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The vapor barrier prevents moisture in the soil below the ground from entering the brick wall. It can slow down the discharge rate of indoor water vapor to the insulation layer, and effectively prevent the formation of condensation, so that the waterproof vapor-permeable membrane can effectively discharge the moisture of the insulation layer quickly, and protect the thermal performance of the maintenance structure, thereby achieving the purpose of saving energy. Most importantly, the vapor barrier can prevent the underground moisture from rising along the wall and the erosion of the surface wall.