13. Quality of grounds and floors: Grounds and floors where foundry operations are performed shall be firm and without irregularities. They shall be made of earth or of non-combustible materials, with the exception of the wooden block floors especially treated for this purpose. These floors shall be constantly clear of obstacles and cleaned as often as necessary.
R.R.Q., 1981, c. S-2.1, r. 20, s. 13.