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Cladco 4m Composite Joists/Batten are used as composite joists for decking or as composite battens for exterior wall cladding. They're made from the same composite material as Cladco Decking and Cladding Boards and are perfecty combined as composite decking joists and composite cladding battens. Provide a weather-resistant base Additionally, you may use them as battens for composite cladding It's highly recommend that for decking projects, joists are used in conjunction with a hard concrete base