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In a preferred embodiment, a membrane for use as an underlayment includes a basemat, which includes at least three plies, a ply of a meltblown polymer sandwiched between two plies of spunbond polymer; and a flexible coating applied to the basemat, the coating having a cementitious hydraulic componen

In a preferred embodiment, a membrane for use as an underlayment includes a basemat, which includes at least three plies, a ply of a meltblown polymer sandwiched between two plies of spunbond polymer; and a flexible coating applied to the basemat, the coating having a cementitious hydraulic component, a polymer comprising a water-soluble, film-forming polymer; and water. The finished membrane is flexible. Another embodiment for an underlayment for use underneath ceramic tiles includes a basemat and a coating of a set hydraulic component less than ⅛″ inches thick. A method of making the flexible membrane includes assembling components including a hydraulic component, a water-soluble, film-forming polymer and water, then mixing them to form a coating. A basemat is provided onto which the coating is applied over a flexible surface or no surface. After coating at least one face of the basemat, the coating is dried to form the membrane.

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1. A flexible membrane in rolled form comprising: a basemat in rolled form having at least three plies comprising a center ply of a meltblown polymer and two outer plies of spunbond polymer, wherein said center ply is impervious to a hydraulic composition slurry comprising, by weight percent, 66.8%

1. A flexible membrane in rolled form comprising: a basemat in rolled form having at least three plies comprising a center ply of a meltblown polymer and two outer plies of spunbond polymer, wherein said center ply is impervious to a hydraulic composition slurry comprising, by weight percent, 66.8% Class C fly ash, 32.8% acrylic polymer latex, 0.30% polycarboxylate superplasticizer, and 0.13% colorant; anda set and dried flexible coating on one side of said basemat, said coating comprising: 40% to 80% of a hydraulic component comprising about 62% to about 67% Class C fly ash by weight; andabout 15% to about 35% of a water-soluble, film-forming acrylic polymer on a dry solids basis, wherein said coating is characterized by having a set and dry time of approximately 10 minutes in a 175° F. (80° C.) oven and wherein said coating is obtained by drying the flexible membrane in an oven;wherein said membrane is less than 3 mm thick and is rollable into a cylinder. 2. A tile underlayment membrane, wherein the membrane is flexible and comprises: a basemat having at least three plies comprising a center ply of a meltblown polymer and two outer plies of a spunbond polymer, wherein said center ply is impervious to a coating slurry prepared by mixing a water-soluble, film-forming polymer and a hydraulic component in water; anda flexible, set and hardened coating on one side of said basemat, said coating comprising: 40% to 80% of a hydraulic component comprisingabout 62% to about 67% Class C fly ash by weight;a plasticizer selected from the group consisting of a polycarboxylate, sulfonated melamine and sulfonated naphtalene; andabout 15% to about 35%a film-forming acrylic polymer on a dry solid basis, wherein the acrylic polymer has polymerized and hardened on the basemat and wherein the polymer and Class C fly ash are intertwined in each other and have formed strong links; andwherein the flexible tile underlayment membrane is set and hardened. 3. The tile underlayment membrane of claim 2, wherein the membrane is set and hardened and the polymer is polymerized and hardened by exposure to heat. 4. The tile underlayment membrane of claim 2, wherein the membrane is set and hardened and the polymer is polymerized and hardened by exposure to heat in an oven. 5. The tile underlayment membrane of claim 2, wherein the membrane is set and hardened and the polymer is polymerized and hardened by exposure to heat in an oven at about 175° F. (80° C.). 6. The tile underlayment membrane of claim 5, wherein the membrane is set and hardened and the polymer is polymerized and hardened by exposure to heat in an oven at about 175° F. (80° C.) for approximately 10 minutes. 7. The tile underlayment membrane of claim 2, wherein the membrane is less than 3 mm thick. 8. The tile underlayment membrane of claim 2, wherein the membrane is in rolled form. 9. The tile underlayment membrane of claim 2, wherein the coating was prepared from a slurry to which the acrylic polymer was supplied as acrylic polymer latex. 10. The tile underlayment membrane of claim 2, wherein the coating was prepared from a slurry to which the acrylic polymer was supplied as about 15% to 17% acrylic polymer latex on a dry solids base. 11. The tile underlayment membrane of claim 2, wherein the polymer is a methyl methacrylate copolymer of acrylic acid and butyl acetate.