The invention relates to a sealing sheet with an upper layer consisting of an elastomeric material, a strengthening layer consisting of fibres, and a bitumen layer on the underside. The sheet is used for covering parts of buildings and roofs. An additional covering layer made of SBS, on the one hand, and EPDM, IIR or CSM on the other hand, and bitumen, is stuck to the upper layer. The constituents of the mixture for the covering layer have specific limiting values relative to one another.