Bio-based materials, such as wood-plastic-composites (WPC), raised the interest of the bulk-plastics consuming building industry. So far, this novel composite is being used in decking and cladding. However, the structural design of a façade made from WPC compound proved to be difficult in the past due to a lack of planning principles and experience.
This case study exercised a design concept which combines particular material attributes describing the strength loss due to diverse weathering impacts on façades. Although this approach is widely applied in Central European cladding kit approvals it was not yet being used for WPCs. This paper is therefore unique to the extent that for the first time research findings taken from a literature review about WPC attributes were applied to this concept to find out about a realistic WPC design value for engineered façade planning. It was found that simulated WPC aging in three main categories lead to approximately 50% strength loss of virgin material. However, a WPC design value which integrates aspects of such material aging is still applicable and it supports a façade planner`s practical work in the light of mandatory codes and norms in this field.