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A window or door flashing or roofing material, containing no asphalt, either mechanically fastened or self-adhering comprising a mixture of: one or more ethylene based elastomers having a melting point below 160° F., in an amount of 10-40% based on the total weight of the product; one or more semi-c

A window or door flashing or roofing material, containing no asphalt, either mechanically fastened or self-adhering comprising a mixture of: one or more ethylene based elastomers having a melting point below 160° F., in an amount of 10-40% based on the total weight of the product; one or more semi-crystalline, non-elastomer alpha olefin-based polymers having a melting point above 160° F. in an amount of about 10-40% based on the total weight of the product; and a rubber fraction of ground, vulcanized rubber having a size up to about 18 mesh, US Sieve Series, in an amount of about 10% to about 75%, based on the total weight of the product.

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1. A dimensionally-stable polyolefin based sheet product comprising a combination of a), b) and c), as follows: a) one or more semi-crystalline, ethylene-based elastomeric resins having a melting point below about 160° F.;b) a semi-crystalline, non-elastomeric alpha-olefin-based resin with a melting

1. A dimensionally-stable polyolefin based sheet product comprising a combination of a), b) and c), as follows: a) one or more semi-crystalline, ethylene-based elastomeric resins having a melting point below about 160° F.;b) a semi-crystalline, non-elastomeric alpha-olefin-based resin with a melting point greater than 268° F.; andc) a ground, vulcanized rubber fraction, obtained from recycled rubber, ground or recycled into particles having a size up to about 18 mesh homogenously mixed together and formed into a sheet material having upper and lower major surfaces;wherein the amounts are as follows:a) an amount greater than 60% by weight based on the total weight of a) and b);b) an amount of 4 wt. % to 30 wt. %, based on the total weight of a), b), and c); andc) an amount of 50 wt. % to 80 wt. % based on the weight of the total amount of components a), b), and c); andd) a woven or nonwoven reinforcing scrim with a melting point higher than about 300° F. adhered to an upper and/or lower major surface of said sheet material. 2. The sheet product of claim 1 wherein the ethylene-based elastomeric resin is a metallocene catalyzed copolymer having the chemical formula: wherein R is an alkyl group, straight chain or branched, having from 5 to about 20 carbon atoms extending from one or more of the n units, and wherein the sum of the m+n units is between 4 and about 400. 3. The sheet product of claim 1, wherein the ethylene-based elastomeric resin has a melt flow index is in the range of 0.1 dg/min to 5 dg/min as measured at 374° F. and 2.16 Kg, according to ASTM D-1238, and wherein the amount of b) is less than 40% by weight, based on the weight of b) plus c). 4. The sheet product of claim 2, wherein the metallocene catalyzed elastomeric resin is an ethylene-octene copolymer having a density less than about 0.9 g/cc in an amount greater than 60% by weight of elastomeric plus the non-elastomeric resins of claim 1. 5. The sheet product of claim 2, wherein the metallocene catalyzed elastomeric resin is an ethylene-butene copolymer having a density less than about 0.885 g/cc in an amount greater than 60% by weight of the elastomeric plus the non-elastomeric resins. 6. The sheet product of claim 2, wherein the metallocene catalyzed elastomeric resin is an ethylene-hexene copolymer having a density less than about 0.883 g/cc in an amount greater than 60% by weight of the elastomeric plus the non-elastomeric resins. 7. The sheet product of claim 3, wherein the ground vulcanized rubber fraction is 50-65 wt. % based on the total weight of a) plus b), plus c). 8. The sheet product of claim 3, wherein the elastomeric resin is post-consumer recycle material. 9. The sheet product of claim 3, wherein the elastomeric resin is post-industrial recycle material. 10. The sheet product of claim 1 wherein the semi-crystalline alpha-olefin-based resin is a polypropylene homopolymer or a polypropylene copolymer having a density between 0.89 and 0.91 g/cc. 11. The sheet product of claim 1, wherein the semi-crystalline alpha-olefin-based resin has a melt flow index is in the range of 2 dg/min to 25 dg/min as measured at 446° F. and 2.16 Kg, according to ASTM D-1238. 12. The sheet product of claim 1, wherein, the ethylene-based elastomeric resin is contained in the sheet material in an amount less than 40% by weight, based on the total weight of b) and c). 13. The sheet product of claim 11, wherein the ethylene-based elastomeric resin is post-consumer recycle material. 14. The sheet product of claim 11, wherein the ethylene-based elastomeric is post-industrial recycle material. 