This school building was manufactured in Belgium in the late 1800s and brought to Costa Rica as a numbered kit building. Each piece of the building is numbered and was assembled like a lego kit. It is made entirely of steel with no insulation and no thickness to the walls. It’s like a numbered ship kit except this one has been here for over one hundred years.
Every building part is numbered.
Don’t install a part #II where a part #III should be.
No insulation on the thin metal walls.