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AN INTIMATE UNDULATING 'FOUR RIBBON' ROOF

WORKING DETAILS - ROBIN HOUSE

At the heart of the hospice is a two-storey trapezoidal space.

Internal east and west walls run between a 7.2m-long external wall to the north and a 10.8mlong external wall to the south.

The space is covered with an undulating roof, sweeping low enough to create an 'intimate' space while rising to accommodate the lift shaft.

The roof structure takes the form of four 'ribbons', framed with steel and clad with timber.

The two outer ribbons are 1.8m wide and parallel. The two inner ribbons taper from 1.8m wide on the north wall to 3.6m wide on the south wall.

All four ribbons follow the same pattern of curves but each is offset 3m against the one next to it. This creates eyelet windows between each peak and trough of adjacent ribbons. At the south wall the roof offsets extend to act as a stepped canopy.

The steel frame of each ribbon is a pair of undulating beams formed from curved and straight 356 x 171mm UBs. The curved UBs at high and low points were cold-rolled to identical arcs; the straight UBs were set at a 20º gradient; all are bolted together with welded endplates. The beams are tied together at low points by paired 203 x 203mm UC outrigger beams resting on columns.

The roof is drained at low points by hoppers set between the outrigger beams which drain into pipes fixed in the webs of the columns.

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