The difference between External and Internal reinforcement is that one mesh will be placed with cover defined from the External side of the wall and the other from the Internal side of the wall. Other settings are the same.
Create Rebar – select if you want to create selected rebar.
Rebar bar type – select Rebar Type.
Spacing/Step – define distance between rebar.
Rebar Hook Type Start/End - choose hook type for rebar
Hook Rotation At Start - parameter to rotate hook direction. Available in Revit 2021 and above.
Major Rebar – select which one will be near the wall face: Vertical or Horizontal rebar.
Cover – cover from External/Internal wall face.
Vertical Rebar Top/Bottom Offset – offset from wall edges for vertical rebar.
Horizontal Rebar Start/End Offset – offset from wall edges for horizontal rebar.
NOTE: you can use negative values for offsets to extend bars outside wall boundary.