BRICKS & BLOCKS
WHY IT’S TIME TO MOVE ON FROM CONCRETE BLOCKS The construction industry has a reputation for being one of the biggest polluters; it’s responsible for 40% of the world’s carbon emissions. It’s clear that if we are to fight climate change and promote sustainability, construction will need to clean up its act. One of the best ways of doing so is cutting demand for one of the most common building materials: concrete. The key ingredient of concrete is cement which has a large carbon footprint, even higher than aviation fuel, says Charlie Ayers, Founder of SureCav. SURECAV
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or years, concrete has been a popular choice within the construction industry due to its strength and versatility, and it’s rare to find any modern buildings without it. However, new innovations within the sector mean that it should be easier than ever to wean architects and contractors off their concrete dependence. Fortunately, there is an appetite for change, and in a rapidly evolving construction landscape, housebuilders and developers are increasingly looking to new products and materials to help meet ambitious net-zero carbon targets. One of the most common uses of concrete is concrete backing blocks within a cavity wall. It’s a perennial system as it provides both structural sturdiness and a good level of insulation. However, new developments in building products have removed the need for the first layer of backing blocks. It is possible to replace them with thin sheets of recycled polypropylene and still achieve the same, or better, performance as concrete. The production of these plastic FC&A – OCTOBER – 2020
sheets has a far lower carbon footprint than that of concrete. In fact, it can reduce the carbon footprint of cavity construction by up to 50%. Moving forward, the circular economy will continue to gain importance as the industry tries to minimise its impact on the environment in as many ways as possible. As a recycled material, these panels also help to remove the amount of virgin plastic within the industry, getting us that step closer to net-zero 2050. Another ecological bonus from using recycled plastic sheets rather than concrete blocks is their weight. The equivalent amount of polypropylene is far more lightweight and takes up less room than a hefty block of concrete. It is; therefore, much simpler to transport, as you can deliver the equivalent of 40 tonnes of concrete in the back of a single pick-up truck. 26
The benefits of replacing concrete with polypropylene panels do not stop at a building’s construction either. I have always said that when it comes to building a property, it’s likely that you are building a structure that will last well over a hundred years, so it needs to be done properly. When a building lasts that long, its operational emissions can easily overtake the carbon footprint from the materials’ production. Of the construction industry’s 40% share of global emissions, 28% of that is from operational emissions alone. This means it needs to be as efficient as possible.
