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Designed for Wall Cladding or Decking projects with a hollow core construction for a lightweight subframe, Cladco 4m Structural Composite Joists offer a wide supporting surface for the base of your project. Produced from 60% recycled hardwood fibres and 40% recycled plastics Ideally placed onto a concrete base underneath Used for elevated Decking areas Cladco Structural Joists will require support every one metre for the substructure of the joist system itself. When installing Composite Decking onto Structural Joists, we advise 400mm centres