Liquid roof Blockade is a one-component polyurethane composition, turning into a result, curing in a durable and flexible seamless membrane. Waterproofing that is resistant to abrasive substances, has a high heat capacity and vapor permeability eliminates cracking when exposed to high and low temperatures, UV resistant, can be used as corrosion protection and to form a seamless membrane on any area. The composition is designed to meet the challenges of the external waterproofing of construction industrial, commercial and civil purposes. The material is also effectively used both in new construction and in reconstruction of existing buildings and structures.