Advanced Pilkington UK glazing systems help landmark Cardiff building achieve BREEAM excellent rating

 

One Central Square in the centre of Cardiff is the first building to be completed in a new mixed-use regeneration scheme, with the help of Pilkington UK Ltd.

 

The project set out to create the highest quality office space in Wales, and energy efficiency was a key part of the plan. A key aim for the building was to achieve the coveted ‘Excellent’ rating under the Building Research Establishment Environmental Assessment Method (BREEAM).

The assessment takes into account a wide range of sustainability criteria, but energy performance is one of the most heavily weighted when a project is graded.

For Rio Architects, achieving a high level of natural light within the building was also extremely important. This meant specifying a high-performance glass that was not only energy-efficient, but also lacked any visible tinting.

Steve Berry, sales manager at Pilkington United Kingdom Limited, said:

“To take advantage of its prime location, the Rio team wanted to maximise the 360-degree views of Cardiff by glazing the building floor to ceiling on all sides. The building is surrounded by 6,130m2 of glazed units, so the performance of the glass was absolutely critical to the project’s overall energy usage and the ease with which the interior can be climate-controlled.”

The challenge with entirely glazed buildings is to ensure that excess heating from sunlight doesn’t make the building too reliant on air conditioning during the summer, and that the glazing doesn’t allow too much energy to escape during the colder months.

In order to control the amount of energy coming into the building, a Pilkington Insulight™ Sun double glazed system was used.

The outer pane is Pilkington Suncool™ 66/33 T– a toughened glass that rejects 64 per cent of the sun’s energy while allowing twice as much daylight in. It also has the additional benefit of thermal insulation. The inner pane was Pilkington Optifloat™ – a high-quality standard float glass – and the two were separated by a 16mm argon-filled cavity to provide enhanced insulation.

The majority of the glazing was constructed as a curtain wall using architectural aluminium systems from American manufacturer Kawneer. However, for the double-height atrium, the Pilkington Planar™ structural glazing system was used, creating frameless glazed surfaces to maximise the sight-lines through the building and minimise its impact at street-level.

This met Rio’s design requirement for a high level of transparency along the public boulevard connecting Millennium Stadium to Cardiff's Central Station, which was an integral part of the original concept.

Open and inviting

Surrounding the atrium are 130m2 of double glazed units, held in place by low-profile stainless steel fixings and perpendicular glass fins, creating an uninterrupted wall of glass. The toughened fins are 19mm thick and ensure the glazing will stand up to high wind loads.

To prevent the risk of overheating as a result of excessive solar gain, again, Pilkington Suncool™ 66/33 T was used for the outer pane of the units.

Steve Berry added:

“The structural glazed façade at ground level really enhances the sense of space both inside and outside the building, making it open and inviting despite its height.”

Tom Roberts, Senior Transactions Manager at Legal & General Investment Management Real Assets at Legal & General said:

“One Central Square securing the BREEAM Excellent rating is an important achievement, and we see the sustainability of the scheme as a significant selling point. The glazing Pilkington has provided is not only one of the building’s defining features, but it has also allowed us to deliver on our energy performance targets.”

When complete, the wider Central Square scheme will also house a 14,000 sq m headquarters for BBC Wales.

 

Notes

NSG Group, the manufacturer of Pilkington glass in the UK, manufactures a wide range of float, coated, rolled, laminated and toughened glass products as well as its own range of high-performance insulating glass units. Glass is distributed direct to customers, either as stock or as bespoke processed products to meet their needs, either direct from St Helens or through its network of branches countrywide. The company is highly focused on quality and service, continually improving to deliver the benefits of the NSG Group's technical ability and innovation to the end user. Find out more at www.pilkington.co.uk.  

  • British Glass represents the interests of primary glass manufacturers and the glass supply-chain, from raw materials to retail and the end-consumer" credits="n/a" >
  • Modern life would not be possible without glass
    But, what is this amazing substance, where does it come from and how is it made?" credits="n/a" >
  • Find a reputable supplier from our member directory" credits="n/a" >
  • Learn about the different methods of manufacturing glass in our information section" credits="n/a" >
  • Did you know that Glass is 100% recyclable and can be recycled an infinite number of times without loss of quality, strength or functionality?" credits="n/a" >
  • We provide relevant, impartial, and comprehensive advice and information - from leading experts across key legislative areas" credits="n/a" >
  • British Glass represents the interests of primary glass manufacturers and the glass supply-chain, from raw materials to retail and the end-consumer" credits="n/a" >
  • Learn about the amazing material glass" credits="n/a" >
  • British Glass represents the interests of primary glass manufacturers and the glass supply-chain, from raw materials to retail and the end-consumer" credits="n/a" >
  • Our enviromental section goes into more depth on the environmental and energy issues affecting the glass supply chain" credits="n/a" >

 
 

On average, every family in
the UK uses around 330 glass
bottles and jars each year.


British Glass - Twitter

RT @guardianglass "We are moving to help architects and designers realize their expansive glass vision, while working w/ our fabricator cu…

RT @CumbriaCrystal Make someone’s January Special! If you nominate someone special to win an artisan-crafted piece of @CumbriaCrystal they…

RT @iom3 Dozens of pioneering new research projects announced as EPSRC welcomes Year of Engineering https://t.co/tFmjZNkg3R

Today we're at Westminster Energy, Environment & Transport Forum seminar - making a #CircularEconomy by working on… https://t.co/rvzaYf41nE