Platform on concrete and steel in construction
Sustainable construction is the future. There is now little doubt about that. We want to waste fewer raw materials, reduce CO2 emissions, and use materials that have a lower environmental impact. This ambition is clear and widely supported within the sector. At the same time, that ambition also carries a risk: the temptation to rush into innovation before we’re certain that new solutions will prove themselves in practice. After all, how sustainable is a structure that fails prematurely? What do we gain from innovative materials if they later lead to damage, repair costs, and a loss of trust? Sustainability isn’t just about the origin of materials or circularity—it’s also about reliability, safety, and lifespan.
A recent example makes this painfully clear. At an apartment complex on Mozartlaan in Voorhout[1] Residents had to leave their homes after cracks appeared in the walls and facades. Plaster was peeling off and tiles were falling from the walls. An investigation revealed that the problems were related to the use of eco-blocks, a sustainable alternative made of cement, sand, and aerated concrete granulate—a recycled concrete product. On paper, it seemed like a logical and environmentally conscious choice. In practice, however, the reality was quite different. The blocks absorbed a great deal of moisture, causing them to shrink and expand to an exceptional degree. The resulting stresses led to cracking and structural damage. The result: a complex that is uninhabitable for an extended period, with all the consequences that entails.
And those consequences go beyond technology alone. Residents lose their homes and live for months, if not years, in uncertainty. Housing authorities see their properties stand vacant at a time when there is a severe housing shortage. At the same time, repair costs are rising and legal disputes over liability are arising. The decision to use a sustainable material thus results in exactly the opposite of what was intended.
Situations like these compel us, as an industry, to reflect. Innovation is essential—standing still is not an option if we want to achieve our sustainability goals. But not every innovation is automatically suitable for large-scale application. New materials may be environmentally friendly, but they may still lack sufficient proven performance in terms of structural behavior, durability, or maintenance requirements. This applies to residential construction, but certainly also to infrastructure projects. Bridges, viaducts, and other civil engineering structures must function reliably for decades. Unpredictable behavior, accelerated degradation, or a higher maintenance burden are simply unacceptable in these contexts. A structure is not a test setup. The end user must be able to rely on the fact that safety and performance are guaranteed.
That is precisely why we need to be vigilant. New materials deserve a chance, but only under the right conditions. Pilot projects and field trials are essential for understanding how materials behave under realistic conditions. Only when performance is demonstrably stable and risks are manageable is scaling up justified. This requires discipline throughout the supply chain. From manufacturers who are transparent about properties and limitations, to designers and clients who remain critical and do not base decisions solely on sustainability scores. And from regulators who allow room for innovation, but at the same time set clear requirements for safety and performance.
Sustainable construction is therefore not a choice between “green” and “solid.” It is a combination of both. A truly sustainable structure is not only circular or low-carbon, but also robust, safe, and able to withstand the test of time. Only then can you prevent short-term environmental gains from turning into long-term social and financial losses.
The pressure to become more sustainable is intense and understandable. But let’s make sure that pressure doesn’t lead to hasty decisions. Because if sustainable construction becomes a gamble, residents, users, clients, and the environment will ultimately pay the price.
[1] www.omroepwest.nl/economie/5116870/appartementen-nog-zeker-anderhalf-jaar-onbewoonbaar-vanwege-bouwfout
