As someone deeply involved in Australia’s precast concrete industry, I’m continually surprised at how rarely whole-of-life performance is considered when choosing construction materials. (above image credit Martin van der Wal)

The focus is often squarely on upfront embodied carbon. Whilst this is important,  it misses the bigger picture. What happens over the life of a building? How much energy will it consume? How often will it need maintaining, repairing or replacing?

If we’re serious about reaching Australia’s net zero goals, we need to rethink how we measure impact. And in that conversation, precast concrete quietly makes a compelling case.

The Right Start

Yes, we acknowledge that cement carries a carbon cost. But used intelligently, precast concrete can reduce embodied carbon by up to 20% compared with cast in-situ concrete — and often fares better than steel or timber across the full lifecycle. The advantage lies in how it’s produced.

Manufactured locally in factory-controlled environments — often close to construction sites — precast uses local materials such as sand, aggregate (gravel) and water. This reduces transport emissions and allows for more efficient delivery scheduling. It also means fewer vehicle movements and less congestion as well as improved safety around building sites.

A Major Win on Waste

The construction and demolition sector is one of Australia’s largest sources of waste. According to the National Waste Report 2022, Australia generated 75.8 million tonnes of waste in 2020–21. Of this 25.2 million tonnes was attributed to building and demolition materials — roughly a third of the national total.

This is where precast offers a major advantage. Its factory production model allows for precise casting, formwork reuse and recycling of materials like steel, water, and even concrete offcuts. On site, the result is cleaner operations with less packaging, less debris, and far fewer overruns or rework.

It’s a circular approach — and one that’s already delivering.

Notably, the report also identifies 12 million tonnes of ash — mostly from coal-fired power stations — as another significant waste stream. This ash is often difficult to repurpose, but here’s where the precast industry plays a part in the solution.

Many precast manufacturers incorporate fly ash, a by-product of coal combustion, into their concrete mixes. Used as a partial replacement for cement, fly ash not only reduces the need for virgin materials but also enhances the performance and durability of the concrete. It improves workability, makes the concrete more resistant to chemical attack, and reduces the risk of cracking. All of this while helping divert industrial waste from landfill.

By giving ash a second life, precast contributes to the circular economy and transforms an environmental challenge into a valuable construction input.

Built to Last

If we’re honest with ourselves, too many buildings are still being designed to be demolished in a few decades. Precast flips that equation. It’s inherently durable, resistant to fire, floods, termites and corrosion. Many structures built with precast are still standing strong after 100 years or more.

And because precast construction is so precise and modular, these buildings can be more easily adapted or repurposed as community needs change, without needing to be knocked down and rebuilt. That’s fewer materials, less energy use and lower embodied carbon across the full building lifecycle.

Less Energy Over Time

We must also look at operational energy. Precast concrete’s high thermal mass means it absorbs heat and releases it slowly, naturally moderating indoor temperatures. This can reduce a building’s energy use for heating and cooling by up to 25% over its lifetime.

This isn’t speculative. We see it in passive design principles and in actual building performance data. Compared to lightweight materials like timber — which require added insulation — or steel, which contributes to thermal bridging, precast supports a more energy-efficient envelope from day one.

Smarter, Leaner Design

Advances in precast technology continue to reduce raw material use while maintaining strength and durability. Take hollowcore planks, for instance, which are designed with internal voids that significantly reduce the amount of concrete required. Or prestressed elements… that span greater distances, reducing the need for additional beams and supports.

And thanks to digital design tools and factory precision, precast supports lean construction and Design for Manufacture and Assembly (DfMA) principles, further streamlining materials and labour use.

Many precast mixes now incorporate recycled materials — not only by-products like fly ash and slag, but also recycled steel and aggregate. Some components are even designed to be disassembled and reused on other sites, supporting a circular construction model.

Quietly Absorbing Carbon

What even industry professionals sometimes overlook is that precast concrete doesn’t just emit carbon. It also reabsorbs it over time.

Through a natural process called carbonation, concrete gradually takes in CO₂ from the atmosphere, forming calcium carbonate. Over a structure’s lifespan, precast can reabsorb 20–30% of the CO₂ emitted during its manufacture, a fact that is increasingly acknowledged in global sustainability frameworks.

The Bigger Picture

Precast isn’t perfect. But it is smart. It’s locally produced. It’s incomparably durable. And it delivers significant environmental returns over the long haul.

If we are serious about building more sustainable, climate-resilient cities — and about doing it quickly and cost-effectively — precast must be part of the conversation.

It’s not just a product. It’s a system. And in the race to net zero, that system may well be the missing link we’ve been looking for.

Sarah Bachman is CEO of the National Precast Concrete Association Australia

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