Keeping moisture out.
Water is the thing that quietly wrecks a building. We install waterproofing systems for terraces, balconies, wet areas, planters, flat roofs, and below-ground structures - liquid-applied membranes, sheet systems, and coatings chosen for where they're going and what they're up against. Detailing at the edges and penetrations is where waterproofing succeeds or fails, so that's where the care goes.
Industries & environments
Residential & apartments
Terraces, balconies, and wet areas on homes and multi-unit buildings.
Commercial buildings
Roofs, podiums, and plant areas on offices, retail, and mixed-use.
Below-ground & retaining
Basements, lift pits, tanks, and retaining walls under constant water load.
Wet areas & interiors
Bathrooms, showers, laundries, and plant rooms behind tile and finishes.
Planters & landscaping
Planter boxes, green roofs, and podium gardens where soil sits on structure.
Remedial & existing buildings
Failed or ageing waterproofing traced, repaired, and re-detailed.
A single coat won't cut it
Finish
Tile, topping, or wearing surface. It's what you see and walk on — but it isn't the waterproofing. The system underneath is what keeps water out.
Protection layer
Shields the membrane from damage once the finish goes on above it. Without it, the layer doing the real work takes every screw, boot, and point load.
Membrane
The waterproof layer itself, carried across the floor and turned up the wall as an upstand. Chosen for the exposure and movement it has to handle — and only as good as its detailing.
Reinforcement
Extra reinforcement worked into the corner where floor meets wall - the junction most likely to move and crack. This is where waterproofing is won or lost.
Drainage
The surface is set to fall toward the outlet, so water is carried off rather than left to pool. Drainage is part of the system, not a fitting added at the end.
Base substrate
The structure underneath, prepared and primed so the membrane bonds to it. Its condition and falls are set first — everything above depends on the base being right.
Waterproofing is a system (a membrane, plus everything that bonds it, reinforces it, protects it, and moves water away) detailed for exactly where it's going. It starts with the substrate, prepared and primed so the membrane bonds properly. The membrane itself is chosen for the exposure: liquid-applied for complex shapes, sheet or reinforced systems where movement and load are higher. Reinforcement goes into the corners, joints, and penetrations - the points that fail first. A protection layer shields the membrane once it's down, and falls and drainage carry water off before it can pool. Water finds the weakest detail, not the widest surface. That's why the edges, upstands, and penetrations matter more than the open field.
Systems & finishes
Liquid-applied & reinforced membranes
Seamless membranes for terraces, balconies, roofs, and canopies, flowing into complex shapes with no joints to fail - plus fibreglass-reinforced and wet-area systems where higher movement or load calls for added strength.
Protective & exposed coatings
Trafficable and UV-stable coatings for surfaces left exposed — roofs, plant areas, and terraces without a separate finish over the top.
Repairs & maintenance
Failed waterproofing traced to its source, repaired, and re-detailed - rather than recoated over the top and left to fail again.
Get your project quoted now.
Our range of services
Protective & decorative coatings
Protective and decorative coatings for concrete, steel, and masonry - from corrosion protection to finished surfaces you want people to see.
Waterproofing systems
Waterproofing for terraces, decks, wet areas, flat roofs, and below-ground structures - membranes suited to the exposure.
Slip Resistance and Compliance
Anti-slip surfaces and independent slip-resistance testing — measured against NZ standards, not guessed.
Concrete repair & protection
Repairing and protecting concrete - cracks, spalling, and surface damage put right, then sealed against what caused it.
Commercial
We work with construction teams, architects, specifiers and property owners on technically demanding projects. Waterproofing systems, protective coatings, anti- slip treatments on new surfaces - specified, applied, and documented.
Residential
Whether the work ends up on show or behind a wall, the standard doesn't change. High-impact areas get the attention they deserve. How it looks when we're done is part of how we think on every job - not something you need to ask for.
Articles
New Eden Terrace Home & Brand Refresh | Alps Group
Alps Group marks five years with a restored heritage home in Eden Terrace, a brand refresh and a new website - shared with El Contractor and artist Amanda Gruenwald. Together, the changes reflect how far the we've grown, and where we're heading.
How anti-slip systems work and how to choose one
Slips are one of the more common causes of injury on pedestrian surfaces and one of the most preventable.
Get your pool ready before summer
Whether it's a backyard pool that's looking tired or a public pool that has to pass inspection before it reopens, we'll restore the surface, protect the structure, and provide lasting solution.