How to change the slope of roof / floor

[khaled.almunla]

Hi all,
As per the title, how can I change the slope of floor or a roof that exist in the Revit file (whether it was generated by GH or manually), I tried using inspect Element + set Element parameter combination but didn’t work, Slope is a read only parameter.
For context, I had to create the floor element from a boundary in Rhino passed into GH then to Revit. the floor had to be Horizontal then I tried to change the slope. it there’s a better way I’d love some pointers. I also checked for similar threads and didn’t find, if there’s any I’ll check them and delete this one.

Thanks…

[Rickson]

Khaled, I think its problematic due to the slope having to be set first to one of the construction lines before its available as a parameter.