If the risk can not be managed don't do it
Several years ago I used to clean the inside of one of the local Kwik saves..
After a refit took my ladders inside as usual, put them up... though they didn't look right but thought it must be me as I had done this many times before, As I went up the ladder they went from under me, Ooouch dead lucky I was (they had raised the floor level during the refit) inside laddders no more for me unless I have some one footing them..