The invention relates to a process for sticking edging material (10, 12) onto lightweight building boards (1) comprising two thin-walled outer layers (2, 4) and a core layer (6) of lightweight filler material disposed between the outer layers (2, 4), having the steps: provision of a lightweight building board (1), a decor edge (10) and a stabilizing edge (12), and sticking on of the decor edge (10) and/or the stabilizing edge (12) in the region of a narrow surface (1′) of the lightweight building board (1). The process according to the invention is characterized in that at least the stabilizing edge (12) comprises a synthetic fiber material, preferably a cellulose-based fiber material, particularly paperboard material.