To accommodate all movements of the roof structure caused by snow and wind loads, the connection to the main facade, the base of the entrance structure, and the entry into the outer portal structure are flexibly mounted or connected. The roof surface itself consists of triangular frames made of LI 100 steel profiles laid at a slope, upon which 25 mm thick, boil-proof bonded plywood panels are attached. These panels are also manufactured in triangular shapes and fastened to the 90 x 60 mm cross-sectional timbers fitted within the LI frames.
