Section 35(3) in The Haryana New Mandi Townships Building Rules, 1967
(3)A wall shall be deemed to be divided into distinct lengths by -(a)return walls, which are external walls, party walls or cross walls provided they are of a height equal to the height of the walls so deemed to be divided and of thickness required under these rules;(b)by piers, provided they are of height equal to the height of the wall and of a breadth not less than twice the thickness of the wall so deemed to be divided and projecting on each side of the wall up to a distance not less than the thickness of the wall; or by piers of such other dimension and height as will give not less strength and stability.
