18 1 TRITON SQUARE, LONDON
© Simon Kennedy
© Simon Kennedy
“We chipped away at every aspect of the building to save carbon, cut waste and deliver the best working environment”
The data emerged from assessing the embodied and operational carbon footprint of the building over the 20 year period and referenced this against a “business-as- usual scenario” to establish the carbon savings. “We chipped away at every aspect of the building using our collective expertise to save carbon, cut waste and deliver the best working environment,” explains Lazzarotto. He adds: “every possible system, component and strategy was analysed and refined to improve performance and deliver the most sustainable outcome.” Significant ‘marginal gains’ included positioning the stair cores outside of the building’s thermal line – enhancing efficiency and airtightness. Low energy LED lighting and energy ventilation systems, as well as hybrid air source heat pumps, contribute to the building’s low energy usage. In addition, where feasible, existing columns were strengthened with carbon fibre wraps, taking up to 58% less area than a standard twin column solution and increasing the axial load capacity by 40%. Lastly, the more sustainable cement replacement used contributed to 41% less carbon than standard concrete.
Conclusion © Simon Kennedy
The redevelopment of 1 Triton Squareis an exemplary piece of integrated architecture and engineering which prioritises retention of structure and fabric, and one where the team has reunited to improve on its original design, and achieve an important sustainability result.
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The project relied on the wide experience of Arup, Lendlease, Permasteelisa and Gartner, and the “innovative approaches that the whole team adopted,” explains Lazzarotto. “The requirement was to produce a building that had much higher ambitions around sustainability, carbon and energy usage than the original,” says Lazzarotto. However, he asserts that Arup’s objective was also to create a “wonderful building” to be in, with good daylight, and enjoyable spaces in which to work and circulate.
The decision to refurbish large sections of the existing building based on circular economy principles represents a challenge to the industry status quo in terms of sustainability approaches. There arguably remains a widely-held perception that new structures are more sustainable than regenerated buildings. However, Arup has investigated the carbon savings achieved by choosing to retain and renew the structure, finding a 45% reduction in emissions in construction and operation – i.e. whole life carbon – versus a typical new build alternative. Overall, the building has contributed to
an estimated CO2e savings of 40,000 tonnes – equivalent to powering 9,900 average UK houses for a year. Of this, just under 25,000 tonnes was embodied carbon with the remaining saving in operational carbon over 20 years of the building in use. Arup concludes: “This achievement would not have been possible without this partnership, and the collective vision of Arup, British Land and Lendlease.”
ADF NOVEMBER 2021
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