Discover Danterr’s expert guide to concrete slab on ground (SOG) bar chairs. Learn about slab on ground design in Australia, slab on ground formwork and get the right chairs with confidence.
In this guide, we focus on two essential products in our range: Combination SOG Bar Chairs and our Cliptop variant. Both are designed for performance and reliability backed by tested materials, sustainable design, and compliance with Australian standards.
Achieving a high-quality concrete slab on ground starts long before any concrete is poured. The process begins with precise reinforcement placement, making sure the steel remains firmly in position and the concrete cover is uniform across the entire surface. Even a small oversight at this stage can trigger costly rework, project delays, or long-term structural problems that compromise the slab’s performance.
That’s where slab on ground chairs come in. These compact components play a critical role in maintaining rebar alignment and cover, allowing the concrete to perform as intended. Strength, compliance, and efficiency on site all depend on choosing the right bar chairs for the job.
Slab on ground bar chairs are purpose-designed plastic spacers that hold reinforcing mesh and rebars at the correct height during concrete pours directly onto the ground. By maintaining consistent slab thickness and accurate concrete cover, they prevent rebar from shifting during placement and vibration, ensuring structural integrity from the ground up. Their role is essential in achieving a high-quality, long-lasting slab that meets both design and compliance requirements.
When planning a project, the number of bar chairs you’ll need will vary depending on the mesh weight and site conditions. As a general guide, allow roughly one chair per square metre, or for heavier reinforcement, one chair every 0.6m². Always confirm quantities with your engineering specifications to ensure accuracy. Danterr’s slab on ground chairs meet AS/NZS 2425:2015 standards, are NATA-tested, and are built for safety, durability, and performance under real-world site conditions.
Danterr offers a comprehensive range of Concrete SOG bar chairs, each engineered to meet specific project requirements and cover depths. All are rust‑proof, lightweight, stackable, and backed by quality control testing.
Dual‑height chairs for flexible cover in shallow slab‑on‑ground design.
Key Benefits:
• Dual‑height option increases adaptability on varied slab thickness
• Rust‑proof and easy to handle on site
• Stackable for efficient transport and storage
• AS/NZS 2425 compliance ensures load capacity and durability
Technical Specifications:
• Available Sizes: 25/40mm-145/150mm
• Load Rating: Exceeds 120 kg
• Material: High-density plastic
Designed for applications where mesh may be walked on or repositioned, ensuring reinforcement stays level.
Key Benefits:
• Secure clip‑top mechanism prevents mesh movement
• Ideal for precast, Form Reo Pour (FRP) and high‑traffic slab‑on‑ground forms
• AS/NZS 2425:2015 certified, high stability
• Lightweight, stackable and rust‑proof for efficient logistics
Technical Specifications:
• Available Sizes: same as combination chairs, with clip‑on versions
• Load Rating / Compliance: AS/NZS 2425 tested to 120 kg+
• Material: Weather‑resistant plastic with cliptop
Choosing the right SOG chair offers project-wide advantages:
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Danterr’s Combination SOG and Cliptop chairs are relied on across Australia for projects like:
These chairs support slab thickness from shallow 25 mm cover for small concrete pads, up to heavy‑duty infrastructure slabs reaching 150 mm cover or beyond.
The Sydney Metro West – Central Tunnelling Package is a prime example of how Danterr’s Combination SOG Bar Chairs deliver real-world results. In this complex tunnel infrastructure project, our chairs ensured reinforcement stayed at the correct height with consistent concrete cover, even in high-pressure, high-traffic construction zones. Their ability to perform under challenging conditions not only met strict engineering standards but also helped streamline installation, proving their reliability and value in large-scale builds.
At the Western Sydney Airport (WSA) Terminal, a landmark project set to transform Australia’s aviation landscape, Danterr’s Combination SOG Bar Chairs have played a vital role in the foundation works. By keeping reinforcement securely in place during extensive slab pours, these chairs have supported structural integrity from the ground up. Supplied to meet AS/NZS 2425 compliant and delivered on time, they have helped drive efficiency, quality, and confidence in one of the nation’s most significant infrastructure developments.
When it comes to delivering long-lasting, structurally sound concrete slab on ground foundations, precision isn’t optional; it’s essential. The choice of slab on ground chairs directly impacts rebar stability, concrete cover accuracy, and compliance with Australian building codes like AS/NZS 2425.
At Danterr, we’re proud to supply Combination SOG Bar Chairs and Cliptop variants that are not only engineered for performance and efficiency but also crafted with sustainability in mind.
Backed by NATA-tested quality and delivered nationwide, Danterr is your go-to source for slab support that meets the mark from small-scale pads to high-spec infrastructure pours.
The Cliptop variant includes a locking mechanism to secure mesh or bar during setup or rebar movement.
Rebar chairs are intended to remain embedded in the concrete after it sets, serving an essential function in preserving the structural integrity and shape of the concrete.
All reinforcement must be firmly fixed in place to prevent it moving during concreting operations. Reinforcement must be supported off the ground or the forms by bar chairs made from wire, concrete or plastic.
Yes. They’re designed for universal fit with standard mesh and up to 20mm rebar.
Absolutely. Our bar chairs use eco-stable, recycled plastics — safe for use and better for the planet.
No. They’re load-tested beyond 120kg and used daily on high-strength pours in civil works.
Potentially. That’s why we offer multiple variants. Contact us for tailored recommendations.
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