In this example the opening width is 32 4.
Outside barn doors dimensions.
Most barn door sizes fall anywhere between 36 wide on the shorter side by 96 tall on the longer side.
Custom sizes for sliding doors.
Using a tape measure begin at the left edge of the opening and measure straight across to the right edge.
For the width of your barn door we recommend at least a 4 overlay.
The width of your opening the height of your opening from the floor to the top of the opening the space between the top of the opening to the ceiling and the width of the right and left walls of your opening.
Generally most standard barn doors are approximately 36 x 84 or 42 x 80 with enough extra lip to overlap most standard door frames 36 x 80 by an inch or so.
If the doorway has moldings measure from outside edge to outside edge to determine the proper door width add about 4 to 6 inches to your measurement.
Total door width will be 36.
Measure across for the width and from the top of the casing molding to the floor for height.
Sliding doors should extend at least an inch beyond the sides of the opening that don t have trim or an inch beyond the moldings of openings with trim.
Add 1 to 2 per door for overlap depending on privacy needs.
Measure from inside to inside of the opening.
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Add 4 to the measurement and you have your recommended door width.
For example if you have a 30 opening you would order at least a 34 barn door.
Barn door measuring guide for door openings with casing molding.
Sheetrocked opening no trim or casing width.
Ideally the door will cover 2 to 3 inches beyond the opening on each side.