Australasian Timber

Hybrid sandwich of wood, concrete

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Metsä Wood and its partners have designed a hybrid sandwich wall element, which will renew offsite constructi­on.

The innovation combines concrete with Kerto® LVL (laminated veneer lumber). The lighter weight of the hybrid sandwich wall elements proved to be a valuable benefit in the first constructi­on project at Metsä Fibre’s Rauma sawmill.

Skanska, the constructo­r of Metsä Fibre’s new Rauma sawmill, has set up ambitious goal for itself as it aims to be carbon neutral globally by 2045. This has led the company to provide lowcarbon or carbon neutral life-time solutions to its customers.

The production of the new hybrid sandwich wall elements, which are used in the sawmill’s log sorting building, went as planned at the precast element manufactur­er Lipa-Betoni’s factory.

In the production of a hybrid sandwich wall element, a Kerto LVL panel forms the load-bearing core. This is followed by an insulation layer and reinforced concrete facade.

The installati­on of the hybrid sandwich wall elements for the first floor, 100 m2, of the building took five hours.

Both kinds of elements have identical connection­s in the bottom, and the seams of the hybrid sandwich elements have timber screws. He also highlights that after the assembly of hybrid sandwich wall elements, the seams are finished and there is no need to do seaming, concrete grinding or cleaning, as is the case with concrete sandwich panels.

The sorting building will be ready by the end of 2021. The sawmill is planned to be ready in Q3 2022.

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