Light steel building waterproof parapet and construction method thereof

The invention provides a light steel building waterproof parapet and a construction method thereof. A wall frame of a wall body and a truss of a building top roof are formed by light steel keels; thecenter of the wall body is filled with glass heat preservation cotton; a cold-formed thin-wall light steel keel wall body serves as a wall body structure; an OSB plate is used as a structure reinforcing plate and wall surface leveling plate; glass heat preservation cotton is a wall surface heat preservation layer; an extruded sheet is a roof insulation layer; one-way breathing paper is a damp-proof layer; a fiber cement board is a main waterproof layer outside the parapet; a PVC waterproof roll is a main waterproof layer on the roof and inside the parapet wall; the inner side face of an opening, inside the parapet wall, of the water falling hopper is continuously sealed and pasted through a waterproof roll cutting opening in an inward turning mode. According to the method, quick construction is achieved through a full-dry method, the effect of preventing water leakage is good, the water leakage and seepage phenomenon can be eradicated for a long time, and the overall construction costis effectively reduced.