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Light and ventilation chimneys

aj working details

The two-storey school was designed on sustainable principles and the layout is arranged to give maximum flexibility. Junior classrooms are on the first floor, while infant and reception classrooms are on the ground floor with direct access to a courtyard play space; it is partly sheltered by three first-floor extensions, which project over it.

The building has a steel frame supporting precast concrete plank floors with structural topping. At lower levels, the walls are cavity construction, with a blue ceramic glazed brick outer leaf.

At upper levels, the walls comprise an external steel wall system, lined on the inside with a double skin of wallboard and plasterboard, and on the outside with ply, rigid insulation and an outer coat of acrylic render.

The roof is planted with sedum, an evergreen plant that protects the substrate and requires little water.

A series of light and ventilation chimneys run along the roof. Together with adjacent pairs of roof lights, these allow natural light into the rear of single-aspect classrooms and provide natural ventilation by stack effect.

Each chimney is formed of a 100x100mm SHS frame, fixed to a reinforced concrete upstand.

The west side is clad with 19mm ply and 100mm rigid insulation, with an outer coat of acrylic render. The north side is also clad with insulated render system and has an opening vent at the top, operated by a teleflex that extends down to the classroom.

The south and east sides of each chimney are fully glazed with etched inner leaves to give translucency. The glazed unit on the east is hinged and set in a steel angle frame to allow access for maintenance.

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