A sealing element (1, 1') for preventing heat radiation through gaps between heat insulation panels, which sealing element (1, 1') is made of a single piece of metal or metal alloy, wherein the sealing element (1, 1') comprises - a first elongated plate section having a longitudinal direction and a first edge and a second edge, said first and second edges extending in said longitudinal direction, - a second elongated plate section facing the first plate section and having a longitudinal direction parallel to the longitudinal direction of the first elongated plate section and a first edge and a second edge, said first and second edges extending in said longitudinal direction, - a first edging that is arranged on the first edge of the first plate section and points away from the second plate section, - a second edging that is arranged on the first edge of the second plate section and points away from the first plate section, and - a third edging that is arranged on the second edge of the first plate section on the same side as the first edging and points away from the second plate section, the second edge of the second plate section being connected to the second edge of the first plate section via the third edging, and the edgings (1c, 1d, 1e) being configured to work as springs that clamp the sealing element (1, 1) to an insulation panel, characterized in that at least the first edging and the second edging are inclined towards a longitudinal center line of the first or the second plate section (1a, 1b) that extends in the longitudinal direction. - a first elongated plate section having a longitudinal direction and a first edge and a second edge, said first and second edges extending in said longitudinal direction, - a second elongated plate section facing the first plate section and having a longitudinal direction parallel to the longitudinal direction of the first elongated plate section and a first edge and a second edge, said first and second edges extending in said longitudinal direction, - a first edging that is arranged on the first edge of the first plate section and points away from the second plate section, - a second edging that is arranged on the first edge of the second plate section and points away from the first plate section, and - a third edging that is arranged on the second edge of the first plate section on the same side as the first edging and points away from the second plate section, the second edge of the second plate section being connected to the second edge of the first plate section via the third edging, and the edgings (1c, 1d, 1e) being configured to work as springs that clamp the sealing element (1, 1) to an insulation panel, characterized in that at least the first edging and the second edging are inclined towards a longitudinal center line of the first or the second plate section (1a, 1b) that extends in the longitudinal direction. the second edge of the second plate section being connected to the second edge of the first plate section via the third edging, and the edgings (1c, 1d, 1e) being configured to work as springs that clamp the sealing element (1, 1) to an insulation panel, characterized in that at least the first edging and the second edging are inclined towards a longitudinal center line of the first or the second plate section (1a, 1b) that extends in the longitudinal direction.