According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than July 27, 2021 by admin Question: According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than A. 20 cm B. 30 cm C. 40 cm D. 75 cm Answer» b. 30 cm Note: The above multiple-choice question is for all general and Competitive Exams in India.