The invention is directed to a membrane used in waterproofing and roofing applications, the membrane comprising a barrier layer S1 comprising a thermoplastic polymer component P1 and a contact layer S2 bonded to at least portion of the barrier layer S1, the contact layer S2 comprising a mixture of a solid filler component F and a thermoplastic polymer component P2. The invention is also directed to a method for producing the membrane, a method for waterproofing a substrate, to a waterproofed construction, to a method for sealing a substrate against water penetration and to a sealed construction for sealing a substrate against water penetration.