of the flexible barrier 22 the underside of flexible barrier 22 is the side opposite to the side to which the scrim 23 and thermoplastic adhesive 24 are attached it is the side that typically faces the floor during installation rigid strips 21 and 21 u2032 may also be adhered to the upper surface of flexible barrier 22 between scrim 23 and flexible barrier 22 or in the alternative on the upper surface of scrim 23 a variety of suitable adhesives may be used to adhere rigid strips 21 and 21 u2032 to flexible barrier 22 for example pressure sensitive adhesives epoxies latex and acrylic adhesives may be suitable preferably rigid strips 21 and 21 u2032 are extruded directly onto flexible barrier 22 where they bond to the barrier while molten eliminating the need for an adhesive in the alternative flexible barrier 22 and rigid strips 21 and 21 u2032 are made from the same material and extruded together as a single piece the invention will function with placement of rigid strips 21 and 21 u2032 either below flexible barrier 22 or above it and the determination of desired placement will be a trade off between various considerations for example placing the rigid strips 21 and 21 u2032 above flexible barrier 22 between.