NOVELTY - The water-proof membrane (1) comprises a barrier layer (2), and a solar cell (3), where the lateral surfaces (4) and the bottom face (5) of the solar cell are surrounded by the barrier layer and 1-3% of the top face of the solar cell is additionally surrounded by the barrier layer, so that the lateral surfaces and the bottom face of the solar cell are protected against the liquids on the top face of the solar cell. An intermediate space is formed between one of the lateral surfaces or the bottom face of the solar cell and the barrier layer.    USE - Water-proof membrane useful during introducing solar cell on roof sheeting.    ADVANTAGE - The water-proof membrane minimizes the detachment of the solar cells introduced on the roof sheeting, the formation of voids and the subsequent penetration of moisture, and ensures better protection of the solar cell against mechanical loads.    DETAILED DESCRIPTION - The water-proof membrane (1) comprises a barrier layer (2), and a solar cell (3), where the lateral surfaces (4) and the bottom face (5) of the solar cell are surrounded by the barrier layer and 1-3% of the top face of the solar cell is additionally surrounded by the barrier layer, so that the lateral surfaces and the bottom face of the solar cell are protected against the liquids on the top face of the solar cell. An intermediate space is formed between one of the lateral surfaces or the bottom face of the solar cell and the barrier layer. A unit for electrical connection is arranged in the intermediate space. The thickness of the solar cell amounts to 30-50% of the thickness of the barrier layer. An additional covering layer is applied on the top face of the solar cell. The transmission of the material of the covering layer is more than 85% measured with a covering layer thickness of 0.1 mm in a spectrum of 300-1300 nm. The barrier layer comprises a layer made of thermoplastic polypropylene or polyethylene. The barrier layer has a thickness of 1.2-2 mm. An INDEPENDENT CLAIM is included for a method for producing a water-proof membrane.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of a membrane.    Membrane (1)    Barrier layer (2)    Solar cell (3)    Lateral surfaces (4)    Bottom face. (5)