DRAINAGE ACCESS COVERS WITH INFILL CAPABILITY
Wunder-Grate
Wunder-Grates apply the recessed infill technology of our Wunder-Cover system to stormwater drainage applications.
Traditional drainage grates are functional but visually intrusive. Wunder-Grates combine effective drainage performance with aesthetic integration, using a recessed frame that accepts infill materials while maintaining stormwater flow through carefully designed openings.
Manufactured in New Zealand.
WUNDER-GRATE FEATURES & SPECIFICATIONS
Innovative Design
Custom sizes and configurations available. Standard sizes from 300x300mm to 1000x1000mm, plus custom dimensions on request.
Versatile Applications
Suitable for cobblestones, concrete, asphalt, tiles, and any hardscape requiring effective drainage with a professional finish.
Durable Construction
Hot-dipped galvanised steel as standard. Stainless steel recommended for coastal and high-salt regions to avoid corrosion.
Drainage Performance
Maintains full flow capacity while blending with surrounding surfaces. Grid openings sized for optimal hydraulic performance.
Load Rated
Wunder-Grates are suitable for Class A, B, and C applications, including pedestrian zones, residential driveways, car parks, and light vehicle traffic. Higher load ratings available for specific applications.
NZ Made
Locally manufactured with fast turnaround times and full technical support.
INSTALLATION GUIDE
All work must be undertaken in a tradesman-like manner in accordance with local health and safety requirements and relevant standards.
FRAME INSTALLATION REQUIREMENTS
Wunder-Grate frame and lid installation showing proper support and drainage channel
INSTALLATION REQUIREMENTS
- Frame must be fully supported on all edges
- Good quality load-bearing concrete or similar bedding material required
- Concrete must be fully cured before frame is subject to loads
- Ensure adequate fall for drainage
IMPORTANT INFORMATION
INSTALLATION NOTES
Standard Sizes:
- 300 x 300mm
- 600 x 600mm
- 750 x 750mm
- 1000 x 1000mm
- Custom sizes available
Tray Depths:
- 100mm (standard)
- 150mm (for natural grass applications)
NEED HELP?
TECHNICAL SUPPORT
Installing a Wunder-Grate for the first time? Our team provides technical support for contractors and specifiers.
- Installation guidance
- Frame support calculations
- Custom configuration advice
- Site-specific recommendations
FAQ
Frequently Asked
What are Wunder-Grates?
Wunder-Grates are drainage grates with recessed infill capability, designed to blend seamlessly with surrounding surfaces while maintaining effective stormwater flow. Unlike traditional drainage grates, Wunder-Grates allow infill with pavers, concrete, or other materials, making them virtually invisible in streetscapes and landscaping.
What's the difference between Wunder-Covers and Wunder-Grates?
Wunder-Covers are solid recessed trays for utility access (manholes, inspection chambers). Wunder-Grates have drainage openings to allow stormwater flow while still providing the aesthetic infill system. Both use the same recessed frame technology.
What load class are Wunder-Grates?
Wunder-Grates are suitable for Class A, B, and C applications, covering pedestrian areas, residential driveways, car parks, and light vehicle traffic. Higher load classes available for specific applications.
Can Wunder-Grates handle heavy vehicles?
Standard Wunder-Grates are designed for pedestrian and light vehicle applications (Class A-C). For roads with heavy vehicle traffic, higher load ratings can be specified. Contact us to discuss Class D or higher requirements.
Do Wunder-Grates reduce drainage capacity?
Wunder-Grates are designed to maintain effective stormwater flow. The grid openings are sized to provide adequate hydraulic performance while supporting the infill material. Drainage capacity depends on grate configuration and infill type.
What infill materials work with Wunder-Grates?
Pavers, brick, and concrete are common infill options. You can also leave sections of the grate open for maximum drainage flow, or use a combination of infilled and open areas depending on drainage requirements.
Are Wunder-Grates suitable for coastal areas?
Yes, when specified in stainless steel. Stainless steel construction is strongly recommended for coastal and high-salt environments to prevent corrosion. Hot-dipped galvanised steel is standard for inland applications.
How deep are Wunder-Grates?
Standard tray depth is 100mm, suitable for most paver and tile applications. 150mm deep trays are available for natural grass installations requiring deeper soil for root growth.
ABOUT WUNDER-GRATES
Traditional drainage grates are functional but visually intrusive – exactly the problem Wunder-Covers were designed to solve for utility access. Wunder-Grates apply the same recessed infill technology to stormwater drainage.
APPLICATIONS
Wunder-Grates are ideal for pedestrian zones, heritage streetscapes, shopping precincts, residential driveways, public plazas, and any application where drainage is necessary but visual intrusion is unacceptable. They’re particularly valuable in shared spaces where cycle safety and pedestrian comfort are priorities.
LOCAL MANUFACTURING
Every Wunder-Grate is made in New Zealand with options for custom sizing and configurations. We provide complete technical support from specification through installation.