View source for Sky campus, Osterley, London

==Article in [http://www.newsteelconstruction.com/wp/wp-content/uploads/digi/NSC1606digi/index.html#/14/ NSC June 2016]==
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'''Sky’s the limit for steel'''<br>
Steelwork’s [[Long-span_beams|long span qualities]] have created the [[The_case_for_steel#Take a load off your foundations|lightweight]] roof for a new [[Multi-storey_office_buildings#Mixed use commercial buildings|mixed-use building]] at the Sky campus in London.<br>

Phase two of the redevelopment of media company Sky’s campus at Osterley in west London has recently been completed.

Phase one included the Believe in Better Building, a structure that won a number of accolades including London’s ‘Best Building’ at the Institution of Civil Engineers’ (ICE) London Engineering Excellence Awards 2015, and the [[Braced_frames|steel-framed]] Hub [[Multi-storey_office_buildings|office building]].

Following on phase two, known as Sky Central, has included the [[Construction|construction]] of a [[Multi-storey_office_buildings#Mixed use commercial buildings|mixed-use structure]] offering 41,000m<sup>2</sup> of office space, studio, production and research and development facilities. Although the three-storey building has a reinforced concrete frame on piled foundations, a substantial structural steel element was needed to construct a [[Long-span_beams|long span]] roof, support the [[Facades_and_interfaces|cladding system]] and to form stand-alone internal [[Single_storey_industrial_buildings#Mezzanines|mezzanine]] structures.

The roof is a long span structure with primary steel [[Fabrication|fabricated]] box girders spanning up to 27m, which support secondary timber fins (purlins) that in turn support the lightweight roof deck and skylights. “A steel roof was chosen because we wanted a deep [[The_case_for_steel#Take a load off your foundations|lightweight structure]] that would allow natural light into the building,” explains Arup Associate Director Carolina Bartram.
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The [[Long-span_beams|girders]] are arranged in two rows that run along the middle of the building’s length, supported on columns at the ends and then spanning between six concrete [[Concept_design#Concrete or steel cores|cores]] three on either side. Further steelwork has been [[Construction#Steel erection|erected]] on top of these pods to form plant enclosures.

“Because the [[Long-span_beams|girders]] were too heavy for the onsite [[Construction#Tower cranes|tower crane]] we had to [[Fabrication#Handling and transportation|bring them to site]] in two pieces, each weighing 16t,” says Bourne Steel Divisional Director Kevin Springett. “We [[Construction#Steel erection|erected]] them individually using [[Construction#Temporary works|temporary supports]] that had to stay in place until the two sections had been [[Construction#Site bolting|bolted]] together.” A lot of [[Construction#Tolerances|accuracy]] was needed for the [[Construction#Steel erection|steel erection]] as the box girders incorporate a camber that forms the roof, while preinstalled brackets on the steelwork had to be in exact positions for the later timber installation programme.

The box girders were [[Fabrication|fabricated]] from 25mm thick plate and measure 800mm by 300mm. A further quantity of rooftop box girders, measuring 500mm by 300mm, form a perimeter ring around the building. Hung from the box girder perimeter ring is a secondary steel box section framing system that supports the building’s [[Facades_and_interfaces|cladding and glazing]].
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Within the building Bourne Steel also [[Construction#Steel erection|erected]] stand-alone steel structures that create reception and public spaces at [[Single_storey_industrial_buildings#Mezzanines|mezzanine]] levels and a studio pod incorporating walkways. “These structures have been formed with steel as the client wanted flexible plug-in spaces that looked different to the rest of the surrounding building,” says Ms Bartram. Both of the two-storey [[Single_storey_industrial_buildings#Mezzanines|mezzanines]] are approximately 40m-long by 13m-wide, while the studio is a double-height space measuring approximately 10m by 8m.
 
{|class="wikitable" width="400"
|-
|'''Architect'''||PLP Architecture
|-
|'''Structural Engineer'''||Arup
|-
|'''Steelwork Contractor'''||Bourne Steel
|-
|'''Main Contractor'''||Mace
|-
|'''Main Client'''||Sky
|}

[[Category:Case studies - Multi-storey office buildings]]