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INSULATING CONCRETE FORMWORK HOUSE SHELL

CONCRETE QUARTERLY SPRING 06 - WORKING DETAILS / STYRO STONE HOUSE

This two-storey house over a basement is constructed using insulating concrete formwork blocks of dense polystyrene called Neopor. Above ground, the external walls are formed with 1,000 x 250 x 350mmthick blocks, while below ground and internally, walls are constructed from the narrower 1,000 x 250 x 250mm-thick blocks; both block types result in a 140mm nominal concrete wall.

Only the basement walls required reinforcement, the horizontals laid in the Vprofiled high-density plastic wall ties connecting outer and inner leafs; verticals can be fixed to the ties. Prior to concreting, proprietary support trestles are located at approximately 2,000mm centres to provide stability, an access platform and ensure vertical and horizontal alignment of the walls.

Above ground, a concreteflow restrictor was used for the initial pour, which for the entire perimeter was restricted to 400mm to 500mm high, minimising the possibility of the shutter shifting or bursting. After this, the restrictor was removed and the pour rate increased.

Here we show detail of a full brick skin, which is tied back to the permanent formwork with stainlesssteel wall ties fixed prior to concreting. Internally, any chasings for service routes were cut as shallowly as possible and staggered. Walls were dry lined with Fermacell board.

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