Patent ID: 7037593

Claim:
A waterproofing membrane comprising a first layer of fibers having a) a first face with an antisweating coating thereon, wherein the first face can form a top face of the membrane when applied on a roof, and, opposing the first face, b) a second face with a bituminous mass thereon, comprising bitumen, in an amount of 15–85% by weight of the total bituminous mass, and polymers, comprising isotactic polymers, atactic polymers at an amount of 5–85% by weight of the polymers, and olefinic polymers having intrinsic crystallinity and forming at least 1% by weight of the polymers, the olefinic polymers comprising a polyethylene having monomers where the carbon number is greater than three, the atactic polymers having a first fusion zone extending continuously within a first temperature range situated between 135 to 163° C. and a second fusion zone extending continuously within a second temperature range of 81 to 103° C. and the olefinic polymers having a fusion zone extending continuously within a third temperature range of 45 to 110° C., for each of said polymers an enthalpy-related change occurs over the whole range of the respective fusion zone and reaches a maximum within the respective temperature range.