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Why are holes sometimes present in the base plates connected to footings?

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.


This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

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