The present invention relates to a wall element (10) comprising an upper edge element (21) and a lower (22) edge element, and two side elements (/25, 26) between the upper and lower elements. A rectangular board (27) covers the elements. The edges (23, 24) of the upper and lower elements are arranged at an angle alph with respect to a plane P perpendicular to an outer surface of the panel. The angle alpha lies within the interval 20 degrees to 45 degrees. The invention further relates to a wall section comprising at least two wall elements and a method for building the wall section.