Abstract: A method for applying a self-adhesive waterproof membrane to an external wall and base slab of an underground construction prior to the casting work includes applying a concrete layer on a working site and a protective layer on a diaphragm wall or retaining wall of the external wall, applying a rubbery asphalt waterproof membrane on the concrete layer and the outside of the protective layer. A rubbery asphalt layer of the membrane is facing directly to the underground structural body. A step of applying a protection concrete on the membrane that is applied on the concrete layer is added after the rubbery asphalt membrane applied step. Then, applying a steel frame or reinforcing steel to adjacent membrane and a formwork to an inner face of the external wall is added.