36 Bifold Door Rough Opening

If the opening does have trim installed subtract 3 4 inches.
36 bifold door rough opening. The maximum allowable deviation is 1 8 to 1 4. Maximum allowable deviation from square is normally 1 4. A critical issue for bifold door is the hardware at the top and bottom of the door.
Bi folding internal doors are favoured by those in smaller houses or apartments where opening a standard width door removes a lot of possibilities. 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. A 30 door is undersized and so will fit in a finished 30 opening.
Subtract 2 inches from the height of the opening to determine the height of the door if the opening does not yet have trim installed. 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. Verify the rough opening is square.
Bi fold doors need a finished opening of the size they are. Minimum double studs should be used at all rough openings. Buy online collect in hundreds of stores in as little as 1 minute.
Verify the rough opening is level and plumb. 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. If you are going to have 1 2 sheetrock jambs then you should frame.
The rough opening sill must not be crowned or sagged. The diagonal measurements should be the same. Allowing for bifold door hardware.