Retaining walls do far more than shape Auckland’s gardens and driveways—they anchor homes, protect public spaces, and keep properties safe. Yet, every year, hundreds of owners face the frustrations of leaks, damp patches, and expensive repairs. In nearly every case, the underlying issue is the same: poor or inadequate waterproofing.

Auckland’s heavy rainfall and thick clay soils mean retaining walls experience relentless hydrostatic pressure—moisture seeking the slightest entry. Unchecked, this leads to:

• Mould and persistent damp
• Efflorescence streaks and mineral deposits
• Swollen, cracked, or bulging walls
• Soil erosion undermining the base
• Council inspection failure and reduced property value

When water invades a retaining wall, the consequences escalate fast:

• Ongoing repair bills and health threats from hidden mould
• Erosion or subsidence around the wall base
• Freeze-thaw cycles and rainfall testing your wall year-round
• Valuation loss and council compliance risks

At Auckland Waterproofing Experts, we refuse generic “quick fixes.” We only trust: Sika Blackseal, Bituthene3000, Viking Torch-on membrane, Nuralite Nuraply torch-on—each product is tried and tested for Auckland’s climate, installed to meet strict NZ Building Code and council requirements.

“Our reputation depends on every wall we waterproof. We only install systems we’d use in our own homes, with technical data sheets to prove it.”


Auckland Waterproofing Experts

Hydrostatic pressure is the invisible adversary—water builds up behind every wall, ready to exploit minuscule gaps or weaknesses. Auckland’s dense clay soils only magnify the risk:

• Efflorescence: white, chalky deposits signal water seepage
• Mould: causes health risks and property damage
• Structural cracking and wall bulging: visible signs of failure
• Base and foundation erosion: threatens the entire structure

Retaining wall waterproofing

• Bitumen-based coating for concrete and blockwork
• Brush-applied for total coverage and adhesion
• Resistant to aggressive soils and hydrostatic pressure
• NZ Building Code certified for below-ground applications

“For challenging underground walls with rough surfaces, Sika Blackseal is our trusted choice. It’s easy to apply, delivers a seamless waterproof barrier, and—when installed correctly—remains reliable for decades. However, it must be protected with an additional layer before backfilling to ensure long-term performance.”

Auckland Waterproofing Experts

• Self-adhesive, cold-applied membrane for complex shapes
• Self-healing to seal small holes and surface imperfections
• Flexibility for uneven or detailed surfaces
• Engineered to resist maximum hydrostatic pressure

“Bituthene3000 bends where other membranes crack. Preparation is the key. When followed by professional installation, it will last for decades without issues.”


Auckland Waterproofing Experts

• Self-adhesive, cold-applied membrane for complex shapes
• Thickness: 1.5mm; roll size: 1m x 20m; temperature range: stable from -30°C to 90°C
• BRANZ-appraised and widely accepted across Auckland builds.
• Durability: 50+ years when properly installed

“Ardex Shelterseal3000X flexes with your retaining wall, protecting where rigid membranes fail. Expert surface preparation paired with Shelterseal’s self-adhesive strength ensures decades of leak-free performance“

Auckland Waterproofing Experts

• Heat-welded seams for full waterproofing
• Multi-layer structure for extreme durability
• Tested for Auckland’s harsh conditions, fully warrantied
• NZ Building Code and council compliant

“If you want bulletproof protection, Viking Torch-on is it. We use it for our toughest jobs.”

Auckland Waterproofing Experts

• Nuraply bitumen membranes proven 30+ years
• Root & chemical resistance for garden/landscape walls
• Robust NZ warranties, technical support

What is it? Nuradrain is a high-strength drainage and protection board that manages water flow behind the retaining wall and shields the membrane during backfill.

Nuradrain Protection

Key features:

• Efficient drainage: Channels water away from the wall, reducing hydrostatic pressure and risk of leaks.
• Membrane protection: Acts as a physical barrier during backfilling, preventing damage to newly installed membranes.
• Lightweight and easy to install: Speeds up the construction process without compromising performance.

Proper drainage is as important as the membrane itself. Nuradrain ensures that water is managed effectively, preventing the build-up of pressure that can force leaks through even the best waterproofing systems.

“I’ve seen Nuralite membranes still performing after 30 years. That’s the benchmark we set.”

