For single or pair doors.
After finished floor.
Width: Interior opening of the frame + 3-3/4″ (95 mm).
Height: Interior opening of the frame + 1-7/8″ (48 mm). /
Ex.: For a 36″ x 84″ interior opening (914 mm x 2 134 mm)
rough opening should be :
Width, 36″ x 3-3/4″ = 39-3/4″ (1 010 mm)
and Height, 84″ + 1-7/8″ = 85-7/8″ (2 181 mm).