15. The sheet product of claim 11, wherein the semi-crystalline alpha-olefin-based resin has a melting point above 320° F. that is contained in the sheet product in an amount of about 40% or less by weight of the elastomeric plus the non-elastomeric resins of claim 1. 16. The sheet product of claim 1, wherein the reinforcing scrim has a melting point of at least 380° F. 17. The sheet product of claim 1 having a total thickness from about 0.025 inches to about 0.5 inches. 18. The sheet product of claim 1 further including a secondary elastomeric resin selected from the group consisting of attactic polypropylene; ethylene-propylene copolymer; ethylene-co-vinyl acetate; a terpolymer of ethylene, propylene, and a nonconjugated diene; a mixed polymer of ethylene and vinyl acetate; a mixed polymer of ethylene and methacrylate; a thermoplastic urethane; a thermosplastic vulcanizate; a thermoplastic polyester; a styrene-butadiene mixed polymer; chlorinated polyethylene; nitrile rubber (NBR); and a combination thereof in an amount less than 15% of the total weight of the ethylene-based elastomeric resin plus the non-elastomeric resin. 19. The sheet product of claim 1 further including an adhesive coating. 20. The sheet product of claim 19 wherein the adhesive is applied to the major surface of the sheet material and is protected with a contacting release sheet. 21. The sheet product of claim 1, further including an infrared coating or a heat reflective coating. 22. The sheet product of claim 1, further including a visible light reflective coating. 23. The sheet product of claim 1, further including a flame retardant coating. 24. The sheet product of claim 1, further including a coating of a slip-resistant material. 25. The sheet product of claim 1 further including an organic or inorganic filler selected from the group consisting of calcium carbonate, talc dust, wood dust, mica, glass, and a combination thereof in an amount of about 5% to about 60% based on the total weight of the sheet product. 26. The sheet product of claim 1, wherein the ground rubber fraction is selected from the group consisting of EPDM; cryogenically ground EPDM; butyl; neoprene; and combinations thereof. 27. The sheet product of claim 26, wherein the ground, vulcanized rubber has a size less than about 0.040 inches. 28. The sheet product of claim 27, wherein the vulcanized rubber has a size from about 0.003 inches to about 0.020 inches. 29. The sheet product of claim 1 wherein the ground, vulcanized rubber is crumb rubber obtained from tires. 30. The sheet product of claim 29 wherein the crumb rubber is obtained from tire treads that are free of metal. 31. The sheet product of claim 1 further including a plasticizer. 32. The sheet product of claim 31, wherein the plasticizer is a processing oil selected from the group consisting of paraffinic processing oil; paraffinic processing oil and stearic acid; aromatic processing oil; naphthenic processing oil; and a combination thereof. 33. The sheet product of claim 31, wherein the plasticizer is included in an amount from about 1% to about 15% by total weight of the sheet product. 34. The sheet product of claim 1, wherein the reinforcing scrim is a woven or nonwoven textile having a weight of about 0.3 oz/yd2 to about 8 oz/yd2 at a thickness of about 0.003 to 0.026 inches. 35. The sheet product of claim 34, wherein the textile is a spun bond nonwoven textile containing a thermoplastic selected from the group consisting of a polyester; a polyamide; a polycarbonate; a polyphenylenesulfide; a polyarylether; an ultrahigh molecular weight polyethylene; a syndiotactic polystyrene; polyvinylidene fluoride; polytetrafluoroethylene; and a combination thereof. 36. The sheet product of claim 34 wherein the nonwoven textile is a spun bond polyester with a melting point greater than 490° F. 37. The sheet product of claim 34, wherein, the nonwoven textile includes fibers that have a melting point of 300° F. and higher. 38. The sheet product of claim 1, wherein the sheet product is textured on an outer surface to provide a non-slip surface. 39. The sheet product of claim 1, wherein the product has been subjected to a thermal annealing process. 40. A method of waterproofing a building roof comprising applying the sheet product of claim 1 onto the building roof. 41. The method of claim 40, wherein the sheet product is applied to the roof as a material selected from the group consisting of a roofing base sheet; a roofing ply sheet; a roofing underlayment; and a combination thereof. 42. A method of waterproofing a tunnel comprising disposing the sheet product of claim 1 between a water source and an interior of the tunnel. 43. A method of waterproofing a window or door periphery comprising disposing the sheet product of claim 1 between the window or door and a framing member adjacent to the window or door. 44. A method of lining a pond or landfill comprising disposing the sheet product of claim 1 onto a floor of the pond or landfill. 45. A method of constructing a building comprising disposing the sheet material of claim 1 onto the building floor. 46. The sheet product of claim 1 that is physically attached to another layer of sheet material.