The difference in height is insignificant since it adds only 1 4 inch.
What is the rough opening for a 36 bifold door.
As a rule the height of the door opening needs to be 1 1 2 to 2 higher than the height of the door.
The rough opening should be one inch wider than the frame and 3 4 of an inch higher than the door.
The height is 80 which is considered 6 8 or 6 8 add 2 1 2 to the actual door height and frame it 82 1 2 high.
Bifold door slabs need to be shorter and or the openings need to be taller to allow for the hardware.
Now all you need to know is how to properly frame your door rough opening.
Total width for rough opening is 51 1 2 height will be determined by the height of the doors and the desired clearance between the bottom of the doors and the floor.
Typically the rough bifold door opening should be sized 2 inches wider and 2 inches higher than the door itself regardless of the bifold door size.
The minimum overall width of our bifolding doors is 1400mm and the minimum recommended panel width is 700mm therefore any bifold door smaller than 2100mm wide would be limited to a two panels.
For fire rated openings drywall must extend at least 1 2 into frame.
For example a four foot wide 48 by six feet eight inches high 80 bifold set of doors would require a rough opening width of 50 inches and a height of 82 inches.
The rough opening for a 36 inch pre hung door is is 38 5 inches by 82 inches.
A critical issue for bifold door is the hardware at the top and bottom of the door.
A opening width 2 b opening height 1 the rough opening would be 38 x 85 for a 3 0 x 7 0 door frame.
The rough opening for a bifold with jambs is framed slightly wider to allow additional space for a door jamb on three sides.
What is the minimum width for bifold doors.
Door jambs are 3 4 inch thick for a total of 1 1 2 inches including 1 4 inch of space around the perimeter for shimming.
Many bifold doors are designed to fit 80 high openings and allow a half inch clearance at the top and 1 1 2 to 2 at the bottom.