A first-of-its-kind hybrid cross-laminated timber (CLT) and natural fibre construction system forms the wave-like roof of an experimental building designed by students at the University of Stuttgart in Germany. The Hybrid Flax Pavilion was developed by the university’s Institute for Computational Design (ICD) and Institute of Building Structures and Structural Design (ITKE) for a garden show in Wangen im Allgäu on the banks of the Argen river. The gently undulating circular roof is formed from alternating ‘spokes’ of CLT panels, and CLT panels reinforced with robotically wound flax fibre, to enable an expansive column-free space. The lightweight solution was developed to show how significant demand for timber, a scarce resource in some parts of the world, needed to deliver low carbon buildings, can be met using alternative natural materials. …The primary framework for the roof comprises 44 CLT panels, 20 of which are hybrid flax fibre/CLT panels spanning a 8.6m space between linear supports.