For unsymmetrical shape plans try to arrange the largest area of regular, parallel and almost equal length elements, then support the remainder in the best possible way.
A flat space frame roof may be possible subject to the rigorous planning geometry inspired by this type of structure. An alternative approach is to adopt a regular planning grid for the structure and to cantilever beams to form the asymmetric edge.
Space frame over irregular grid or with cantilevered edge
The placement of the structure relative to the building skin is an important consideration. It may be internal, within the thickness of the wall or, with careful detailing, external to the skin.
The structure system for a building is usually arranged within or close to the exterior environmental envelope to reduce intrusion into the usable plan area. The most straightforward arrangement is to have the structure internally, with the water proof and insulation layer externally. Structure may be place within the thickness of the skin, but consideration is required here of the modularity of the infill and the risk of cold bridging. Structure placed externally may allow a clean interior volume and allow external expression of structure, but the detailing required to prevent water penetration and cold bridging required very serious consideration
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