Backstop NT-VB is a flexible, polymer-based, non-cementitious, water-resistive barrier, that when properly installed prevents water penetration, eliminates air infiltration and retards vapour diffusion. Backstop NT-VB used with AquaFlash™ and AquaFlash Mesh, provides an effective water-resistive, vapour-retardant protective membrane for exterior rated sheathings and other approved substrates. Backstop NT-VB has been engineered to be versatile and easy to apply. Backstop NT-VB is also approved for use behind ALL cladding types (See DSC 268 for more details on using Backstop NT-VB and AquaFlash behind claddings other than EIFS.)