Metal Floor Decking Profile

Deck Specification


Updated from the original R51 product in 2018, this profile is available in S350 and S450 grades to provide the designer greater flexibility. R51+ is a traditional re-entrant profile commonly used on inner city multi-storey projects, where the structural zone and storey height is reduced, due to the relatively thin slab depth required to achieve a typical one hour fire rating.


  • 102mm minimum slab depth
  • Optimised to maximise structural efficiency of steel
  • 150mm trough spacings provide flexibility for stud placement
  • TAB-Deck™ fibre concrete solution


  • 0.8mm
  • 0.9mm
  • 1.0mm
  • 1.2mm


  • 600mm cover width
  • 52mm deep

Steel Grade

  • S350
  • S450


  • Galvanised (Z275)
  • HD (ZM310)

Available from SMD Ltd, download SMD Elements® Design Software

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Metal Decking continues to provide the best fast-track, flexible, and financially-effective solution for suspended floor slabs in steelwork construction.

Thru Deck Services has access to the full range of SMD Ltd’s product range, providing a solution for all suspended floor slab requirements, including concreting on metal decking and roof decking.

Thru Deck provides a comprehensive service in design, manufacture, supply and installation of metal deck, shear stud welding concrete.