Abstract: Methods and apparatus' for embossing a non-repeating design on a web of material are disclosed. The methods include the steps of passing the web of material between a first pair of embossing rollers and then between a second pair of reembossing rollers. The non-repeating design may be provided by varying the rate at which the reembossing rollers are rotated and/or by providing the second pair of reembossing rollers with a diameter which is a non-rational multiple of the diameter of the first pair of rollers.The apparatus' include means for carrying out the aforementioned methods.A novel web product is also disclosed.

Abstract: A laminate composition useful as a roofing membrane comprising a top and a bottom layer of plastic film bonded together by a modified bitumen material, the top layer of said laminate either containing or being surface coated with an ultraviolet light resistant and absorbing agent. The inventive laminate has superior elongation and flexibility properties compared to prior art roofing membranes. Additionally, the inventive laminate is light weight and has good aesthetic qualities.Also provided are a novel embossed laminate, also useful as a roofing membrane, and a novel roofing system comprising a plurality of partially overlapping inventive roof membranes suitably attached to a roof deck.