Always remember that your barn door railing system should be at least double the width of your door frame possibly longer if you have an odd shaped door.
Barn door height.
Measure across for the width and from the top of the casing molding to the floor for height.
Add 1 to 2 per door for overlap depending on privacy needs.
72 would probably be even better.
The graphic below simulated a door over the opening.
For instance if you have a doorway that s 35 you ll want a track that s at least 70 although a safe 6ft.
For the door height we recommend measuring from the floor to the top of the casing.
Most barn door sizes fall anywhere between 36 wide on the shorter side by 96 tall on the longer side.
Measure from outside to outside of casing molding.