For single or pair doors.
After finished floor.
Width: Interior opening of the frame + 2-3/4″ (70 mm).
Height: Interior opening of the frame + 1-3/8″ (35 mm). /
Ex.: For a 36″ x 84″ interior opening (914 mm x 2 134 mm)
rough opening should be :
Width, 36″ x 2-3/4″ = 38-3/4″ (984 mm)
and Height, 84″ + 1-3/8″ = 85-3/8″ (2 169 mm).