PHS 120 is a high-performance breather membrane used to create a weathertight and windtight external envelope. It provides vapour permeability, extreme watertightness, high nail tear resistance, and thermostability, providing superior condensation protection and extreme resistance to pelting rain at an affordable price. When sealed at the overlaps and other appropriate building components, PHS 120 provides a wind-tight environment underneath, resulting in optimal thermal performance for your insulation.