Building panels of solid wood

A set of building panels, each building panel comprising an upper first element of solid wood fixed to a lower second element of solid wood, the upper first element and the lower second element are of different wood species, the building panels provided with a mechanical locking system which comprises a locking strip at a first edge of a first building panel, the locking strip provided with a locking element configured to cooperate with a locking groove at a second edge of a second building panel for horizontal locking of the first and second building panels when a tension force is applied to the first and second building panels, wherein a fibre direction of the upper first element and the lower second element is essentially along the first and the second edges, a toughness of the lower second element is higher than a toughness of the upper first element, and the locking strip comprises material of the second element.

A set of building panels, each building panel comprising an upper first element of solid wood fixed to a lower second element of solid wood, the upper first element and the lower second element being of different wood species, and the lower second element being a single unitary piece of wood, the building panels provided with a mechanical locking system which comprises a locking strip at a first edge of a first building panel, the locking strip provided with a locking element configured to cooperate with a locking groove at a second edge of a second building panel for horizontal locking of the first and second building panels when a tension force is applied to the first and second building panels, wherein a fibre direction of the upper first element and the lower second element is essentially along the first and the second edges, the lower second element having about the same or a higher moisture shrinkage value than the upper first element, and the locking strip comprises material of the lower second element.