For the door height we recommend measuring from the floor to the top of the opening.
Barn door distance from floor.
When the door is hung the center of the door width will line up with the track above.
Ideally the door will cover 2 to 3 inches beyond the opening on each side.
That depends on the thickness of your barn door.
The center of the rail will mount 2 above the door 3 above the opening which will be close to the center of 2 8 blocking.
Measure from the header to the floor to determine the door length you need.
Again for doorways with moldings measure from the top edge.
If your barn door is 1 5 thick then you would have 1 between wall and door.
In this example the total height is 80 once mounted the door will hang 1 off the floor which will add the bit of coverage you need at the top of the opening.
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Once you ve established your desired door size.
To figure out what size track you need double your final width measurement.