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An asphalt coated structural article comprises a substrate having an ionic charge coated on one side with a layer of asphaltic material and coated on the other side with a coating having essentially the same ionic charge as the substrate. The present invention is a waterproofing barrier which may be

An asphalt coated structural article comprises a substrate having an ionic charge coated on one side with a layer of asphaltic material and coated on the other side with a coating having essentially the same ionic charge as the substrate. The present invention is a waterproofing barrier which may be used as a roofing underlayment for concrete files or to waterproof the basement walls of a building structure.

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1. A roofing assembly comprising:(a) a roof deck; (b) a roofing underlayment installed on said roof deck wherein said underlayment comprises a substrate having an ionic charge that is coated on substantially all of one side with a first coating consisting essentially of asphaltic material and that i

1. A roofing assembly comprising:(a) a roof deck; (b) a roofing underlayment installed on said roof deck wherein said underlayment comprises a substrate having an ionic charge that is coated on substantially all of one side with a first coating consisting essentially of asphaltic material and that is coated on the other side with a second coating having essentially the same ionic charge as the substrate, wherein said second coating consists essentially of a filler material and a binder material, wherein said binder material bonds the filler material together and to the substrate, wherein said second coating does not bleed through said substrate and wherein said underlayment is installed on said roof deck with said asphaltic material contacting said deck; and (c) concrete tiles installed on top of said underlayment.