Below grade, blind side, dual waterproofing membrane assembly incorporating a bentonite sheet waterproofing membrane, and a sheet membrane with adhesive to fully bond to concrete/shotcrete, and a method of making, and using same

A dual waterproofing membrane assembly system for a structure, comprising:

• (a) at least one soil retention system having a first face and a second face, and wherein said first face faces compacted earth or soil;
• (b) at least one bentonite sheet waterproofing membrane layer having a first face and a second face, and wherein at least a portion of said first face of said at least one bentonite sheet waterproofing membrane layer is secured to at least a portion of said second face of said at least one soil retention system, and said at least one bentonite sheet waterproofing membrane layer is composed of a layer of a first material;
• (c) at least one waterproof sheet membrane layer having a first face and a second face, said at least one waterproof sheet membrane layer is composed of a layer of a second material, and wherein said second face of said at least one waterproof sheet membrane layer has at least one layer of at least one adhesive, and wherein at least a portion of said first face of said at least one waterproof sheet membrane layer is secured to at least a portion of said second face of said at least one bentonite sheet waterproofing membrane layer;
• (d) at least one layer of concrete or shotcrete having a first face and a second face, and wherein at least a portion of said first face of said at least one layer of concrete or shotcrete is secured to at least a portion of said at least one layer of at least one adhesive, so as to form said dual waterproofing membrane assembly system for a structure;
• and
• (e) wherein said first material is different than said second material.

A method of providing a dual waterproofing membrane assembly system for a structure, comprising the steps of:

• (a) forming at least one soil retention system having a first face and a second face, and wherein said first face faces compacted earth or soil;
• (b) securing at least one bentonite sheet waterproofing membrane layer membrane having a first face and a second face, to at least a portion of said at least one soil retention system, such that said first face of said at least one bentonite sheet waterproofing membrane layer is secured to at least a portion for said second face of said at least one soil retention system, and said at least one bentonite sheet waterproofing membrane layer is composed of a layer of a first material;
• (c) securing a layer of a second material composed of at least one waterproof sheet membrane layer having a first face and a second face, and having at least one layer of at least one adhesive on said second face of said at least one waterproof sheet membrane layer, to at least a portion of said at least one bentonite sheet waterproofing membrane layer, such that said first face of said at least one waterproof sheet membrane layer is secured to at least a portion of said second face of said at least one bentonite sheet waterproofing membrane layer, so as to form said dual waterproofing membrane assembly system for a structure;
• and
• (d) wherein said first material is different than said second material.