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Home Digital Construction Construction

Easy wins to reduce embodied carbon

July 19, 2022
in Construction, Digital Construction
Iman Abi Saab
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For a new building that is fully compliant with building codes, half of its carbon emissions are likely to be from embodied carbon. Today, about 40% of global energy rated emissions are due to buildings and construction, making the embodied element about 20%.

As populations rise and the trend of people moving to cities and major urban areas continues, it is estimated that around 230 billion square metres of new construction is required, highlighting the need to tackle embodied carbon.

“Fast reductions are required,” said Iman Abi Saab, Technical Director, Middle East Technical Excellence Leader, Mott MacDonald.

More than half of the embodied carbon for buildings is emitted in the early stages of a structures’ lifecycle – during the mining, manufacture and transport of raw materials or the construction process itself.

Whilst a lot of focus is being put into the early stages, more also needs to go into the decommissioning of a building and for recycling of materials, Saab said. This is “fundamental” for the circular economy and moving towards net zero, she said.

Ways to reduce embodied carbon include reuse of existing materials, reducing materials quantities, and becoming better at calculating carbon emissions and setting benchmarks. “Setting carbon metrics is as important as setting our energy performance metrics,” explained Saab.

During construction, carbon emissions can be further reduced by addressing location and using new methods of construction such as off-site manufacture and automation, as well as minimising waste. During use, retrofits can significantly cut energy use and improve efficiency within a building. At end-of-life, decommissioning and demolition needs to better reuse or recycle the major elements of a building.

Below is the audience Q&A session with all speakers from the Measuring & reducing carbon in construction track during the Construction Technology Festival. Speakers included:

  • Iman Abi Saab, Technical Director, Middle East Technical Excellence Leader, Mott MacDonald
  • Matthew Anthony, Asset Advisory Lead, AECOM – The importance of benchmarks for measuring embodied carbon
  • Lindsey Malcolm, Associate Director, Sustainability, AESG – Real application and impact of carbon calculators
  • José Francisco García, Senior Project Director, ACCIONA – Case study: Circular construction in a desalination plant
  • Pierre Piniau, General Manager, Milwaukee Tool MEA – Reducing onsite emissions: A cost-benefit analysis of implementing electric machinery
Tags: Construction MaterialsCTF2022Embodied carbonSustainability
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