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Working details

A HOUSING SCHEME WITH CURVEDAND CONCAVE ROOFS

The housing scheme consists of one-, two- and three-storey houses grouped into 'city blocks'. They are constructed of masonry walls and curved roofs of aluminium sheet with standing seams. The roofs of the twoand three-storey mid-terrace houses follow a symmetrical curve. The 'tower' houses - three-storey houses which stand at the corners of the blocks to give them emphasis - have raised concave roofs. The two-bedroom single-storey houses, which are designed for wheelchair access, have a waved roof shape.

The 'tower' houses are constructed of blockwork rendered with Stolit, an acrylic render which does away with the need for weep-holes and movement joints, and provides an impervious skin which is beneficial when using fully-filled cavities.

The roof structure is a steel frame of concave-curved RHSs supported on 100 x 100mm SHS posts; on one side of the roof the posts rest on a precast concrete padstone, on the other side they extend down to steel beams at roof level. A ply deck above and below the roof structure acts as a stressed skin to stabilise the curve.

The roof is covered with an EriscoBauder membrane on insulation with a concealed gutter. The eaves are extended with 'ladder' constructions of timber joists to give a delicate eaves line. They project over a band of clerestory glazing of doubleglazed high-performance timber windows.

The single-storey houses have a waved roof covered with aluminium standing-seam cladding on a doublelayer ply deck. Insulation is laid between Z-studs which are fixed to the profiled steel deck spanning between intermediate walls. Top-hat sections are cantilevered from the roof structure to form an extended eaves, and a box-section aluminium gutter is concealed behind an aluminium fascia.

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