The galleria is composed of two layers, with the inner layer formed by 47 vertical radial arches, each of which increases in spacing between one another as it approaches the main entrance. The radials provide lateral support against the wind for the outer layer, a glued laminated timber mullion grid, as it transfers the weight to the floor. Both of these sit on a steel frame, which supports the galleria. The mullion grid itself is attached to sliding bearings, that allows its curtain wall to adjust to changes in temperature, without compromising the integrity of the wood. Most of the timber was made of Douglas fir trees, from a manufacturer based in Penticton, British Columbia. Each piece of timber is unique, given that the galleria's design featured slants that increased in width incrementally, and whose curvatures were changing throughout its length.