The waterproofing bitumen membrane IZOSELF is used to carry out the waterproofing of basements against moisture, in multi-layer waterproofing systems of underground structures against water pressure, in case the second layer of waterproofing is fully torched and in two or more layered flat roof systems as base or intermediate layer. The membrane is installed in such a way that during unrolling the easy removable siliconized film is removed while pressing it at the same time to the surface. To achieve immediate adhesion hot air or a flame is used at installation of the membranes to increase adhesiveness. The multi-layer waterproofing systems IZOSELF membranes are used in combination with IZOELAST torch applied membranes. The membrane is protected on one side with easily removable siliconized film, on the other side with easily fusible polymeric sheeting. The product is in accordance with SIST EN 13969 for type A and type T, with SIST EN 13707 for the base layer and with SIST 1031.