Pitched roof

Systems in architecture

Fig. 18: Site plan

Conradin Clavuot: School in St Peter (CH), 1997

Fig. 18: Site plan

Conradin Clavuot: School in St Peter (CH), 1997

The multiple pitched roof

The crystalline form of the Böhler house harmonises in an obvious way with the mountainous landscape. The volume clings to the slope like a boulder, the irregular roof form underscoring its amorphous character. The animated silhouette of the slate-covered roof surface seems to emulate the outline of the mountains. Similar to the design of the facades, which are determined by a seemingly traditional fenestration but whose arrangement is actually a departure from tradition, the roof form oscillates as well between expressive gestures and hand-crafted traditions. The transition to the masonry is not abstract but instead employs the classical overhanging eaves, which protect the facades against rain and melting snow.

Fig. 17: Heinrich Tessenow: Private house (Böhler), St Moritz (CH), 1918, destroyed 1989

The pitched roof as a geometric element

Boasting different sizes, the exhibition wings of the Glarus Art Gallery dominate this L-shaped complex on the southeastern edge of a park. The one- and two-storey pavilions appear as simple, rectangular buildings. Three exhibition rooms, one lit from the side and two from overhead, are the focal points. The rectangular brick volumes are each crowned by fully glazed pitched roofs whose architectural design emphasises the will to reduce the form. Although the overhang of the r oof on all sides is minimal, it still generates a shadow on the walls below and hence reinforces the independence of the roof form. The glazed roofs illuminate two of the exhibition rooms, separated only by a dust screen.

The integrative pitched roof

The extension to the school in St Peter integrates seamlessly into the local setting. The new buildings supplement the local built environment, which is characterised by a precise, functional positioning of the buildings and a choice of materials heavily influenced by the type of construction. Nevertheless, the pitched roofs of the new solid timber buildings achieve a certain autonomy thanks to subtle differences. Their roof surfaces are somewhat shallower than those of the neighbouring buildings and are finished with sheet metal. Wood-based boards replace the purlins of these couple roofs at the overhanging canopy, resulting in a delicate verge detail. The likewise slim eaves detail is characterised by a gutter that continues beyond the junction with the verge and acts as a spout, discharging the rainwater in a visible, thin, splashing stream directly into a gravel soakaway.

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