Section 41(3) in The Haryana New Mandi Townships Building Rules, 1967
(3)The intermediate part of the wall between the base and 5 metres (16.404 feet) below the top shall be built so as to fill at least the space between straight lines (drawn on each side of the wall) joining the thickness at the base to the thickness immediately below 5 metres (16.404 feet) from the top.
