A new concept wall system is provided, wherein the Exterior Insulation and Finish System cladding is created using components with no water absorption, a very low vapor permeability and sealing properties, accommodated with an installation technology which extend the materials properties to the assembly, together with bonding and sealing the intersections and terminations, creating a Non-Permissive to water and vapor diffusion, Exterior Insulation and Finish System (NP-EIFS). The present invention relates to an EIFS cladding having two air and vapor barriers, one applied to the substrate, a continuous liquid membrane with sheathing joints sealed to be moisture barrier for inside vapors, and an exterior weather and vapor barrier which is created using closed cell extruded polystyrene insulation boards, special assembled with joints sealed, to create a non-permissive insulation envelope of the enclosure. Another object of the invention is to provide waterproof and air/vapor-proof details, a new concept of flashing and sealant application around windows/doors and other constructive elements to avoid thermal bridges and air leakage inside thermal envelope and wall assembly. Methods of installation are included.