Roof to Mass

I have a roof I have recieved in Revit and I’d like to convert it to a mass. How do I go about this in Dynamo? Idea is to get the Geometry and use the surfaces to create a mass. Stuck at first hurdle.

This ?

Looks like your geometry does not play well with Dynamo’s geometry engine. Could you try Clockwork’s Element.Geometry+ node to see if at least the Revit geometry is retrieved correctly?