Keystone is a modular walling system made from high-strength concrete, designed for retaining walls and engineered structures. Units use a patented blue comb connector for secure assembly and can be built with geogrids for tall or high-load walls, or as gravity walls with or without concrete backing.

  • Modular concrete units for retaining and structural walls

  • Patented blue comb connector locks components securely

  • Compatible with soil reinforcing geogrids for increased wall height and stability

  • Dry-build method allows fast installation and minimal site disruption

  • Suitable for curved, straight, or complex wall layouts

  • Available in multiple block sizes, caps, and colours

Applications

  • Retaining walls

  • Embankments

  • Culverts

  • Tunnel entrances

  • Access ramps

  • Bridge abutments

  • River diversions and flood alleviation schemes

Dimensions

Keystone Block: 300 mm W x 455 mm L x 200 mm H, 39.5 kg

Keystone Cap (200 mm): 267 mm W x 455 mm L x 200 mm H, 43.5 kg

Keystone Cap (100 mm): 267 mm W x 455 mm L x 100 mm H, 25.9 kg

Exposed face area per block: 0.091 m²

Coverage per pack: 2.184 m² (block), 2.912 m² (200 mm cap), 2.184 m² (100 mm cap)

Materials

Made from high-strength, durable concrete

Options and variations

Block colours: Flint, Yorkstone, Sandstone, Ivory, Pewter

Block types: Standard, Smooth, Cap (200 mm and 100 mm), Corner Block, Slips

Performance

Can be built to heights over 15 metres with geogrid reinforcement

High connection strength between block and grid

Installation

Dry-laid construction method

Positive pin connections for stability

Compatible with proprietary geogrid systems