Roof assembly that slopes downwards in 2 directions, HELP!

[alimr95]

Hello everyone,
I'm currently working on a project where the roof of the building acts as a structure for a bridge above. The slab slopes downwards toward the retaining wall in the back but also the top layer of the roof sandwich thickens to allow the road above to be straight; however, according to the survey done on the site, that top layer road does slope in the other direction. I know that Revit does now allow floor or roof elements to have variable thicknesses downwards and only allows you to modify sub-elements of the roof/floor upwards. I managed to create this by making 1 roof element that just slopes downwards in the red direction and attached a roof fascia that I created from a profile. I still need that top layer to slope downwards in the blue direction. My boss wants that roof to be done accurately so he can take accurate sections at different locations in the building. Any help would be appreciated. For context, I also attached a screenshot of the model.
Thanks,

[mphungDCHNW]

You can always model in place a roof then do a void extrusions on the angles you want 

[barthbradley]

You mean a layer with variable thickness?

Make that Roof Layer "Variable" and shape edit the Roof with Modify Sub-Element Tools.  

NOTE: Modify Sub-Elements only works with a flat (e.g. no slope) roof/floor.  

[ToanDN]

You will need two roofs.

- Roof 1 for the base with a defined slope

- Roof 2 for the top is flat with modified sub-elements

- Overlap and join them with the Join order prioritizing Roof 1