glued plywood sheet on the outside, a 25 mm ventilation gap behind this and then 45 +140 = 185 mm rockwool thermal insulation and the vapour barrier. Affixed to the outside of the plywood are 100 x 50 mm spacer battens which carry the horizontal cladding. These 200 x 25 mm pine planks are inclined at 30° to the vertical, which gives the building a highly expressive exterior profile. These huge wall elements had to be transported from the factory to the site at night, involving considerable cost and coordination! Finally, the exposed interior 12 mm birch plywood was added. The gable walls are constructed similarly, only in this case, in contrast to the side walls, the internal cladding is placed in front of the posts so that these are hidden.

12 | Hall facade with row of windows at base.

1 I Site plan, scale 1:2500.

2 | The principle of the "Zoll-bau" roof as given in a publication from 1923: "One continuous member (a) always intersects with two identical non-continuous members (b) at every node. These are held together tightly by means of bolts (c) and specially shaped washers."

3 | The standard node of the roof system as developed by City Building Surveyor Zollinger.

4 | Gable elevation as hall cross-section, scale 1:300. The gable posts are 270 x 160 mm, in the centre 320 x 180 mm, and 320 x 160 mm at the quarter points.

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