Less weight, more substance

Hollow Blocks from CSS retain excellent load-bearing properties, but use less material to manufacture which makes them lighter, and a more sustainable option for green building.

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Cement Ash



Our Hollow Blocks are available in two ranges – the S Range and the N range – and in a wide variety of widths and heights, for maximum flexibility.

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Our "S Range" comprises of void forming Cement Ash Blocks which are essentially void formers. Our "N" Range blocks qualify as structural elements which require concrete to be poured between them above the ribs, but slabs made with them do not require mesh.
  • Seven different designs available: S120, S150, S205, S290, S Tray, N170, N255 and N Tray, all 450 mm long and 220 mm wide of varying height, and cross-centre distance of 600 mm.
  • The N150 is 500 mm wide with nominal cross-centre distance of 600 mm.
  • Interlocking “S Range” system.

A Block for every job

Let us advise you on the ideal hollow concrete block for your requirements.

Volume of Concrete "N Range"

N170° - 170° - volume of concrete per m² = 0.55m³

N255° - 255° - volume of concrete per m² = 0.81m³