Duo™ Interlocking Concrete Blocks

Duo™ blocks are used to build retaining walls, storage bays and segregation walls for materials such as aggregates, salt, compost, grain, woodchip, waste and recyclables. They are also suitable for temporary works, fire-resistant walls and above-ground fencing or hoarding systems.

Duo™ blocks are generally classed as a temporary or semi-permanent structure because they are dry-laid and can be dismantled and relocated. This often reduces planning requirements and can lead to lower business rates, though local authority guidance should always be checked.

In most cases, no traditional foundations are required. Duo™ blocks can be dry laid onto any firm, level surface with adequate ground bearing capacity. Ground conditions should always be assessed before installation.

Many Duo™ block structures do not require planning permission, particularly when used as temporary storage bays. However, planning rules vary, so it is recommended to confirm with your local planning authority before construction.

Maximum wall height depends on block configuration, stored material type and density, ground conditions, and wind loading (for freestanding walls). Guidance is available in the Stability & Loading Calculations Directory. A structural engineer should be consulted for taller or higher-risk walls.

Yes. Duo™ blocks are manufactured from precast concrete, which is non-combustible and provides excellent fire resistance, making them suitable for waste, recycling and industrial environments.

Yes. Duo™ blocks are designed to be fully reusable. They can be dismantled, reconfigured and relocated without specialist lifting equipment, making them a cost-effective long-term solution.

The Duo™ range includes three modular sizes: 600 × 600 × 450 mm, 1200 × 600 × 450 mm, and 1800 × 600 × 450 mm. This allows flexible wall and bay design to suit different site layouts.

Weights vary by size: Small block: 375 kg; Standard block: 750 kg; Large block: 1125 kg. Exact weights are provided in the technical specifications.

Yes. Duo™ interlocking concrete blocks comply with BS EN 1992-1-1:2004 – Design of Concrete Structures and are manufactured in the UK by Elite Precast Concrete.

Yes, when designed correctly. Walls should be built on a suitable base and materials should be allowed to naturally form against the wall. Loading guidance is available, but structural advice should be sought where required.

No. Duo™ blocks are dry-laid. Their interlocking connector system provides stability without mortar, adhesives or mechanical fixings.

Yes. Duo™ blocks are designed for external use and perform well in harsh environments, including exposure to weather, freeze–thaw cycles and heavy-duty industrial use.

The finish is classed as basic under the National Structural Concrete Specification. Decorative finishes are available separately.

Before lifting or reusing blocks: inspect lifting pins for wear or corrosion; check blocks for cracks or damage; avoid impact from mobile plant during use. Damaged blocks should not be lifted or installed.

Yes. Elite Precast Concrete offers design and installation guidance, stability and loading advice, and structural and foundation design reviews on request.

It is the customer's responsibility to ensure appropriate structural and ground checks are completed before installing any precast concrete products.