I'm considering placing my schach support beams on an angle and just letting the shlock roll up and down the stairs. It would seem to give a tarp shlock considerably more support and avoid sagging. Has anyone ever tried this? Also, if I place the schach mats on a slope and put several layers of schach, shouldn't that keep all but the strongest rains out? Presumably the rain will just roll down the schach.... thoughts?
I'm not sure if I.understand you correctly, here's what I do and you can see if it helps.
I have all my succa walls on a slant (which means the schach beams and schach is as well.) This allows the water to flow down the succa (I'm obviously talking with a tarp.) I don't use the incline to role the tarp up and down, so there's no need for a crazy slope, a good few inches throughout the succa is plenty. I wouldn't advise a big slant as I find it allows the wind to come under, and the schach to bunch etc unless your willing to tie down in which case I have no experience. Just remember, for water to flow and not bunch up in one place, there's a need for a slight slant, hard surface (the schach in my case) and most of all a tight tight tarp.