Spiroll extruded hollow core floor slabs were introduced in Italy by Generale Prefabbricati in the mid-1970’s. Since then, the Company has consolidated its position as a market leader, in terms of their presence, applied technologies and quality standards.
Generale Prefabbricati is specialised in the research, design and marketing of prefabricated hollow core floor slabs. From its 3 manufacturing plants (north, central, southern Italy), it targets markets throughout entire domestic area and neighbouring countries, as well as international markets through special dedicated factories.


  • Minimum fire resistance equal to R=90’ and designable up to R=180’ (UNI EN 1992-1-2)
  • Good thermal and acoustic insulation performance
  • Low deformability due to bending
  • Anti-seismic efficiency thanks to the excellent transmission of stress on surfaces
  • Possibility to creating perforated patterns and cantilevers
  • High transverse load capacity through the longitudinal joint arrangement
  • Possibility of reaching large gaps with high loads and small thicknesses
  • Self-supporting at all stages of assembly
  • Adaptability to the passage of systems
  • Smooth metal mould surface, ready for painting
  • High technical and functional reliability, guaranteed by rigorous quality control
  • CE marking of components (UNI EN 1168)
  • C 45/55 concrete
  • Harmonic steel in stabilised strands fptk = 1860 N / sq mm., fp(1)k = 1670 N / sq mm.
  • Concrete for supplementary casting C 25/30
  • Can be used in aggressive environments

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