Did you know that Loctite technology bonds were crucial in sticking stone and steel together in the Sagrada Familia temple’s 826 panels? At 172 metres tall, it is the world’s highest temple and was last week blessed by Pope Leo XVI.
For Antoni Gaudí, finishing the Sagrada Familia was always a question of time, not imagination. He knew exactly what the six central towers should look like. What he did not know was that, more than a century later, technology would prove him right.
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The towers have now been completed, just in time for the centenary of the legendary Spanish architect’s death. But behind this visual milestone there is a protagonist few would expect to find in a cathedral of such scale: an adhesive. Specifically, Loctite EA 9497 fromHenkel (source in Spanish), the element that has made it possible for stone and steel to behave as a single material.
The challenge was enormous. The towers have been built using a modular system of prestressed stone panels, 826 in total, incorporating more than 2,100 stone elements joined to metal structures. Each panel requires around 30 kilos of adhesive. In all, 24 tonnes applied in liquid form, able to fill every cavity and secure the joint before a curing process of around 24 hours begins.
Up to 100,000 people per square metre
The result is not only aesthetic, but structural as well. The bond withstands loads equivalent to 100,000 people per square metre, the full capacity of a stadium such as Camp Nou, or the weight of 1,600 African elephants. A figure that explains why the Tower of Jesus Christ, the tallest in the complex, can support the large cross that crowns it without compromising a single millimetre of stability.
In this respect, the surroundings also matter. The basilica is just over two kilometres from the Mediterranean, exposed to constant salinity and a permanent risk of corrosion. And underground, two metro lines send constant vibrations through the entire structure.
The collaboration between Henkel and the Sagrada Familia did not start yesterday. The relationship has been established for more than a decade, with tests exceeding usual standards and a logistics supply chain that has had to adapt to something rare in the construction world: a project funded solely by its visitors’ contributions, with no fixed timetable or final budget.
The tallest temple in the world
The outcome of all this is already part of history. At 172.5 metres, the Sagrada Familia is now the tallest religious temple in the world, ahead of Ulm Minster in Germany.
“This project highlights how innovation and collaboration continue to drive progress,” says Adrián Orbea, president of Henkel Ibérica. The phrase, who knows, might well have been penned by Gaudí himself if he had had another century ahead of him.