Auckland Waterproofing Experts

Every project is bespoke—tailored to the wall’s construction, soil type, and environment, ensuring maximum long-term performance.

• Structure analysis, wall engineering, exposure checks

• For perfect adhesion, the surface must be clean and fully repaired, with no holes, cracks, or rough edges remaining.

• Apply an additional protective layer to all joints. Depends on the chosen system such Sika Blackseal, Bituthene3000, Viking/Nuralite

• Sika Blackseal, Bituthene3000, Viking/Nuralite as appropriate to wall type

• Nuradrain boards, composite drainage sheets

• Final inspection, producer statement, council-ready paperwork

“It’s not just about slapping on a membrane. Every detail matters—drainage, joints, protection. That’s why our jobs don’t fail.

All waterproofing projects are backed by a 5-year workmanship warranty, with additional product warranties available that depend on the chosen system.”

Auckland Waterproofing Experts

When a homeowner in Albany contacted Auckland Waterproofing Experts, they were facing serious water ingress issues that were threatening both their property and peace of mind. Their 2.5-metre retaining wall, which supported a significant portion of their backyard, had begun showing alarming signs of water damage following Auckland’s intense winter storms.

The concrete retaining wall failure manifested in multiple ways:

Efflorescence Formation: White crystalline deposits had begun appearing on the wall surface, indicating that water was penetrating through the concrete and carrying dissolved salts to the surface. This wasn’t just an aesthetic issue—it signalled ongoing structural deterioration.

Recurring Garage Flooding: Every time Auckland experienced heavy rainfall, water would cascade down behind the retaining wall and flood into the attached garage below. The homeowner had resorted to using sandbags and constantly monitoring weather forecasts, turning every storm into a stressful event.

After conducting a thorough assessment of the property, our team designed a comprehensive three-layer waterproofing system specifically engineered to handle Auckland’s challenging weather conditions:

Viking Torch-on Tanking Membrane: We applied a robust torch-on membrane system to create an impermeable barrier across the entire retaining wall surface. This high-performance bituminous membrane bonds directly to the substrate, providing exceptional waterproofing protection that can withstand hydrostatic pressure from saturated soil.

Nuradrain Protection and Waterstop System: We installed a Nuradrain cavity drainage system that serves dual purposes: it protects the waterproofing membrane from damage during backfilling while creating a drainage path that channels any water away from the wall.

The proof of our waterproofing system’s effectiveness came quickly. When Auckland experienced its record-breaking rainfall events in 2024, this Albany property remained completely dry.

Zero Water Ingress: The retaining wall stayed completely dry throughout multiple severe weather events, including storms that caused flooding across many Auckland suburbs.

Garage Protection: The homeowner’s garage has not experienced a single flood since our waterproofing installation, even during Auckland’s heaviest downpours. What was once a constant source of stress is now a worry-free space.

Increased Property Value: Beyond the immediate waterproofing benefits, the professionally installed system has increased the property’s market value. When the homeowner recently had their property revalued, the real estate agent specifically noted the quality waterproofing as a significant value addition.

Long-term Stability: With proper drainage and waterproofing now in place, the soil behind the retaining wall remains stable, and the efflorescence has completely disappeared. The structural integrity of the wall is now protected for decades to come.

“We treat every wall as if it’s holding back Auckland’s wildest storm. If our waterproofing fails, we fix it—simple as that.”

Auckland Waterproofing Experts

“We don’t just waterproof walls. We protect homes, investments, and peace of mind—every project, every time.“

Auckland Waterproofing Experts

• Deep Auckland knowledge—bespoke solutions for your site
• Full assessment, custom install, council documentation
• Certified team—not generalists, genuine waterproofing professionals
• Proven results and warranties—trusted and local

• Basement Renovations Guide
• Waterproofing Membranes Types and Applications
• FAQs: Waterproofing
• Technical Data Sheets for Waterproofing Products
• Deck Waterproofing
• Below Ground Tanking

• MBIE External Moisture Guide
• BRANZ – Weathertightness
• Licensed Building Practitioners Reference

Don’t wait—catch leaks before disaster strikes.
Contact Auckland Waterproofing Experts for:

• On-site risk assessment and product selection
• Council documentation/compliance
• Long-term guarantees, backed by technical data

“We guarantee our work. If it leaks, we fix it. That’s the promise we give every Auckland client.”

Auckland Waterproofing Experts