Article R4216-12 of the French Labour Code
The steps must comply with the following requirements: 1° They must not be slippery; 2° If there is no riser, successive steps must overlap by 5 centimetres; 3° It is forbidden to place one or two isolated steps in the main passageways; 4° The dimensions of staircase steps must comply with good practice; 5° There must be no more than 25 steps in each flight; 6° Landings are the same…