Yes I wish I would have put rigid foam underneath but I did not. To the bottom of the floor joists supporting the second story from the concrete floor is a bit over 10 feet. I guess I could place EPS foam on the floor (they have some that support 40 or 60 psi. I could pour concrete over that or put wooden floor joist in and add the rigid foam between the joists. Kind of like tall sleepers. I have two standard entry doors but it would not be hard to remove them and change the opening. The stairwell would be a problem unless I made the new floor at finish the same height as the first step. It would be even with it and effectively gone but then all the steps would be of uniform height. It is a steel stairway.
I am really open to all suggestions. Will have to see what they require. Maybe rafters on the floor may be the way to go. The floor would then be insulated. Maybe some room for duct work or lines depending on which was the rafters would be ran. If so if one isolated the joists with a moisture barrier could FPS wood be used or treated.
I like this site. A lot of minds with ideas and experience.
