First make sure that the header space over the opening can support the weight of the hanging barn door.
Interior barn door opening overlap detail.
There must be a support beam or strong studs in place on which to anchor the sliding track and there should be ample space between the top of the opening and the ceiling to install the track.
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.
The final option is bypass doors.
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.
In this application the doors overlap and slide over one another so that half of the opening is accessible at any time.
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.
Barn door measuring guide for door openings with casing molding.
Add 1 to 2 per door for overlap depending on privacy needs.
If you want it to completely cover your overhead door trim you ll have to measure from the top of that down instead of just inside the door.