PU Grouting and PU injection Waterproofing Services Grouting is a procedure by means of which grout is injected into different kinds of cavity spaces cracks, conduits and caves, air/water pocket. It has a wide application modern civil engineering, especially in Rcc cavity and capillary track. In most of cases the ingredients for the preparation of mortars and grouting suspensions are soil stabilizers , epoxy, acrylic, siloxane polyurethane additive fillers, grouting penetrates voids in a mass, replacing water or air pocket between grain particles by high pressure to prevent fracturing then stiffens the mass as a whole, if a inorganic grout it used , it must be thoroughly mixed with high shear mixer In practice the composition of grouting suspension is not standardized.