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.
Outside barn doors dimensions.
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.
Measure from outside to outside of casing molding.
Barn door measuring guide for door openings with casing molding.
Measure from inside to inside of the opening.
For the width of your barn door we recommend at least a 4 overlay.
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.
Sheetrocked opening no trim or casing width.
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.
Most barn door sizes fall anywhere between 36 wide on the shorter side by 96 tall on the longer side.
Using a tape measure begin at the left edge of the opening and measure straight across to the right edge.
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Total door width will be 36.
To determine the door width add at least two inches to the width of the opening or to the outside dimensions of the door trim.
Add 4 to the measurement and you have your recommended door width.
In this example the opening width is 32 4.
Ideally the door will cover 2 to 3 inches beyond the opening on each side.
For example if you have a 30 opening you would order at least a 34 barn door.
Add 1 to 2 per door for overlap depending on privacy needs.
Measure across for the width and from the top of the casing molding to the floor for height.