Tabernacle Staircase 01

The stair uses the shape of a spiral to nestle into an irregular shape in a corner, while hugging a structural column. This transformed into a free-standing bifurcating double spiral stair that combined the travel routes between different spatial functions of the studio. The unique form offers many opportunities. Its structural integrity allows it to be self supporting; the treads raked inwards to provide a nominal handrail.

The economical use of timber was paramount, minimising the structural depth of the tread for an optimum cantilever that deftly manoeuvred the stairs shape to occupy regulatory head heights. As a result the tread length was gradually reduced in the stair climb utilizing both structural and spatial conditions that informed the design. The stair has been a useful in-house prototype to test methods of assembly and construction, showing one way to use mass timber as the main structural material and minimizing the embodied carbon footprint of a building.