Use common sketch tools to define the boundaries for a system of rebar covering an area.
Sketch area reinforcement in floors, walls or foundation slabs for large areas that need reinforcement.
 Reinforcement panel
Reinforcement panel
 (Area).
 (Area).  Draw panel
Draw panel
 (Rebar Line).
 (Rebar Line). 
A parallel line symbol indicates the major direction edge of the area reinforcement.
 Mode panel
Mode panel
 (Finish Edit Mode).
 (Finish Edit Mode). 
Revit places an area reinforcement symbol and tag on the completed sketch at the center of the area reinforcement.