Four Companies Found KLARK AG for CO2-Neutral Concrete

(CONNECT) Four construction companies from Switzerland have joined forces to found KLARK AG, based in Landquart GR, on August 25, 2025: Ulrich Imboden AG from Visp VS, Logbau AG from Maienfeld GR, Novakies AG from Rapperswil BE and Toggenburger AG from Winterthur. Their common goal is to make KLARK concrete, which is CO2-neutral thanks to the addition of biochar, available throughout the country.

In a press release, they describe the founding of KLARK AG as a milestone for the Swiss construction industry: "It shows that ecological responsibility, economic thinking and cooperative structures can go hand in hand - even and especially in an industry that has long been considered sluggish." KLARK stands for a move towards a building materials market "that not only measures climate effects, but actively changes them". This is "industrial innovation instead of individual battles".

The KLARK climate clay is mixed with as much biochar made from untreated waste wood from regional forestry until a CO2-neutral product is created. According to the information provided, it has the same properties as traditional concrete, which causes CO2 emissions of up to 250 kilograms per cubic meter. The CO2 reduction performance is verified with a verified life cycle assessment in accordance with KBOB balancing rules. The life cycle assessment results are published on the "KBOB list".

Eberhard Bau AG from Kloten ZH, Aarebeton Aarau AG and Arnold & Co. AG Sand- und Kieswerke from Flüelen UR are already on board as licensees for the production of KLARK concrete. "This will create a central competence center for CO2-saving construction with concrete, supported by regional pioneers with national reach," the press release states. ce/mm