WPC joists are made of ecologically friendly materials – wood and plastic pellets, which make these materials especially durable and long-lasting. Decking joists can be used for decking sub frames as well as in building fences and other composite frames where needed. Joists are suitable for Irish climate conditions both in winter and summer. Joists are resistant to water, constant moisture, frost – it does not rot, does not decay and will not be eaten by insects no like ordinary wood materials. They come in 4m but can be manufactured longer according to requirements.