The structural solution for the roof is a lamella structure in which the timber members form a pattern of lozenges. This structure works by having simple, repetitive short lengths of timber glu-lam beams, made of fir and joined together to form the dome. The pattern changes at the crown where the structure terminates in a circular ring beam, defining a 30 metre-diameter oculus constructed from a simplified pattern of glu-lam members.

The primary members of the dome are connected invisibly, so that even though they are bolted together, all of the metal is hidden within the wood so that observers beneath the dome will perceive only a continuous timber structure. The beams are topped with two layers of plywood and a layer of insulation, topped with a seamless liquid application roofing system for a weather-proof finish.

The entire roof sits on a three metre high ‘skirt’ to overcome the possibility of unusable low space at the perimeter of the dome. The skirt is comprised of 20 boomerang-shaped columns supporting the domes perimeter beam. Inclined struts spring from these columns to directly support the ring beam where it meets the timber grid-shell, while providing stability to the entire structure.