This construction site was constructed with the entire interior construction prior to moving in. You live in a residential area. In the case of a general glass shot, the middle door was not comfortable to use, so you replaced it with a folding door.

Since furniture, electronics, etc. are already located, it is difficult to proceed with construction in the same way as the entire interior construction. Therefore, the existing shot sheet is not removed, but only the windows and doors are ironed out.

Construction is carried out by inserting the folding door lower rail over the general glass middle door (high shot). Some people are worried that the lower rail jaw will be raised, but the height will remain the same by combining it with the existing lower shot.

As the lower rail construction method does not remove the existing shot sheet, there is no additional cost of removal, and there is no damage to the wallpaper, floorboards, marble, etc., which have already been constructed.The construction method does not require demolition work, and the folding door installation time is fast and this construction method is also called the "one-day construction method".​