Corrosion Protection

No Replacement Needed

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Metal Roof Leak Repair & Waterproofing

Metal roofs are durable, but over time they are exposed to weathering, corrosion, failed fixings, and joint movement — leading to leaks and loss of waterproof integrity. We provide professional metal roof waterproofing and restoration, sealing leaks and treating corrosion with seamless liquid-applied systems — without unnecessary roof replacement.

Long-Term Protection Corrosion-resistant coating

No Roof Replacement Repair existing metal roof

Free Metal Roof Inspection No-obligation assessment

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Professional metal roof waterproofing treatment in progress

Completed corrosion treatment on metal roof showing seamless protective coating

Rust and corrosion damage on metal roof panels requiring treatment — Corrosion damage

Lava20 waterproofing coating applied to metal roof edge — Lava20 coating detail

Professional applying cut-edge corrosion treatment on metal roof — Cut-edge treatment

Metal roof with completed Lava20 waterproofing treatment — Completed waterproofing

Metal Roof Problems

Why Metal Roofs Commonly Develop Leaks

Metal roofs are constantly affected by thermal expansion and contraction, exposure to rain and UV radiation, and long-term weathering. Over time, this leads to:

Movement at joints and overlaps — thermal cycling forces metal sheets apart
Loosening or corrosion of fixings — screws and bolts degrade over time
Breakdown of original coatings — factory finishes wear thin with age
Rust formation on exposed metal — once coating fails, corrosion spreads quickly

These issues often result in persistent leaks and ongoing maintenance, especially on older metal roof systems. Rather than replacing the entire roof, professional waterproofing and restoration can extend the life of existing metal roofs when the structure remains viable.

What We Do

Metal Roof Waterproofing & Corrosion Treatment

We specialise in metal roof waterproofing and restoration, focusing on the most common failure points found on metal roof systems — cut-edge corrosion, joints, seams, and fixings.

Effective metal roof waterproofing is not just about applying a coating. Correct preparation and detailing are critical, particularly where corrosion is present at cut metal edges. Our service includes:

Thorough roof cleaning — surface preparation to remove debris and contaminants
Cut-edge corrosion treatment — rust converter neutralises existing corrosion
Compatible primer application — ensures strong adhesion to metal surfaces
Masking and detailing — preparation of movement areas and critical transitions
Bond breaker tape installation — at critical transitions to allow movement
Multiple layers of liquid waterproofing — seamless membrane across the roof
Protective top coating — seals and protects the entire system

Cut-edge corrosion is treated using a layered approach: corrosion is neutralised first, then primed, reinforced, waterproofed, and finally sealed with a protective resin. By addressing corrosion and detailing before full waterproofing is applied, we restore the roof's waterproof integrity and deliver a durable, long-term solution.

Watch: Cut-edge corrosion treatment process

Watch: Metal roof waterproofing process

Step-by-Step Process

Our 4-Step Metal Roof Waterproofing Process

Each metal roof is assessed individually to ensure the correct preparation and system specification, designed to stop leaks, treat corrosion, and deliver lasting protection.

Cleaning & Surface Preparation

The roof is thoroughly cleaned to remove dirt, contaminants, and loose corrosion, followed by a full inspection of the metal surface to assess condition and identify problem areas.

Proper surface preparation is the foundation of any lasting waterproofing system — coatings only bond effectively to clean, sound substrates.

Corrosion Treatment & Repairs

All rusted and exposed metal is treated and stabilised. Failed fixings, seams, and joints are repaired and reinforced to restore structural integrity before waterproofing.

Treating corrosion before waterproofing prevents rust from spreading beneath the coating — a common failure point in inferior repairs.

Priming & Detailing

A specialist primer is applied to ensure strong adhesion of the waterproofing membrane. Additional detailing is carried out at seams, fixings, and movement areas for reinforced protection.

Correct priming and detailing at transitions ensures the waterproofing membrane maintains full adhesion under thermal movement.

Waterproofing System Application

The liquid-applied waterproofing membrane is installed across the roof surface, forming a seamless, fully bonded protective coating that eliminates leak paths.

The finished membrane forms a continuous, flexible barrier — protecting against leaks, UV damage, and further corrosion for years to come.

Key Benefits

Why Waterproof a Metal Roof?

Metal roof waterproofing is not just about stopping visible leaks — it's about stabilising the roof system, controlling corrosion, and protecting vulnerable details before failure escalates.

Stops leaks at critical points — seams, overlaps, fixings, and cut edges are sealed and reinforced
Controls and neutralises corrosion — cut-edge corrosion is treated before waterproofing, preventing rust from spreading beneath the system
Seamless, fully bonded protection — liquid-applied membranes form a continuous waterproof layer with no joints
Designed for metal roof movement — the system remains flexible, allowing for thermal expansion and contraction
Extends roof lifespan without replacement — existing metal roofs are restored and protected, delaying costly replacement
Reduces ongoing maintenance — by addressing corrosion and detailing properly, future call-outs are significantly reduced
Cost-effective long-term solution — waterproofing delivers durable performance at a fraction of the cost of full replacement

By combining corrosion treatment, detailed preparation, and a layered waterproofing system, metal roof waterproofing provides reliable, long-term protection for aging and leaking metal roof structures.

Cut-edge corrosion damage on metal roof requiring treatment — Cut-edge corrosion

Metal roof partially waterproofed showing before and after difference — Half waterproofed

Metal roof with completed waterproofing and protective top coat — Waterproofed & top coated

Fully waterproofed metal roof with seamless protective membrane — Completed waterproofing

Get in Touch

Arrange a Free Metal Roof Inspection

If your metal roof is leaking, corroded, or showing signs of age, early intervention can prevent further deterioration and costly repairs.

What you can expect:

Free roof inspection and assessment
Fast site visit availability
Clear, no-obligation quotation
Detailed proposal with the recommended solution

Contact us today to arrange a free metal roof inspection and protect your building with a proven waterproofing solution.

Call Now 087 44 96 938 Book Free Inspection

Metal Roof Leak Repair & Waterproofing

Why Metal Roofs Commonly Develop Leaks

Metal Roof Waterproofing & Corrosion Treatment