Abstract: The invention relates to building elements and building constructions, and more particularly to building systems which utilize compressed blocks made of a fibrous material in conjunction with a framework in order to form building constructions for buildings and structures. The present building element consists of a block 2 made of a fibrous material, and forming elements which are disposed on the surfaces of the block and consist of a pair of frames 3 interconnected by at least one transverse brace 4 to form a single structure. The building element also comprises a forming mesh 5, which is disposed between the fibrous material block 2 and the frames 3, on top of the transverse braces 4 that connect the frames 3; outer and inner walls 6, which are fastened from the outer sides of the frames 3; and membranes 7, which are disposed between the walls 6 and the frames 3. The outer contour of the frames 3 comprises curvilinear jigsaw-like locking elements.