demo photos from a project where we joined two apartments vertically with a stair case. The photos are mostly sequential and here is the link to the finished product.
Opening in floor from upper level-here you can see the new structure of the opening and the upper level floor thickness
Here is the opening after the new steel structure has been sprayed with fireproofing and the steel “frame” for the stair is being put together.
Now that the opening is properly constructed the custom metal stair goes in.