Section 244(3)(ii) in The Building And Other Construction Workers '(Regulation Of Employment And Conditions Of Service) Central Rules, 1998
(ii)the floor of such canteen shall be made of smooth and impervious material and inside walls of such canteen shall be lime-washed or colour-washed at least once in every six months: Provided that such inside walls of the kitchen of such canteen shall be lime-washed once in every three months.