Section 76(2)(a) in Rajasthan Factories Rules, 1951
(a)The building shall be soundly constructed and all the walls and roof shall be of suitable heat resisting materials and shall be water-proof. The floor and walls to a height of [one metre] [Substituted by No. 1. dated 24.3.1979.] shall be so laid or finished as to provide a smooth, hard and impervious surface.