a third layer of non woven thermoplastic material on the second layer through a nip at a pressure between about 50 pounds per square inch and about 90 pounds per square inch application_number US 75270307 A description fig1 depicts a system for manufacturing a roofing underlayment in accordance with one embodiment of the present invention as shown in fig1 a system 100 for making a non slip roofing underlayment comprises an unwinding portion 101 a pre treatment portion 103 an extrusion portion 105 a lamination portion 107 and a windup portion 109 use of extrusion lamination facilitates the use of thermoplastic material in the underlayment to improve the tensile strength and weather resistance of the underlayment several embodiments of the present invention comprise a single pass of unwinding a layer 102 of woven material and conditioning the layer 102 for treatment using the unwinding portion 101 of the system 100 in one embodiment the woven material may be any thermoplastic including but not limited to a polyolefin e g polypropylene and polyethylene any cloth material and the like in another embodiment the woven thermoplastic is a 10 u00d7 10 polypropylene optionally the woven layer 102 enters the pretreatment portion 103 of system 100 where a surface of the woven layer 102 is pretreated to facilitate the acceptance of melted thermoplastic to be extruded upon the woven layer surface in one embodiment pre treating the surface of the woven layer 102 comprises oxidizing the surface in another embodiment pre treating the surface of the woven layer 102 comprises at least one of corona treatment plasma treatment flame treatment chemical priming and the.