Keyboard ALT + g to toggle grid overlay
Gain interactivity with a view, graphical selection, constraints to sloped faces, and offset to covers in the enhanced Rebar Constraints option. Zoom to the scale that's most useful so that everything is visible and clear when accessing the dialog.
Graphically select the desired constraint so that you can work faster and more efficiently. In Revit 2016, any segment from a shape can be constrained to an inclined face. Easily define the distance between the rebar and covers.