bindiyadoss

This is my first post here. I just put in a bid to do the window cleaning on 62 condos. If I get it, the only way I can get to some of the windows is to take a ladder up to the first floor sloped roof, and then climb that ladder to get to the windows. The problem is that the roof the ladder will be on is slightly sloped. It is not steep, but I'm not completely sure the ladder would not slip. I tried putting the ladder up and going up a few rungs to see if it was stable. It seemed to be fine, but you never know what can happen. Have you guys ever had a situation like this? Do you know any tricks or tips I can use to make sure the ladder won't slip? I have the pivot tool, and I could put that at the base of the ladder, but I'm not sure that would hold it. Anyways, I appreciate any help!