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The surface of footings is normally quite rough so that some leveling has to be carried out for the base plates. The interface between the base plates and footings after leveling is subsequently filled with grout.
During grouting, trapping of air may occur at the underside of base plates and this leads to the formation of cavities and uneven contact surfaces on which the base plates are rested. As such, some holes may be drilled in the base plate to avoid the occurrence of air trapping.