I feel for you! My floor in my sewing room collapsed! It was an old, added-on room and DH says that they did not do a very good job when they added it on evidently, years before we bought it. They had to take up the whole floor, clear down to the dirt. There were a couple of concrete steps to show that it was probably a porch at one time. I still have not gotten my sewing room back because, after the floor was fixed, our adult son got a divorce and had to come and live with us.