The present invention relates to a wall element comprising an upper element extending along an upper edge, a lower element extending along a lower edge, a first and second side element each comprising a substantially rectangular cross section, the first side element extending along a first side between the upper and lower element, the second side element extending along a second side between the upper and lower element and a substantially rectangular board arranged on an outer side and attached to said the upper element, lower element and first side element. The upper and lower element comprise a first edge coinciding with the first side and a second edge coinciding with the second side, wherein the first and second edge are arranged in an angle with respect to a plane perpendicular to the outer side, and the first and second side elements extending parallel to the plane, perpendicular to the board and having a total extension in the plane corresponding to the extension of the upper and lower element in the plane, wherein the first side element bears against the board and the second side element extends from the inside of the wall element. The invention further relates to a wall section comprising the wall element and a method for building the wall section.