SUPERSLAB™

Engineered Concrete Slab Foundation System

Superslab™ is an engineered slab-on-ground flooring system that delivers exceptional strength, stability, and efficiency beyond traditional foundation designs.

Developed for New Zealand conditions, it offers a high-performance solution for residential, shed, and light commercial foundations. Its integrated rib-and-pod structure creates a strong, durable floor with minimal excavation and excellent thermal efficiency — helping you build stronger, faster, and smarter.

Where to Use Superslab™

Superslab™ is suitable for a wide range of applications across all ground classifications:

  • Residential foundation and floor slabs

  • New builds, renovations, and extensions

  • Shed floors for agricultural, storage, or workshop purposes

  • Light commercial buildings

  • Warehouses requiring durable, high-load floors

Improved Thermal Performance

Superslab™ delivers higher R-values than conventional slabs and can be paired with compatible edge and under-slab insulation systems to form a fully thermally broken foundation — ideal for in-slab heating and H1 Energy Efficiency compliance.

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Engineered Strength and Stability

The ribbed “waffle” structure distributes loads efficiently, delivering a stiffer and stronger floor than a traditional slab-on-grade system. Superslab™ performs reliably across a wide range of soil types, including low-bearing ground common in Canterbury.

Built to Last

Superslab™ uses 20–25 MPa concrete mixes formulated for New Zealand exposure zones and is engineered for a minimum 50-year design life — supporting durable, long-term performance.

Why Choose Superslab™?

Superslab™ provides key advantages over conventional 100 mm mesh slabs:

  • Up to 30% faster installation

  • Reduced excavation and site waste

  • Improved thermal performance (higher R-values)

  • Proven durability for New Zealand exposure zones

  • Adaptable to suit specific soil conditions

  • Straightforward installation of services

  • BRANZ Appraised and CodeMark Certified

  • Sustainable recycled-plastic pod options available

Faster Installation and Less Excavation

Superslab™ reduces earthworks, site preparation, and construction delays. Experienced contractors can typically complete installation in around three days — significantly faster than a standard foundation system.

Sustainable Pod Options

Superslab™ can incorporate recycled-plastic pod void formers as an alternative to traditional polystyrene. These sustainable pods offer:

  • Zero landfill waste

  • Reduced site trimming

  • Lower transport and storage costs

  • Fast installation

  • Full structural performance

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Certified for Confidence

Superslab™ carries New Zealand’s highest levels of assurance:

  • BRANZ Appraisal No. 964 (2023)

  • CodeMark Certification

CodeMark Certification means building consent authorities must accept Superslab™ as complying with the New Zealand Building Code when installed in accordance with its certificate, helping streamline the consent process.

Build on a Foundation You Can Trust

Superslab™ delivers proven strength, efficient installation, and long-term reliability — making it the ideal foundation system for builds across Canterbury.

Talk to the Ashby’s Ready Mixed team to find out how Superslab™ can support your next project.

As part of Holcim New Zealand, Ashby’s Ready Mixed supplies SuperSlab™ concrete mixes under licence from Allied Concrete, in accordance with BRANZ Appraisal No. 964 (2023) and CodeMark Certification.