15+ Year Protection

Leak-Free Guarantee

Free Inspection

Valley Leak Repair & Waterproofing

Leaking roof valley causing water damage? Our specialist team delivers permanent leak repairs for commercial and residential roof valleys using liquid rubber waterproofing. No scaffolding, no disruption — completed quickly with a written guarantee.

15+ Year Protection Flexible waterproof coating

No Scaffolding Required Direct application method

Free Valley Inspection No-obligation assessment

Call Now 087 44 96 938 Get Free Quote

Completed liquid rubber coating on metal roof valley showing seamless finish

Valley Waterproofing

Why Do Roof Valleys Leak?

Roof valleys are one of the most vulnerable points on any roof. They channel rainwater from multiple roof slopes into a single concentrated flow — and when they fail, water finds its way directly into your home.

The most common causes of valley leaks include:

Rust and corrosion in metal valleys
Cracked or deteriorated lead flashing
Debris accumulation blocking water flow
Poor original installation or incorrect overlap
Age-related wear from constant water exposure

Our Valley Repair Process

As shown in the video, our systematic approach addresses the root cause of valley leaks — not just the symptoms:

1
Rust Treatment Any corroded or rusty elements are treated with Brunox rust converter. This chemically neutralises the rust and prepares the surface for waterproofing.
2
Priming We apply LAVA Super Quick Primer to ensure maximum adhesion between the existing surface and the waterproofing layer.
3
LAVA Waterproofing The liquid rubber waterproofing agent is applied — forming a seamless, flexible membrane that bonds directly to the valley surface.
4
Protective Top Coat A dark UV-resistant top coat is applied for additional protection against weathering and to provide a clean, professional finish.

This multi-layer system moves with your roof through temperature changes, eliminating the cracking and separation that causes traditional repairs to fail. The result: 15+ years of reliable, leak-free protection.

What We Do

How We Treat Metal Roof Valleys

Metal valleys require specialised treatment to stop leaks permanently. Our approach addresses the unique challenges of metal surfaces — rust, thermal movement, and poor adhesion.

Our metal valley treatment process includes:

Surface Preparation — cleaning and degreasing to remove contaminants
Rust Conversion — Brunox treatment neutralises existing corrosion
Metal Primer — LAVA Super Quick Primer bonds to metal surfaces
Liquid Rubber Application — flexible membrane that expands and contracts
UV-Resistant Top Coat — protects against weathering and sun damage

The key advantage of our system: the liquid rubber membrane remains flexible after curing. This means it moves with your metal valley as temperatures change — eliminating the cracking that causes traditional repairs to fail within 2-3 years.

Watch: Our valley waterproofing process in action

Step-by-Step Process

Our 5-Step Valley Waterproofing Process

Our valley repair and waterproofing works follow a structured, systematic process, designed to eliminate leaks, treat corrosion, and provide lasting protection without unnecessary disruption.

Valley Inspection & Assessment

We begin with a thorough inspection of your roof valleys, identifying rust, corrosion, cracks, and potential leak points. This assessment determines the exact treatment required.

Many valley leaks are caused by hidden damage that isn't visible from ground level — our inspection identifies issues before they become major problems.

Surface Cleaning & Preparation

The valley is carefully cleaned to remove dirt, moss, debris, and loose material. For metal valleys, we use low-pressure cleaning to avoid damaging the surface.

Proper surface preparation is critical — waterproofing systems only bond effectively to clean, dry surfaces.

Rust Treatment & Priming

Any rusted or corroded areas are treated with Brunox rust converter, which chemically neutralises the rust. Once treated, we apply LAVA Super Quick Primer for optimal adhesion.

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

LAVA Liquid Rubber Application

The liquid rubber waterproofing is applied in multiple coats, building up a seamless, flexible membrane that bonds directly to the valley surface and surrounding roof materials.

The LAVA system remains flexible after curing — it expands and contracts with temperature changes, eliminating the cracking that causes traditional repairs to fail.

Protective Top Coat & Inspection

A UV-resistant top coat is applied for additional protection against weathering and sun damage. We then conduct a final inspection to ensure complete coverage.

The finished valley is fully waterproof, protected against UV degradation, and backed by our 15+ year guarantee.

Key Benefits

Why This Valley Waterproofing System Works

Roof valley leaks are rarely caused by a single defect. As shown in the video, failure usually results from a combination of cracked PVC linings, untreated cut-edge corrosion, and movement at joints and transitions. Simply coating over these issues leads to premature failure.

Our valley waterproofing method is designed to treat the causes of failure before waterproofing begins, ensuring long-term performance. Key benefits include:

Corrosion is treated at source Exposed and cut metal edges are treated with a rust converter before any coating is applied, preventing corrosion from continuing beneath the waterproofing system.
Cracked PVC valleys are fully reconditioned Cracks and splits are repaired using PU mastics, primers, reinforcement tapes, and mesh — restoring the integrity of the valley lining.
Movement areas are reinforced Bond breaker tapes and flexible detailing allow the system to accommodate movement without cracking or splitting.
Multi-layer system for durability The waterproofing is built up in layers — primer, waterproofing membrane, and protective top coat — creating a tough, seamless lining designed for constant water flow.
Prevents blistering and bubbling Correct surface preparation and corrosion treatment eliminate the risk of coating failure caused by trapped rust or moisture.
Extends the service life of existing valleys Valleys are restored and protected rather than replaced, delivering long-term performance with reduced disruption and cost.

This system does not simply mask leaks — it reconditions and waterproofs roof valleys properly, delivering a durable solution for high-risk drainage areas on commercial roofs.

Watch: Valley corrosion and why proper treatment matters

Warranty & Peace of Mind

Long-Term Protection for Commercial Roof Valleys

All valley waterproofing works are carried out by trained specialists and backed by a company-backed workmanship warranty.

Reliable Long-Term Leak Protection

Our waterproofing system is designed to provide lasting protection against leaks, even in Ireland's demanding weather conditions.

Your valleys remain watertight for years to come, eliminating recurring leak issues.

Reduced Future Repair Costs

By addressing the root causes of valley failure — not just the symptoms — we help you avoid expensive emergency repairs down the line.

One proper treatment now saves multiple repairs later.

Corrosion & Cracks Treated Correctly

Every repair follows our systematic treatment process — rust conversion, crack repair, priming, and multi-layer waterproofing.

No shortcuts. No temporary fixes. Just proper, professional workmanship.

Protection During Heavy Rainfall

Roof valleys handle concentrated water flow from multiple roof slopes. Our system is designed for constant water exposure and heavy rainfall events.

Peace of mind when the weather turns — your valleys are protected.

Get in Touch

Arrange a Free Valley Leak Inspection

If your roof valleys are leaking, cracked or showing signs of corrosion, early intervention can prevent widespread roof failure.

What you can expect:

Free inspection and assessment
Fast site visit availability
Clear, no-obligation quotation
Detailed proposal outlining the recommended repair system

Call Now 087 44 96 938 Book Free Inspection

Valley Leak Repair & Waterproofing