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A steel-framed, barrel-vaulted roof

The steel frame of the twostorey house comprises 150 x 150mm SHS columns spaced at centres to suit the layout. The first floor is supported on timber joists which span between steel bearers.

The barrel-vaulted roof of the 9.9 x 4.2m first-floor studio spans 10 metres, supported only at the four corners. The two curved gables of the vault frame a glazed lunette; the end walls are of cavity blockwork with large windows.

The curved gables of the vault are formed by two pairs of curved 230 x 75mm PFC (parallel flange channels), which are welded back-to-back. They support the ends of a series of 200 x 50mm timber joists which are lined on both sides with ply in order to act as a diaphragm. A curved 'lunette' of frameless glass, butt-jointed with silicone, runs below the gable channels.

Each pair of PFC channels is welded with overlapping flanges to create a rebate for the frame of the glazing.

A 150 x 75mm PFC channel runs on top of the blockwork wall below each curved gable to act as a tie for the gable arch; it is bolted to the SHS columns which run below it to assist lateral stability.

Along the end walls the vault curves down to fabricated steel gutter boxes; at the corners they are bolted to the curved PFC channels to create a full perimeter frame to the vault roof. The gutter boxes act as edge beams spanning over the end window.

The perimeter frame rests on four 150 x 150mm steel stubs on angle brackets which are bolted to the SHS columns. This corner assembly is concealed by a triangular steel fillet.

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