Our sizes are measured from outside of jamb to the outside of the jamb. For example, a 144” x 96” bi-fold door listed on our website means that 144” is the width from outside to outside of jamb (not the actual width size of the door) and 96” is the height from outside of jamb to bottom of our built in steel threshold (not the actual height of the door).
We recommend the rough opening of the WIDTH to be 1” to 2” wider than the door size ordered to give the installer enough room to comfortably position the jamb into place and have enough room to make sure the jamb is leveled.
We recommend the rough opening of the HEIGHT to be 1/2” to 1” taller than the door size ordered to give the installer enough room to comfortably position the jamb into place and have enough room to make sure the jamb is leveled.
Top track of our bi-fold doors takes up approximately 6 1/2” of the total height opening space. This means that the total height opening space of your bi-fold door is the height size listed on our website minus the threshold & 6 1/2” for the top track.
The bifold door will stick out (1) one panel length when it is fully opened and resting to one side