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The present invention concerns a columns assembly for an insulating wall of a building structure, said column having a side surfaces adapted to receive and retain insulation panels of the insulating wall, said column assembly comprising an inner spacer element made of mineral wool fibers, a central

The present invention concerns a columns assembly for an insulating wall of a building structure, said column having a side surfaces adapted to receive and retain insulation panels of the insulating wall, said column assembly comprising an inner spacer element made of mineral wool fibers, a central element made of mineral wool fibers, an outer spacer element made of mineral wool fibers, wherein the spacer elements are assembled with first and second intermediate profiles between the spacer elements, and wherein the density of the mineral wool in the central element is higher than the density in the inner and outer spacer elements. The invention also concerns an insulating wall assembly of a building structure with such a column assembly and a method of constructing such insulating wall.

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1. A column assembly for a substantially thermal bridge free insulating wall of a building structure, said column assembly having side surfaces adapted to receive and retain insulation panels of the insulating wall, said column assembly comprising: an inner spacer element made of mineral wool fibres

1. A column assembly for a substantially thermal bridge free insulating wall of a building structure, said column assembly having side surfaces adapted to receive and retain insulation panels of the insulating wall, said column assembly comprising: an inner spacer element made of mineral wool fibres;a central element made of mineral wool fibres;an outer spacer element made of mineral wool fibres;wherein the spacer elements are assembled with first and second intermediate profiles between the spacer elements, and wherein the density of the mineral wool in the central element is higher than the density in the inner and outer spacer elements, whereby a substantially thermal-bridge-free load bearing column is provided. 2. A column assembly according to claim 1, wherein the column assembly provides a thermal performance of Ψ≦0.00499 W/mK. 3. A column assembly according to claim 1, wherein the central element is thinner than the inner and outer spacer elements. 4. A column assembly according to claim 1, wherein the inner spacer element is provided with an innermost mounting element for supporting a mounting of an inner wall finish. 5. A column assembly according to claim 4, wherein the innermost mounting element is made of plywood. 6. A column assembly to claim 1, wherein the outer spacer element is provided with an outermost mounting element for supporting a mounting of an external building facade cladding. 7. A column assembly according to claim 6, wherein the outermost mounting element is wider than the outer spacer element. 8. A column assembly according to claim 1, wherein the first and second intermediate profiles are made of steel or of a bent steel sheet. 9. A column assembly according claim 1, wherein the central element has a density of 300-600 kg/m3 or of approx. 500 kg/m3. 10. A column assembly according to claim 1, wherein the inner and outer spacer elements have a density of 70-100 kg/m3 or of approx. 90 kg/m3. 11. A column assembly according to claim 1, wherein the inner and outer spacer elements, the first and second intermediate profiles and the central element are symmetrically assembled about a longitudinal axis. 12. A method of constructing an insulating wall comprising the steps of: providing a first column assembly according to claim 1 on a base structure;placing a middle insulation panel of mineral wool fibres abutting the central element of the first column assembly, and thenproviding a second column assembly according to claim 1 on the base structure and with the central element of said second column assembly fitted around the middle insulation panel;placing an outer insulation panel of mineral wool fibres between the outer spacer elements of two neighboring first and second column assemblies;installing a screen panel on the inside of the middle insulation panel; andplacing an inner insulation panel of mineral wool fibres between the inner spacer elements of two neighboring first and second column assemblies on the inside of the screen panel. 13. A method according to claim 12, further comprising the step of mounting an inner wall structure on inner mounting elements of the first and second column assemblies. 14. A method according to claim 12, further comprising the step of mounting an outer wall structure on outer mounting elements of the column assemblies. 15. An insulating wall assembly of a building structure, comprising: at least a base structure;a plurality of column assemblies;the column assemblies each having first and second side surfaces, which are abutted by contact sides of a plurality of insulating panels fitted between two adjacent column assemblies, wherein the column assemblies each comprisean inner spacer element made of mineral wool fibres;a central element made of mineral wool fibres;an outer spacer element made of mineral wool fibres;wherein the spacer elements are assembled with first and second intermediate profiles between the spacer elements, and wherein the density of the mineral wool in the central element is higher than the density in the inner and outer spacer elements, whereby a substantially thermal-bridge-free load bearing column is provided. 16. An insulating wall assembly according to claim 15, wherein the wall assembly provides a U-value of below 0.15 W/m2K, preferably 0.10 W/m2K. 17. An insulating wall assembly according to claim 15, wherein an inner, a middle and an outer insulation panel of mineral wool fibre insulation panels are provided between the column assemblies, and wherein the middle insulation panel is abutting the central element of the column assemblies and retained between the intermediate profiles on the column assemblies. 18. An insulating wall assembly according to claim 17, wherein the middle insulation panel has a higher density than the inner and outer insulation panels, the middle insulation panel having a density of 60-80 kg/m3and the inner and outer insulation panels have a density in the range of 35-50 kg/m3. 19. An insulating wall assembly according to claim 17, wherein a screen panel is disposed between the middle insulation panel and the inner insulation panel.