While sustainability has been a long-standing goal, the construction industry is now pushing for carbon negativity.
More than aiming for zero emissions, it’s about creating buildings that function as ‘carbon sinks’. These structures actively remove more carbon dioxide from the atmosphere than they generate over their entire life cycle.
While ambitious, construction professionals can achieve it by adopting carbon-sequestering materials and revolutionising their construction methods.
Sizing up the building sector’s carbon footprint
The construction sector is responsible for 37 per cent of emissions worldwide. In addition, buildings account for 40 per cent of the planet’s carbon emissions because they require a significant amount of water and energy to build and to function.
Think of this not as a point of blame but as a massive opportunity. As a professional in a highly active industry, you’re in a prime position to help drive the innovation that will solve this challenge.
Building with carbon-sequestering materials
Materials like cross-laminated timber (CLT) form the first part of the solution. CLT is an active carbon sink. The wood naturally stores carbon absorbed by the tree during its growth. When used in a building, that carbon is locked within the building’s structure for its entire life. Engineered timber can reduce embodied carbon emissions related to construction by up to 75 per cent compared to conventional concrete and steel.
You can also significantly lower a project’s embodied carbon by specifying green concrete varieties. These mixes replace a high percentage of carbon-intensive cement with industrial byproducts, such as fly ash from coal-fired power plants and slag from steelmaking. They allow you to recycle waste into your build.
New methods for on-site reduction
Here are processes, technologies and standards that you can implement on-site to slash emissions.
Measuring hidden emissions
The industry’s focus is evolving from just operational efficiency to the hidden embodied carbon in projects. The National Australian Built Environment Rating System’s embodied carbon tool can be a game-changer for your work. It allows you to track emissions throughout construction, from the manufacturing of materials to the energy used and wasted on-site. This tool creates accountability, as what gets measured gets managed.
Leveraging technology for peak efficiency
Technology is your toolbox for managing the hidden emissions measured by the NABERS tool. For example, digital twins let you create a virtual replica of your projects to run energy simulations and detect issues before you build. This technique can help you avoid wasteful on-site fixes. You can also use drones for surveys to reduce vehicle trips and monitor progress with greater accuracy.
Meticulous techniques for the building envelope
The quality of your team’s on-site work is essential for long-term, carbon-free performance. For example, a well-built and well-insulated building envelope can lower the structure’s carbon footprint. That can involve insulating pipes and addressing all points where air can enter or exit. Every unintended gap is a source of energy loss for decades, so getting it right during construction has a massive cumulative impact on reducing operational carbon.
Achieving climate-positive and resilient buildings
Connect your on-site work to the certified, long-term goals that will define your projects’ success in the modern market.
Aligning with a climate-positive pathway
The Green Building Council of Australia sets the benchmark for leadership in this area with its Green Star Buildings rating system. It includes the Climate Positive Pathway that provides an actionable checklist to guide your project decisions. The goal is to deliver structures that are 100 per cent fossil-free, powered by renewable energy, highly efficient and built with lower-carbon materials.
Building for resilience as a carbon strategy
Given Australia’s climate, building for resilience against floods, fires and heat should be a primary concern for any project you undertake. Design structures that can withstand the effects of climate change and natural disasters. They won’t require carbon-intensive repairs, making your initial investment in resilience a long-term carbon win.
The future of carbon-negative construction in Australia
The path toward carbon negativity for your projects is a holistic one that combines sustainable materials, methods and frameworks. While you may face challenges such as costs and supply chain logistics, the long-term operational savings and market demand for verifiably green buildings create a strong business case. Adopting these structures is a significant opportunity for construction professionals to create a more sustainable environment.