Again for doorways with moldings measure from the top edge.
Barn door rough opening height.
For door openings with casing molding.
Measure across for the width and from the top of the casing molding to the floor for height.
Measure from outside to outside of casing molding.
In this example the total height is 80 once mounted the door will hang 1 off the floor which will add the bit of coverage you need at the top of the opening.
Ideally the door will cover 2 to 3 inches beyond the opening on each side.
30 opening 34 wide door.
To start measure the width of your door opening from outside molding edge to outside molding edge and add 1 inch or more on each side for overlap.
A 4 foot wide door takes at least 8 feet of track to slide completely open.
Measure from the header to the floor to determine the door length you need.
To figure out what size track you need double your final width measurement.
Standard barn door sizes most barn door sizes fall anywhere between 36 wide on the shorter side by 96 tall on the longer side.
Measure the height of your door opening from the top molding edge to floor.
For example a 4 foot door will cover a 3 foot opening with 6 inches on either side reducing the gaps.
For a sheet rocked opening we recommend the door height be 1 2 larger than the opening.
For the door height we recommend measuring from the floor to the top of the opening.
Barn door measuring guide.
The standard height of the rough opening for a door is the door height plus 2 5 8 inches.
You should add 2 1 2 to the height of the actual door.
Getting the rough opening size right the first time will save you from frustration when installing your doors.
The additional room allows for a 3 4 inch top jamb a shim.
The height of common doors is 6 feet 8 inches.
Once hung the door will be another 1 2 off the floor for a total coverage above the door of 1.
Just add 2 to the width of the actual door size.
Once you ve established your desired door size.
For complete coverage and to minimize the gaps make sure the door is at least several inches wider than the opening.
The height is a bit trickier based on the casing and header.
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.
Next you ll want to determine the height you want your door to be.
Framing rough opening sizes are really quite simple.
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.