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Whiteriver Composite Decking Joist 40x25x3000mm | Charcoal
40mm x 25mm composite joists are generally for use in small balcony areas where structural height is not possible. Ventilation and drainage need to be carefully considered when using this joist in a balcony area. This joist cannot be load bearing it must be fully supported. The joists MUST BE PREDRILLED before fixings are screwed to it.