified Dual Torch-on Membrane Base & Top Sheets	$12,800.00
TOTAL REGULATED ESTIMATE	$30,600.00

"Following the DBP Act saves strata plans from future court fines and protects owners. Doing the waterproofing right the first time guarantees a leak-free roof for over 15 years."

— 2026 Compliance Verification

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Major Multi-Layer Membrane Overhaul

Minor Roof Joint Seal