selection of these glazing types was to achieve thermal insulation .
There are three double volume areas on the ground floor , two are reception atriums which are specifically for the use of the new corporate tenant and one which is for the retail spine . These double volume spaces allow for a vertical space creating a grand reception area and allow for ingress of natural light from the south .
Due to the limitations of the overall office ceiling heights double volume areas were created on the 2nd floor within the office space which create naturally , well-lit , vertical areas which allow for pause areas . Careful use of materials such as aluminium panels , performance glazing , and light coloured wall and floor tiles enhance the iconic brand value of the public atria .
Structure All existing concrete structural elements remained , the addition of new Bondek slab in-fills allowed for the expansion of the building ’ s footprint . New steel framing structures allowed for the fixing of the curtain wall system as well as the aluminium cladding . Due to the irregularities on the existing structure & slab edges it was a challenge to co-ordinate all the structural elements as well as the curtain walling and cladding .
During the demolition process the team encountered downstand beams and other elements that would not have been noted during the surveys . This unfortunately required some re-design of some areas and details to accommodate existing structures .
Roof The existing timber and tiled roof was removed and replaced with a new lightweight roof structure supported on a ring beam and girder on the south elevation of the building . The steel structure was designed and constructed with structural steel lattice trusses , girders and lattice columns . This allowed for the new soft roof to be concealed behind the façade .
The steel frame principle also allowed sufficient flexibility to achieve a curtain wall cladding accentuated with aluminium solid elements as well as utilising the steelwork at roof level to support a balcony structure . The design demanded coordination of the engineer ’ s requirements , the curtain wall shop drawings and the detailing of the solid aluminium elements during the pre-contract documentation stage and on site construction .
The structure supporting the multi-level façade also provides vertical support for the roof structure . This structure was designed and constructed with conventional I and H structural steel sections . The exposed steel hangers with intumescent paint were constructed from hollow sections and these support the Bondek infill floors . A number of these columns , in particular on the 4th floor terraces , are features with no structural significance , however six of these columns have been designed to provided vertical support for the roof structure .
HVAC
• An energy efficient variable air volume system supplies conditioned air from air handling units located in plant rooms .
582 33 Baker Street