Single barn door hardware kits allow the door to be pushed to one side of the doorway when opening. They are used for narrow openings (typically less than 60" wide), and require sufficient clearance on one side of the doorway. This is the simplest installation and requires the least amount of overhead clearance.
Double barn door hardware kits allow the doors to meet in the middle of the doorway and open to each side of the doorway in a bi-part configuration. They are typically used for wider openings that have sufficient clearance (one door width) on both sides of the doorway. If you don't have sufficient clearance on both sides, then a bypass hardware kit will be required.
Standard configuration, one door on each track. Both door stack flush on top of each other when in the open position.
A third door is added to the standard configuration. Two doors on the back track and the 3rd door on the front track. The two doors on the same track do not bypass each other.
Two doors on each track. The two outer doors overlap the inner doors when in the closed position. Both sets of doors stack flush on top of each other when in the open position. Typically used for wide doorways or for dividing rooms.
Standard two-door configuration. Simplest installation and least overhead clearance required.
Two "inside doors" and one bypass door. Typically used for wider doorways when there is insufficient overhead clearance for a dual-track bypass.
Two "inside doors" and two bypass doors. Each set of doors is pushed to its respective side when opening the doors. Used for wide entryways or to divide a room.
This is an excellent option for closing off wide entryways with minimal clearance on either side of the doorway. When in the open position, all three doors will "stack" on top of each other to one side of the doorway. As a result, the access to the doorway is maximized.