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Prototype for a prefabricated classroom

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The two prototype buildings demonstrate how prefabricated systems can be modified to produce an environmentally sound and energy-saving classroom.They have identical plans and construction but are clad with different materials - the junior school is clad with panels of horizontal untreated Western Red cedar boards and the secondary school is clad with galvanised steel mesh screens, on to which plants will be encouraged to grow.

Each building is fabricated from four 13.3 x 3.3m Yorkon modules bolted together.One contains an entrance hall and WCs, the other three - with some intermediate walls omitted - form the main classroom and conservatory.Above the conservatory the roof has been omitted but the edge beams have been retained to support a new glazed pitched roof.Standard door and window assemblies have been used throughout.

Above the classroom and entrance hall a green sedum roof, laid on firrings, has been added to the standard Yorkon flat roof, a structural composite panel comprising a profiled steel sheet bonded with rigid insulation to an inner steel deck.Ventilators and sun pipes run through the roof at the back of the classroom.

The new galvanised steel mesh screen and cedar board cladding run to the eaves, concealing the standard edge beam, fascia and standard composite wall panel.

Internally an additional layer of plasterboard on battens has been added to the standard wall panel - profiled-sheet bonded with rigid insulation to an internal lining of fire-resistant board - to form a cable void.The standard floor construction has also been modified to create voids for cable runs.Each module rests on six steel screw pile foundations, which support the steel joist Yorkon floor structure.

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