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.
Interior barn door opening overlap detail.
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.
Add 1 to 2 per door for overlap depending on privacy needs.
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 across for the width and from the top of the casing molding to the floor for height.
The final option is bypass doors.
In this application the doors overlap and slide over one another so that half of the opening is accessible at any time.
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.
Barn door measuring guide for door openings with casing molding.
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.
First make sure that the header space over the opening can support the weight of the hanging barn door.
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.