Waterproofing membrane with a solid filler component

A membrane comprising

• a barrier layer S1 having a first and a second opposing surface and
• a contact layer S2 having a first and a second opposing surface,
• wherein
• at least a portion of the first surface of the barrier layer S1 and the second surface of the contact layer S2 are directly bonded to each other,
• the barrier layer S1 has a thickness that is in a range of 0.1-10.0 mm,
• the barrier layer S1 comprises a thermoplastic polymer component P1,
• the first surface of the contact layer S2 has a 3D-average roughness that is in a range of 10.0-500.0 μm,
• the contact layer S2 comprises a mixture including a solid filler component F and a thermoplastic polymer component P2, and
• the amount of the solid filler component F is in a range of 10.0-90.0 wt.-%, based on the total weight of the contact layer S2.