... Membrane 1.Description:In many underground waterproof projects, it requires a special waterproof method—empty-applied. In this situation, develops a new series of ... ,solid,level,dry;no grit,rift and loosing dust. For a large recess,fill it with cement mortar and then level it ... within the scope where membrane is paved.(Plastering cement grout in a large area at one time is not recommended, it’s better ...