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Solutions — Small Roof Repairs

Fix & Seal Common Roof Problems

Small roof problems become big, expensive ones if they are left alone. Cracks, rust, failing flashings and moss are the most common culprits. Explore the roof below to find the right product to fix each one.

Tap a problem area on the roof to explore

Zone

Product Name

Product description goes here.

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Why It Matters

Fix It Before It Spreads

Most major roof failures start out small — a hairline crack, a spot of surface rust, a lifted flashing, or a patch of moss holding moisture against the surface. Left alone, each of these lets water in, and water is what turns a ten-minute fix into a full roof replacement. Catching and sealing these problems early is the single most cost-effective thing you can do for your roof.

Our repair products are made for exactly these jobs. Formulated and manufactured in New Zealand, they're designed to treat the problem at the source — converting rust, killing moss, bridging cracks, and sealing flashings — then lock it all in with a flexible, UV-stable finish that lasts. Most are straightforward enough for a confident DIYer to apply.

Use the interactive roof above to find the right product for each problem, or browse the full range below. Not sure what you're dealing with? Our technical team is happy to help you identify the issue and choose the right fix.

Two Ways to Repair

DIY or Professional

Small repairs can be tackled yourself, or specified for an approved applicator on larger or more critical jobs.

DIY Repair

S400 + GeoFabric

For cracks, splits, joins and seams, S400 reinforced with GeoFabric is the DIY-friendly repair system. Bed the GeoFabric into a base coat of S400 over the problem area, then build up further coats so it's fully encapsulated and watertight.

S400 GeoFabric

Professional Repair

EcoSeal + GeoFabric

For larger or more critical repairs, an approved applicator can specify EcoSeal reinforced with GeoFabric — installed correctly to deliver a professional, longer-term result. Find an approved applicator for your job.

EcoSeal GeoFabric

The Full Range

Roof Repair Products

Everything you need to fix common roof problems — from treating the cause to sealing the surface.

Anti-Cribbing Fence Paint

Waterproof detailing tape for seams, penetrations and quick repairs. Strong adhesive, flexible enough to move with the structure, and fast...

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GeoFabric Tape

Flexible reinforcement fabric for waterproofing joints, cracks and movement areas. Bridges cracks, absorbs substrate movement, and integrates straight into your...

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Muckoff Organic Moss & Mould Killer

Organic treatment that strips moss, mould, algae and dirt from roofs and exterior surfaces. Biodegradable, safe on most substrates, and...

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S300 – Roof Coating System

Premium high-build roof coating that restores aged roofs and locks in long-term waterproof protection. Bonds firmly, resists UV fade, and...

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S400 – High-Build Waterproof Coating

High-build flexible waterproof coating with up to 600% elongation and serious weather resistance. Bridges cracks, moves with the substrate, and...

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Rust Converter

Stabilises and converts surface rust before you coat, stopping corrosion spreading underneath. Improves topcoat adhesion and brushes on easily. The...

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Super Etch Primer

High-performance adhesion primer for the surfaces standard primers can't hold. Bonds to galvanised steel, Zincalume, stainless and weathered coatings —...

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20m² Waterproofing DIY Kit

Double the coating for medium-sized jobs. Two 4L buckets of S400, self-adhesive tape, brushes and roller sleeves — covers up...

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10m² Waterproofing DIY Kit

Everything you need to seal and protect small areas, in one box. Muckoff cleaner, 4L of S400 coating, self-adhesive tape,...

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The System

How to Apply the System

A lasting roof repair follows four stages. Skipping any one of them is the most common reason repairs fail early.

Clean

Treat and remove moss, mould and algae with MuckOff, then wash back to a clean, sound, contaminant-free surface.

Treat Rust

Treat any rust spots with Rust Converter to stabilise corrosion and prime the surface for coating.

Reinforce

Bed GeoFabric into a base coat over cracks, splits, joins and flashings, then encapsulate it in further coats.

Coat

Finish with the flexible waterproof coating for a durable, UV-stable, watertight repair.

Common Questions

Roof Repair FAQs

Many small repairs are well within reach of a confident DIYer. For cracks, splits, joins and seams, S400 reinforced with GeoFabric is a straightforward DIY repair — clean the area, treat any rust or moss, bed the GeoFabric into a base coat of S400, then build up further coats to encapsulate it. For larger or more critical jobs, or where you'd rather it was specified and installed professionally, an approved applicator can carry out the repair with EcoSeal. Always take care working at height and follow each product's Technical Data Sheet.

Leaks usually trace back to a few common culprits: cracks and splits in the surface, rust breaking through, lifted or failed flashings, and moss holding moisture against the roof. Start by inspecting these points — the interactive roof above shows where they typically occur. If you can't pinpoint the source, or the leak is widespread, get in touch and we'll help you work out the cause.

A repair lasts longest when the cause is treated properly and the surface is well prepared — rust stabilised, moss removed, cracks reinforced, and the coating built up in full. How long it holds depends on that prep, the number of coats, and the conditions the roof is exposed to, so periodic inspection and a re-coat where needed keeps it working. Because DIY application isn't something we can verify, DIY-applied products carry your statutory rights under the Consumer Guarantees Act 1993 but not a performance warranty. For a warranted outcome, the work should be carried out by an approved applicator — see our warranty page for details.

Yes — this step is essential. Coating straight over active rust or living moss means the problem keeps spreading underneath, and the coating lifts as it does. Kill and remove moss, mould and algae with MuckOff, and stabilise any rust with Rust Converter, before you seal and coat. Treating the cause first is the difference between a repair that lasts and one that fails within a season.

Need a hand?

Not sure what you need?

Describe the problem and our technical team will recommend the right products to fix it properly.

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