To have privacy the door usually overlaps the opening by an inch so that a 2 6 opening will require a 2 8 door.
Interior barn door opening overlap detail.
You will cut your slats exactly the height of your opening minus whatever clearance you want the door to have above the floor i wanted mine to have 1 2 inch between the floor and the door.
Barn door measuring guide for door openings with casing molding.
The final option is bypass doors.
Add 1 to 2 per door for overlap depending on privacy needs.
The determining factor in how high or how wide you want to go is just how much you want your sliding door to overlap with the opening.
This means on one side of the door opening or the other there should be at least 2 8 and perhaps a little more to ensure all the hardware can fit properly.
Your door s width should be 2 to 3 inches wider than the door opening and 1 inch higher than the dimensions of your opening.
Measure across for the width and from the top of the casing molding to the floor for height.
This application is great for areas where barn doors are desired but there isn t adequate room on either side of the opening for the door to slide.
Measure from outside to outside of casing molding.
In this application the doors overlap and slide over one another so that half of the opening is accessible at any time.