The membrane is fixed to the structure mechanically with special screws in the light flat roofs where statically no additional load is allowed. The stone wall layer, laid on the corrugated steel sheet is covered with Lineflex membrane. The membrane band with a width of 1,5 m is fixed to the deck sheet by mechanical fixing with stone wool from the edge without welding band. The membrane’s edge, fixed mechanically, is closed with 15 cm bini width with the next membrane band. The binis are welded with hot air. The membrane edges not having side thermic welding band are united with thermic bands or special adhesive.