The rough opening should be 49 by 82 for a 48-by-80-inch door. This allows for 1/2-inch-thick drywall on both sides and at the top, 80 inches for the doors and hardware, and a 1-to- 1 1/2-inch space under the door.
Can you use 2/24 bifold doors for a 48 opening?
Two-section bifolds are generally sold in widths to fit openings from 24 to 36 inches. ... If an opening is 48 inches wide or wider, two 2-section doors are used to fill it. Trimming, if needed, is the second step in an installation.1987-11-20
How much smaller should a bifold door be than the opening?
The actual dimension of bifold doors is always ½'' smaller in width than the stated size to accommodate the necessary clearance for proper operation of doors. Bifold doors must be 1-1/2'' shorter in height than the finished opening.